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CCNA练习题答案

来源：意榕旅游网

测试一

问题 1 给定二进制值11000001。它等于十进制的193。正确答案：对

问题 2 如果路由器有一个需要其路由的分组，但是路由器在其路由选择表中不能找到目的网络号，路由器将会丢弃此分组。正确答案：对

问题 3 下面哪些中继方式是Cisco专有的？正确答案： B. 802.1

D. ISL

问题 4 哪个拓扑描述的是设备之间如何通信的? 正确答案： B. 逻辑

问题 5 哪个是一种为一个公司到其他业务伙伴之间提供安全连接的网络。正确答案： C. Extranet(外部网络)

问题 6 下面哪个可感知OSI参考模型的4―7层，以便对如何为用户获得信息做出智能的决策?

正确答案： A. CN

问题 7 哪个同时具有物理和 ?

正确答案： B. FDDI

问题 8 CSMA/CD代表下面哪个?

正确答案： B. Carrier Sense Multiple Access/Collision Detect 问题 9 哪个使用类型字段? 正确答案： A. EthernetII

问题 10 Which of the following statements are true regarding a network using a subnet mask of 255.255.248.0? (Choose three)

正确答案： A. It corresponds to a Class A address with 13 bits borrowed

C. The network address of the last subnet will have 248 in the 3rd octet.

D. The subnetwork numbers will be in multiples of 8

问题 11 Which of the following IP hosts would be valid for PC users, assuming that a /28 network mask was used for all of the networks? (Choose all that apply.) 正确答案： A. 83.121.178.93 B. 134.178.18.56 C. 192.168.19.37

问题 12 进入配置模式，输入命令:conf t 正确答案：对

问题 13 哪层提供硬件寻址? 正确答案： C. 数据链路

问题 14 下面哪个同时具有物理星型拓扑和逻辑环型拓扑? 正确答案： C. 令牌环

问题 15 从闪存中备份IOS镜像时，copy flash tftp命令将提示用户输入以下哪些信息？正确答案： A. TFTP server IP address C. Source filename D. Destination filename

问题 16 于连接一个很小地域内的连网设备，例如大厦的一层、一座大厦或一个园区? 正确答案： B. LAN

问题 IEEE数据链路层的哪个组件指定网络协议？正确答案： A. LLC

问题 18 下面哪个描述可从任何位置连网的用户。正确答案： C. 移动用户

问题 19 在子接口配置模式中想要彻底地回到特权EXEC模式。应该键入什么？(选所有的可能)

正确答案： A. CTRL-Z B. end

问题 20 下面的以太网哪个同时具有物理和逻辑总线拓扑? 正确答案： B. 10Base2和10Base5

问题 21图中的家庭网络可能用到了哪些设备? 正确答案： A. 100Mbps以太网适配器 B. Category 5 双铰线电缆 C. 以太网集线器

问题 22 利用enable命令可以从用户EXEC模式进入特权EXEC 模式。正确答案：对

问题 23 下列哪项存储在ROM中？正确答案： A. POST

B. ROMMON

问题 24子网掩码的功能是区分网络地址、主机地址和定向广播地址。正确答案：对

问题 25 下面哪个提供高速的基础设施，以便在存储设备和文件服务器间传送数据? 正确答案： A. SAN

问题 26 要在路由器上启用IP路由选择，必须做什么？正确答案： A. 启用路由选择协议

C. 向路由器接口分配IP地址

问题 27 将下列各层从高到低排列为正确的顺序：会话层（a），表示层（b），物理层（c），数据链路层（d），网络层（e），应用层（f），传输层（g）。正确答案： f,b,a,g,e,d,c

问题 28 哪条路由器命令执行覆盖的过程？正确答案： copy running-config start copy running-config tftp 问题 29 下面哪个是SAN的缺点? 正确答案： A. 成本

问题 30 会话层使用下列哪种标准或协议? 正确答案： B. NFS

问题 31哪个拓扑在所有设备之间使用单一线路来连接? 正确答案： A. 总线

问题 32 下面哪个使用吉比特以太网介质类型? 正确答案： D. LAN和MAN

问题 33 下面哪个使用吉比特以太网介质类型? 正确答案： D. LAN和MAN

问题 34 如果想查看show 命令的参数清单，则用户会键入show ? 正确答案：对

问题 35默认哪些度量值组件在IGRP中使用？正确答案： A. 延迟 D. 带宽

测试二

问题 1 Which of the following IP hosts would be valid for PC users, assuming that a /28 network mask was used for all of the networks? (Choose all that apply.) 正确答案： A. 83.121.178.93

B. 134.178.18.56

C. 192.168.19.37

问题 2 哪个拓扑描述的是设备之间如何通信的? 正确答案： B. 逻辑

问题 3 要让路由器从ROM中的迷你IOS启动，可以输入路由器配置命令：boot system rom或者config-register 0x2401 正确答案：对

问题 4 下面哪个可感知OSI参考模型的4―7层，以便对如何为用户获得信息做出智能的决策?

正确答案： A. CN

问题 5 路由器自动地保存其配置。正确答案：错

问题 6 哪个是一种为一个公司到其他业务伙伴之间提供安全连接的网络。正确答案： C. Extranet(外部网络)

问题 7 Which of the following IP addresses fall into the CIDR block of 115.54.4.0/22? (Select three)

正确答案： A. 115.54.7.64 B. 115.54.6.255 C. 115.54.5.128

问题 8 用于连接一个很小地域内的连网设备，例如大厦的一层、一座大厦或一个园区? 正确答案： B. LAN

问题 9 下面哪个使用吉比特以太网介质类型? 正确答案： D. LAN和MAN

问题 10 要为1900系列交换机指定名称switch1，输入命令: hostname switch 正确答案：错

问题 11 下面哪个是SAN的缺点? 正确答案： A. 成本

问题 12 You have the following :199.141.27.0/27. Which of the following addresses can be allocated to hosts on the resulting subnet? 正确答案： A. 199.141.27.2 C. 199.141.27.13 D. 199.141.27.11

问题 13 Your ISP assigned you a full class A address space. From this, you need at least 300 sub-networks that can support at least 50 hosts each. Which of the subnet masks below are

capable of satisfying your needs? (Select two).

正确答案： A. 255.255.128.0 B. 255.255.192.0

问题 14 哪个用于提供可靠的连接。正确答案： B. 序号和确认

问题 15 要将配置寄存器的值改为0x2142，可以输入路由器配置模式命令：config-register 0x2402

正确答案：对

问题 16 下面哪个提供高速的基础设施，以便在存储设备和文件服务器间传送数据? 正确答案： A. SAN

问题 17 下面哪个同时具有物理星型拓扑和逻辑环型拓扑? 正确答案： C. 令牌环

问题 18 要删除在NVRAM中的用户的配置文件，可以使用路由器命令： erase start-config 正确答案：对

问题 19 Which of the following IP addresses for the network 27.35.16.32/28 can be assigned to hosts? (Choose three)

正确答案： B. 27.35.16.44 C. 27.35.16.45 D. 27.35.16.33

问题 20 哪个同时具有物理和逻辑环型拓扑? 正确答案： B. FDDI

问题 21 Using a subnet mask of 255.255.255.240, which of the IP addresses below can you assign to the hosts on this subnet? (Select all that apply) 正确答案： A. 92.11.178.93 B. 134.178.18.56

C. 192.168.16.87

问题 22 哪个拓扑在所有设备之间使用单一线路来连接? 正确答案： A. 总线

问题 23 会话层使用下列哪种标准或协议? 正确答案： B. NFS

问题 24 哪个使用类型字段? 正确答案： A. EthernetII

问题 25 将下列各层从高到低排列为正确的顺序：会话层（a），表示层（b），物理层（c），数据链路层（d），网络层（e），应用层（f），传输层（g）。正确答案： f,b,a,g,e,d,c 问题 26 哪层提供硬件寻址? 正确答案： C. 数据链路

问题 27 要删除在NVRAM中的用户的配置文件，可以使用路由器命令： erase start-config 正确答案：对

问题 28 下面哪个描述可从任何位置连网的用户。正确答案： C. 移动用户

问题 29 网络层解决以下所有的问题除了哪个？正确答案： C. 通过使用物理地址分层问题 30 CSMA/CD代表下面哪个?

正确答案： B. Carrier Sense Multiple Ac

问题 31 下面的以太网哪个同时具有物理和逻辑总线拓扑? 正确答案： B. 10Base2和10Base5

问题 32 You have a class B network with a 255.255.255.0 mask. Which of the statements below are true of this network? (Select all valid answers)

正确答案： A. 254 usable subnet.

B. 254 usable hosts persubnet

问题 33 Which two of the addresses below are available for host addresses on the subnet 192.168.16.19/28? (Select two answer choices)

正确答案： A. 192.168.16.17 B. 192.168.16.29

问题 34 IEEE数据链路层的哪个组件指定网络协议？正确答案： A. LLC

测试三

问题1 16 networks and 14 hosts are available per subnet if you apply a /28 mask to the 210.10.2.0 class C network.

正确答案：对

问题 2 You are the network administrator at TestKing. TestKing has been provided with the network address 165.100.27.0/24. The TestKing CEO wants to know how many subnetworks this address provides, and how many hosts can be supported on each subnet. What would your reply be? (Choose all that apply)

正确答案： A. One network with 254 hosts.

问题 3 172.31.128.255./18 is an example of a valid unicast host IP address. 正确答案：对

问题 4 Based on this diagram, which two devices can be used to complete the connection between the WAN router at the customer site and the service provider? (Choose two.) 正确答案： A. CSU/DSU B. modem

反馈： DTE is an abbreviation for Data Terminal Equipment, and refers to an end instrument that converts user information into signals for transmission, or reconverts the received signals into user information. A DTE device communicates with the DCE, such as a modem...

问题 5 A company has the following addressing scheme requirements: -uses a Class B IP address -currently has 60 subnets -has a maximum of 1000 computers on any network segment -needs to leave the fewest unused addresses in each subnet -uses RIP v1 Which subnet mask is appropriate to use in this network? 正确答案： A. 255.255.252.0

问题 6 TestKing has four offices, each with its own network, as shown in the graphic. Three of the networks have approximately 50 hosts each, and one network has 10 hosts. The multi-vendor routers are connected by serial links that use separate subnetwork numbers.The TestKing network has leased one Class C address to be used for all

networks and serial links, and they do not wish to replace any of their existing routers.

Which routing protocol would be most appropriate for this scenario?

正确答案： A. RIP version 2

反馈： The question describes 2 important requirements. The first is the fact that a routing protocol that supports VLSM is needed, as specified by the fact that one class C address range is to be used for all networks. The second is that routers from multiple vendors are being used, so the routing protocol chosen must be non-proprietary. RIP version 2 is a standards based routing protocol that supports variable length subnet masking (VLSM). Note that OSPF would also be a viable choice, but it was not one of the answer choices.

问题 7 The TestKing network was assigned the Class C network 199.166.131.0 from the ISP. If the administrator at TestKing were to subnet this class C network using the 255.255.255.224 subnet mask, 30 hosts they will be able to support on each subnet.

正确答案：对

问题 8 Which routing protocols can be used within the enterprise network shown in the diagram? (Choose three.) 正确答案： A. RIP v2 B. OSPF C. EIGRP

反馈： In this network there are IP subnets which use variable length subnet masks. RIP V2, OSPF and EIGRP are the interior routing protocols that support VLSM.

问题 9 You need to implement the use of a routing protocol that meets the following requirements: 1. Converges quickly 2. Supports VLSM, CIDR, IP, and IPX. 3. Uses minimal bandwidth for routing updates. Which one of the following routing protocols would be the best choice?

正确答案： A. EIGRP

问题 10 Topologies have two types. 正确答案：对

反馈： phisical and logic Topologies.

问题 11 If an Ethernet port on router was assigned an IP address of 172.16.112.1/20, what is the maximum number of hosts allowed on this subnet? 正确答案： C. 4094

问题 12 A new subnet with 12 hosts in the TestKing network has been added. Which subnet address should this network use to provide enough useable addresses while wasting the fewest addresses?

正确答案： B. 192.168.10.96/28

问题 13 A new subnet with 60 hosts has been added to the TestKing network shown below. Which subnet address should this network use to provide enough usable addresses while wasting the fewest addresses? Exhibit:

正确答案： B. 192.168.1.64/26

反馈： A subnet mask of 255.255.255.192 (/26) will be needed to support 60 hosts. Option B will allow for this number of hosts, and the next available IP subnet in the 192.168.1.0 subnet that is not al-ready used in the network is 192.168.1.64.

问题 14 A brand new network application is required for the Acme Company, and they are consid-ering the use of a connectionless service. What are the characteristics of a connectionless service? (Select two answer choices)

正确答案： B. It uses a Non-reliable transport mechanism

C. It is less bandwidth-intensive than connection oriented services

问题 15 You work as network consultant. Your customer, TestKing Inc, has a class C network license. TestKing wants you to subnet the network to provide a separate subnet for each of its 5 de-partments. Each subnet must support at least 24 hosts. Which network mask will be use? 正确答案： B. 255.255.255.224

反馈： The default subnet mask for class C network is 255.255.255.0. If one has to create 5 subnets, then 3 bits are required. With 3 bits we can create 6 subnets. Remaining 5 bits are used for Hosts. One can create 30 hosts using 5 bits in host field.

问题 16 Consider the 192.1.1.0/24 network in this exhibit. This network uses RIP v2. Which combi-nation of subnetwork assignments will satisfy the requirements for networks A, B, and C of this design? (Select three)

正确答案： A. Network A = 192.1.1.128/25

B. Network B = 192.1.1.4/30

C. Network C = 192.1.1.64/26

反馈： To properly answer this question, it is best to start from the end, which is network C. Since net-work C requires at least 55 host addresses, a /26 network must be used. A network mask of /26 will provide for 62 usable IP addresses while a /27 network will ...

问题 17 In the TestKing network shown below, which subnet address could a network administrator use for Network A on the left? Exhibit: 正确答案： C. 192.168.35.128/26

问题 18 In network that support VLSM, which network mask should be used for point-to-point WAN links in order to reduce waste of IP addresses?

正确答案： B. /30

反馈： A 30-bit mask is used to create subnets with two valid host addresses. This is the exact number needed for a point-to-point connection.

问题 19 Using a Class C IP network, which subnet mask will provide one usable subnet per depart-ment while allowing enough usable host addresses for each department specified in the graphic?

正确答案： C. 255.255.255.224

反馈： Choice C will provide for 8 separate subnets with 30 usable hosts per subnet. Since we only re-quire 5 different subnets with at most 16 users, this will suffice.

问题 20 In this diagram, OSPF is used as the routing protocol between the corporate office and the offices on the left side of the diagram. An ISDN link provides connectivity from the central corporate router to the remote sales office on the right side of the diagram.Which type of route should the corporate office use to reach the router on the right side of the diagram if the overhead on the ISDN link is to be kept to a minimum? 正确答案： C. A static route 反馈： A static route uses the least amount of overhead because no routing protocol information will be exchanged over the ISDN link. As long as the ISDN link is up, the static route will always remain in the routing table of the corporate router.

问题 21 You are the network administrator at TestKing. TestKing has been assigned the class C IP address 189.66.1.0 by its Internet Service Provider. If you divide the network range by using the 255.255.255.224 subnet mask, how many hosts can be supported on each ? 正确答案： C. 30

反馈： The subnet mask 255.255.255.224 is a 27 bit mask

11111111.11111111.11111111.11100000). It uses 3 bits from the host Id for the network ID, leaving 5 bits for host addresses. We can calculate the number of hosts supported by this subnet by using the 2^n-2 formul...

问题 22 You have a Class C network, and you need ten subnets. You wish to have as many addresses available for hosts as possible. Subnet masks 255.255.255.240 you should use. 正确答案：对

问题 23 Which of the following statements are true regarding how router A will chose a path to router E? (Choose three)

正确答案： A. If RIP and IGRP are both configured on router A, the router will use the route learned by RIP.

B. If RIP is the routing protocol, router A will determine all paths have an equal cost.

C. If IGRP is the routing protocol, router A will determine that path ADE has the lowest cost. 反馈： RIP simply uses hop counts as the metric for path determination, so RIP will see all routes as equal in this case. IGRP uses bandwidth and delay, by default, so it will prefer the paths over the T3 links. By default, IGRP routes are always preferred over RIP....

问题 24 How would you express the binary number: 10101010 in its decimal and hexadecimal forms?

正确答案： B. Decimal=170, hexadecimal=AA

反馈： For the binary equivalent of 10101010 to Decimal, the answer is 128+32+8+2=170. For the hexa-decimal number, we need to break up the binary number into two bytes of 1010 and 1010. Each one in binary is then 10 and 10, which is A and A in hexadecimal.

问题 25 You are a network administrator and you need to implement a routing protocol on your network that provides: * Scalability * VLSM support * Minimal overhead * Support for connecting networks using routers of multiple vendors Which of the following routing protocol would best serve your needs? 正确答案： D. OSPF

反馈： Since one of the requirements is that the routing protocol must support other vendors, our only choices are RIP and OSPF. Since RIP version 1 does not support VLSM, OSPF is the only choice.

问题 26 A network associate needs to configure a router by connecting a remote computer to the router through the router auxiliary port. Which two statements describe the hardware re-quired to make the connection to the router? (Choose two.)

正确答案： A. The auxiliary port must be connected to a modem. D. The technician needs an RJ-45 to DB25 adapter.

反馈： When a modem is connected to the auxiliary port, a remote user can dial in to the router and con-figure it. Use the light blue console cable and the DB-9-to-DB-25 connector adapter that came in the router accessory kit. Connect the RJ-45 end of the adapt

问题 27 The network with the IP address 172.31.0.0/19 is to be configured on the TestKing router with the partial configuration shown in the graphic. Which of the following statements describes the number of available subnets and hosts that will result from this 正确答案： D. There are 8 usable subnets, with 8190 usable host addresses.

反馈： The 172.31.0.0/19 will have 3 bits in the network portion, and 13 bits in the host portion. This will allow for 2^3 = 8 networks and 2^13 = 8192 hosts available for each network (8190

usable). Since the IP subnet-zero command is used the first network is a

问题 28 The TestKing network consists of a small office with twenty-five employees that has one connection to the Internet through the TK1 router. What routing configurations are recom-mended on the TK1 and ISP routers?

正确答案： D. A default route on TK1 and a static route on the ISP router.

问题 29 You are a technician at TestKing. Your newly appointed TestKing trainee wants to know what the CDP is. What would your reply be? (Choose all that apply.) 正确答案： A. It is globally enabled by default on Cisco routers. C. It is a proprietary protocol.

D. It can be used to gather hardware and protocol information about neighbor devices. 反馈： Cisco Discovery Protocol (CDP) is a Cisco proprietary protocol designed to help administrators collect information about local and remote devices. You can use the CDP to gather hardware and protocol information about neighbor devices...

问题 30 What is the maximum number of IP addresses that can be assigned to hosts on a local subnet that use the 255.255.255.224 subnet mask? 正确答案： D. 30

问题 31 The TestKing Network consists of the following 5 IP networks: NETWORK 1: 192.168.10.0/26 NETWORK 2: 192.168.10.64/27 NETWORK 3: 192.168.10.96/27 NETWORK 4: 192.168.10.128/30 NETWORK 5: 192.168.10.132/30 Which of the following routing protocols will support this IP addressing scheme?(Choose all that apply).

正确答案： A. OSPF C. EIGRP

D. RIP version 2

反馈： Because this network is using IP subnets with variable length subnet masks, only routing protocols that support VLSM will fit this particular case. The routing protocols that support VLSM are RIP v2, EIGRP and OSPF.

问题 32 Your TestKing trainee Bob asks you what 11111001 binary is in decimal. What should you tell him?

正确答案： D. 249

问题 33 If a host on a network has the address 172.16.45.14/30, the host's ip address 172.16.45.0 belongs to the subnetwork. 正确答案：错

问题 34 What is the network address for a host with the IP address 201.100.5.68/28? 正确答案： C. 201.100.5.64

反馈： This is a C ip with a subnet mask of 255.255.255.240 the host 201.100.5.68/28 belong to the sec-ond subnet which is 201.100.5.64 this is determined by doing the following: subnets?2^4-2=14 hosts?2^4-2=14 valid subnet range?256-240=16 16+16=32,16+32=4 问题 35 You need to choose a routing protocol for a new TestKing network. This network will be running IP, IPX, and Appletalk, and you wish to utilize only one routing protocol. Which one would be the best choice? 正确答案： B. EIGRP

反馈： Only EIGRP provides routing protocol support for IP, IPX, and Appletalk networks.

问题 36 The TestKing network administrator has designed the IP scheme as shown in the diagram below. What effect will this addressing scheme have on the network? Exhibit:

正确答案： C. The addressing scheme will allow all IP traffic between the LANs.

测试四

问题1：RIP version 2 is being used as the routing protocol within the TestKing network. What does RIP version 2 use to prevent routing loops? (Choose two)

正确答案： A. Hold-down timers B. Split horizon

反馈： Distance Vector routing protocols employ the split horizon mechanism to reduce the possibility of routing loops. Split horizon blocks information about routes from being advertised by a router out of any interface from which that information originated.

问题 2 The TestKing network is displayed in the following diagram: Based on the diagram shown above, which of the devices shown can transmit simultaneously without causing collisions?

正确答案： B. Only hosts attached to the switch

问题 3 With the extended ping command you can specify the timeout value. 正确答案：对

问题 4 If a host on a network has the address 172.16.45.14/30, what is the address of the subnetwork to which this host belongs? 正确答案： D. 172.16.45.12

反馈： The last octet in binary form is 00001110. Only 6 bits of this octet belong to the subnet mask. Hence, the subnetwork is 172.16.45.12.

问题 5 Given that you have a class B IP address network range, which of the subnet masks below will allow for 100 subnets with 500 usable host addresses per subnet? 正确答案： C. 255.255.254.0

反馈： Using the 2^n-2 formula for host addresses, 2^9-2 = 510 host address, so a 9-bit subnet mask will provide the required number of host addresses. If these 9 bits are used for the hosts in a class B network, then the remaining 7 bits are used for the number of subnet

问题 6 Two buildings on the San Jose campus of the TestKing network must be connected to use Ethernet with a bandwidth of at least 100 Mbps. The company is concerned about possible problems from voltage differences between the two buildings. Which media type should be used for the connection?

正确答案： C. Fiber optic cable

反馈： Since fiber optic cable does not carry electrical charges, all electrical cable problems disappear. When fiber optic cable (outdoor quality) is used to link buildings, grounding problems, ground loops, and voltage spikes are eliminated and fiber-optic cable is all so immune to electronic eavesdropping. The other options (STP, Coax, and UTP) are all copper based and prone to electrical interferences.

问题 7 How many usable IP addresses can you get from a conventional Class C address? 正确答案： C. 254

问题 8 Which one of the following varieties of NAT utilizes different ports to map multiple IP ad-dresses to a single globally registered IP address? 正确答案： C. NAT Overloading

问题 9 Based on the information shown above, which routing protocols can be used within the TestKing network show in the diagram? (Choose three).

正确答案： B. RIP v2

C. OSPF D. EIGRP

反馈： Explanation: the exhibit showed routers withVariable Length Subnet Mask (VLSM), and asked which 3 protocols can be used. 3 protocols that support VLSM are RIP v2, OSPF and EIGRP. 问题 10 Refer to the exhibit shown below. What is needed to allow host A to ping host B? 正确答案： A. a backbone switch connecting the switches with either fiber optic or straight-through cables

反馈： Routers are Layers 3 devices used for inter-network communication. In this scenario there are two different networks, so both switches need to connect to a router using straight-through cables.

问题 11 The 213.115.77.0 network was subnetted using a /28 subnet mask. How many usable subnets and host addresses per subnet were created as a result of this?

正确答案： D. None of the above

反馈： A class C subnet with a 28 bit mask requires 4 bits for the network address, leaving 4 bits for host addresses. Using the 2n-2 formula (24-2 in this case) we have 14 host addresses and 16 network addresses.

问题 12 On the topic of VLSM, which one of the following statements best describes the concept of the route aggregation?

正确答案： B. Combining routes to multiple networks into one supernet.

问题 13 You need to configure a single router into load balancing traffic across 4 unequal cost paths. Which routing protocols can satisfy this requirement? (Select two) 正确答案： C. IGRP

D. EIGRP

反馈： In general, load balancing is the capability of a router to distribute traffic over all its network ports that are the same distance from the destination address. Load balancing increases the utilization of network segments, thus increasing effective network...

问题 14 When designing OSPF networks; what is the purpose of using a hierarchical design? 正确答案： B. To speed up convergence

C. To confine network instability to single areas of the network D. To reduce routing overhead

反馈： An OSPF network designed in a hierarchical fashion with different areas is used because a small change in the topology of a single area won't force every router to run the SPF algorithm. Changes in one area are limited to that area only, not to every router...

问题 15 The TestKing corporate LAN consists of one large flat network. You decide to segment this LAN into two separate networks with a router. What will be the affect of this change? The number of broadcast domains will be decreased. 正确答案：错

反馈： A router does not forward broadcast traffic. It therefore breaks up a broadcast domain, reducing unnecessary network traffic. Broadcasts from one segment will not be seen on the other segment.

问题 16 载波侦听多路访问访问检测是现代LAN上最流行的访问控制方法。正确答案：对

问题 17 Which of the following routing protocols do NOT support VLSM (variable length

subnet masking)?

正确答案： A. RIPv1 B. IGRP

反馈： RIP version 1 and IGRP are classful IP routing protocols. They do not support variable length subnet masks.

问题 18 Given the choices below, which address represents a unicast address? 正确答案： D. 172.31.128.255/18 反馈： 172.31.128.255 is the only unicast address. It seems to be a broadcast address, because of 255 in the last octet. However, the broadcast address for this network is actually 172.31.131.255. 问题 19 How do you express the binary number 10110011 in decimal form? 正确答案： C. 179

问题 20 Based on this diagram, which of the following is true?

正确答案： C. If Fa0/0 is down on Router 1, Host A cannot access Server 1.

反馈： A VLAN has the same attributes as a physical LAN, but it allows for end stations to be grouped together even if they are not located on the same LAN segment. The above diagram is configured with inter-VLAN communication so the router has a great role to ....

问题 21 The MAC address for your PC NIC is: C9-3F-32-B4-DC-19. What is the address of the OUI portion of this NIC card, expressed as a binary number? 正确答案： D. 11001001-00111111-00110010 问题 22 RIP是路由选择协议? 正确答案：对

问题 23 Two TestKing devices are connected as shown below: How many broadcast domains are shown in the graphic assuming only the default VLAN is con-figured on the switches?

正确答案： A. One

反馈： There is only one broadcast domain because switches and hubs do not segment the broadcast do-mains when only a single VLAN is configured. Only layer 3 devices can segment the broadcast domains, or VLAN-capable switches where multiple VLANs are configured.

问题 24 Which of the following routing protocols support the use of VLSM (Variable Length Subnet Masking)? (Select three)

正确答案： B. EIGRP C. OSPF D. RIPv2

反馈： Static routing, OSPF, IS-IS, EIGRP, BGP, and RIP version 2 all support VLSM.

问题 25 Which of the routing protocols shown below support both VLSM and route summarization?

正确答案： A. EIGRP C. RIP v2 D. OSPF

反馈： EIGRP and OSPF support Variable Length Subnet Masks (VLSM) and provide for both automatic and manual route summarization configurations. RIPv2 is an enhanced version of RIP, and over-came some of the limitations of RIP by introducing support for VLSM.

问题 26 The corporate LAN shown in the TestKing network uses IP network 172.28.4.0/22 for all departments. All workstations use 172.28.4.1 as a default gateway address. Network

admin-istrators have recently become concerned that excessive broadcasts are slowing network performance. Which change is most likely to reduce broadcast traffic on the corporate LAN? 正确答案： D. Implement VLANs after creating IP subnets for each department.

反馈： Switches using VLANs create the same division of the network into separate broadcast domains but do not have the latency problems of a router. Switches are also a more cost-effective solution.

问题 27 The IP network 210.106.14.0 is subnetted using a /24 mask. How many usable networks and host addresses can be obtained from this?

正确答案： A. 1 network with 254 hosts

问题 28 You have a single Class C IP address and a point-to-point serial link that you want to im-plement VLSM on. Which subnet mask is the most efficient? 正确答案： D. 255.255.255.252

问题 29 In the network above Host 1 cannot ping Host 2. What needs to be configured to allow host 1 and host 2 to communicate?

正确答案： D. A router needs to be configured to route between the VLANs

反馈： By default only members of the same VLAN can communicate with each other. For inter-VLAN communication we require a router to route between the different VLANs. Alternatively, if Host1 and Host2 were in the same subnet and the same VLAN, then they would also would also be able to communicate.

问题 30 IEEE 802.11b 的运行速度可达 11 Mbps 正确答案：对

问题 31 Refer to the exhibit. All of the routers in the TestKing network are configured with the \"ip subnet-zero\" command. Which network addresses should be used for Link A and Network A? 正确答案： A. Link A -172.16.3.0/30

C. Network A -172.16.3.128/25

问题 32 Study the Exhibit carefully. What switch functionality will prevent Layer 2 broadcasts from mov-ing between the networks shown?

正确答案： A. VLAN

反馈： All devices in a VLAN are members of the same broadcast domain and receive all broadcasts. The broadcasts, by default, are filtered from all ports on a switch that are not members of the same VLAN. This is great because it offers all the benefits you gain

问题 33 A TestKing PC has the IP address 172.16.209.10 /22. What is the subnet of this address?

正确答案： C. 172.16.208.0

反馈： 172.16.209.10/22 translates to 10101100.00010000.11010001.00001010 in binary form. The network portion is 22 bits, so after the logical AND comparison the network address translates to10101100.00010000.110100001.00001010.

问题 34 The 201.145.32.0 network is subnetted using a /26 mask. How many networks and IP hosts per network exists using this subnet mask? 正确答案： C. 4 networks and 62 hosts 反馈： A class C network with a 26 bit mask requires 2 bits for the network address, leaving 6 bits for host addresses. Using the 2n-2 formula (22 for the network and 26-2for hosts) we have 4 network addresses and 62 host addresses.

问题 35 You have a class C network, and you need to design it for 5 usable subnets with each

subnet handling a minimum of 18 hosts each. Which of the following network masks should you use?

正确答案： D. 255.255.255.224

反馈： The default subnet mask for class C network is 255.255.255.0. If one has to create 5 subnets, then 3 bits are required. With 3 bits we can create 6 subnets. The remaining 5 bits are used for Hosts. One can create 30 hosts using 5 bits in host field.

问题 36 The extended ping command is available from privileged EXEC mode. 正确答案：对

反馈： The extended ping command works only at the privileged EXEC command line. Some of the ex-tended ping command values include the datagram size and timeout value as shown: Datagram size [100]:Size of the ping packet (in bytes). Default: 100 bytes.

测试五

问题 1 Which one of the following commands would you enter to terminate a VTY line session?

正确答案： D. exit

反馈： A VTY line is a telnet session. To end a telnet session from a remote device, enter the exit or log-out command.

问题 2 10xxxxxx binary bit patterns below denotes a Class B address. 正确答案：对

问题 3 Which of the following technologies can be used in distance vector routing protocols to prevent routing loops? (Select all valid answer choices) 正确答案： C. Hold-down timers D. Split horizon

问题 4 Which of the following describe private IP addresses? (Choose two) 正确答案： B. Addresses that cannot be routed through the public Internet. D. A scheme to conserve public addresses.

问题 5 Which of the following OSPF commands, when used together, will put the network 192.168.10.0/24 into OSPF area 0? (Select all valid responses)

正确答案： A. Router(config-router)# network 192.168.10.0 0.0.0.255 area 0 D. Router(config)# router ospf 1

反馈： The network command specifies the IP address (192.168.10.0) followed by the wildcard mask (not the subnet mask), and the area that is to be associated with the OSPF address range (in this case, area 0). The wildcard mask indicates in binary how much of

the IP address much be matched with 0s indicating that the bits must match and 1 indicating that they may vary. Thus 0.0.0.255 or

00000000.00000000.00000000.11111111 indicates that any bit in the last octet can vary while all bits in the first 3 octets must match the network address (in other words, 192.168.10.xx)

问题 6 As a network technician at TestKing.com you would like to implement NAT in the network shown in the exhibit. You would like to allow inside hosts to use a private addressing scheme. Where should NAT be configured? 正确答案： A. TestKing1 router

问题 7 Which command will configure a default route on a router?

正确答案： D. router(config)# ip route 0.0.0.0 0.0.0.0 10.1.1.1

问题 8 Assume that RIP v1 is the only routing protocol in use. What is the Maximum number of usable IP address that can be supported on each LAN if the TestKing network is using one Class C address block?

正确答案： A. 14

反馈： RIP version 1 does not support VLSM information, so all networks must have the same subnet mask. In the network above, there are a total of 12 networks (6 LANs and 6 different point to point WAN connections). Therefore, if each of the 12 networks use the .....

问题 9 You are given a PC, a router, and a cable. Select the correct combination that will allow you to log into the router locally using a terminal emulation program such as HyperTerminal. 正确答案： B. Connect the PC's COM port to the router's console port using a rollover cable. 反馈： To connect the Router in Console port to configure using HyperTerminal, you required the Roll-over Cable, which connects the PC's COM port to the router's Console port. 问题 10 Your network uses the 172.12.0.0 class B address. You need to support 459 hosts per subnet, while accommodating the maximum number of subnets. The mask 255.255.254.0 you would use.

正确答案：对

问题 11 The Testking WAN is displayed in the diagram below: Which dynamic routing protocol should be recommended for the Testking network shown in the graphic above? (Choose three)

正确答案： A. OSPF

C. RIP version 2 D. EIGRP

反馈： In this network, the 192.168.23.0/24 network is subnetted into two other networks. Because this class C network is being subnetted, a routing protocol that supports variable length subnet mask information is required. OSPF, EIGRP, and RIP version 2 all ....

问题 12 You are a systems administrator at TestKing and you've just acquired a new Class C IP network. The subnet masks 255.255.255.224 is capable of providing one useful subnet for each of the above departments (support, financial, sales & development) while still allowing enough usable host addresses to meet the needs of each department.

正确答案：对

问题 13 Which one of the following parameters is the very first thing that needs to be configured as part of the IGRP routing process?

正确答案： D. The Autonomous System number

问题 14 TestKing.com is merging with several local businesses that use routers from multiple vendors. Which routing protocol would work best to connect TestKing.com with the enterprise networks it has acquired by providing scalability and VLSM support while minimizing network overhead?

正确答案： A. OSPF

反馈： RIP (both version 1 and version 2) is standards based, providing inter-operability support between vendors. RIPv2 is an enhancement to the first version and contains the following enhancements: 1. Support for variable length subnet masks (VLSM) (Because of this, RIP doesn't assume that all networks are classful.) 2. Multicast routing updates 3. Authentication with an encrypted password for routing updates

问题 15 A network administrator would like to implement NAT in the network shown in the graphic to allow inside hosts to use a private addressing scheme. Where should NAT be configured?

正确答案： A. Corporate router

问题 16 What parameters must you specify when you enable EIGRP routing? 正确答案： D. EIGRP routing, network number, and AS

问题 17 A medical imaging company must redesign its network to use LAN and WAN topologies that provide the highest degree of redundancy. Which topologies should the company choose for the most redundancy? (Choose two)

正确答案： C. Dual ring D. Mesh

问题 18 In EIGRP, what kind of route information is stored in the RAM of the router and main-tained by way of hello packets and update packets? (Select two answer choices) 正确答案： A. Neighbor Table D. Topology Table

问题 19 A Cisco router has been configured with the following command: IP nat pool nat-test 192.168.6.10 192.168.6.20 netmask 255.255.255.0 This is an example of what type of NAT?

正确答案： B. Dynamic NAT

反馈： The configuration statement in this example is used to define a pool of IP addresses to be used for dynamic NAT translations.

问题 20 In which situation would the use of a static route be appropriate?

正确答案： B. To configure a route from an ISP router into a corporate network.

问题 21 A network administrator is designing a Cisco network for a large company. The network must be able to use minimal bandwidth for routing updates, converge quickly, and support VLSM, CIDR, IP and IPX. Which routing protocol will best fit the requirements of this network?

正确答案： D. EIGRP

反馈： Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco-proprietary routing protocol based on IGRP. Unlike IGRP, which is a classful routing protocol, EIGRP supports CIDR, allow-ing network designers to maximize address space by using CIDR and VLSM.

问题 22 Which sequence of actions will allow telnet traffic from a user's PC to a router using TCP/IP?

正确答案： D. Connect the PC's Ethernet port to the router's Ethernet port using a crossover cable.

反馈： A crossover cable is used to directly connect a switch to a switch, a hub to a hub, a host to a host, or a host's Ethernet port to a router's Ethernet interface. If your Router's interface is configured with IP addressing and telnet service is ...

问题 23 You are a network administrator of a small company that's experiencing explosive growth. The company is going to open up seven more regional offices with the potential of more in the future. These regional offices send and receive mission critical traffic, and will need to be connected to the head office around the clock. However, your head office doesn't have any additional free ports available on the router. Which of the following technologies would be the best choice for this new WAN?

正确答案： A. Frame Relay

反馈： Frame Relay is a dedicated service that would be acceptable for a mission critical WAN applica-tion, and multiple locations can connect to a single router port. The use of frame relay PVCs can connect all the locations together, while using only one physic

问题 24 In this network, subnet 10.1.3.0/24 is unknown to router TK2. Which router command will prevent router TK2 from dropping a packet destined for the 10.1.3.0/24 network if a default route is configured?

正确答案： A. ip classless

反馈： All Cisco routers are classful routers, meaning that they expect a default subnet mask on each in-terface of the router. When a router receives a packet for a destination subnet that's not in the routing table, it will drop packets by default.

问题 25 172.16.208.0 is the subnet for the host IP address 172.16.210.0/22. 正确答案：对

问题 26 Which of the following routing protocols are less likely prone routing loops and network reachability problems when used in discontiguous networks? (Select all valid responses) 正确答案： A. OSPF D. EIGRP

反馈： Only OSPF, RIP version 2, and EIGRP carry VLSM information. In a discontiguous network, subnet masks of different lengths can be used, but this information will need to be propagated via the routing protocol if all networks are to be reached.

问题 27 The TestKing network is implementing dialup services for their remote employees. TestKing uses several different Layer 3 protocols on the network. Authentication of the users con-necting to the network is required for security. Additionally, some employees will be dialing long distance and will need callback support.

Which protocol is the best choice for these remote access services?

正确答案： D. PPP

问题 28 You are a systems administrator of an HR company in Dallas. You want to connect your company's head office with a branch office in Detroit. To do this, you want to use two data link layer encapsulations: one exclusively for data and the other exclusively for signaling. Which one of the following WAN services would best suit your needs?

正确答案： A. ISDN

反馈： ISDN Q.931 messages are used for signaling via the ISDN D channel. ISDN B channels are used to transport data.

问题 29 The TestKing network is replacing all of their hubs with new switches. How does a switch differ from a hub?

正确答案： A. A switch operates at a lower, more efficient layer of the OSI model.

反馈： A switch is essentially a fast, multi-port bridge, which can contain dozens of ports. Rather than creating two collision domains, each port creates its own collision domain. In a network of twenty nodes, twenty collision domains exist if each node is ....

问题 30 The Testking Corporation consists of the head office in New York with its regional offices in: Chicago, Detroit, Philadelphia, Toronto, and Atlanta. These offices need to be connected in a WAN, and Testking wishes to do this via a hub and spoke arrangement that will utilize packet-switched technology. 正确答案： C. Frame Relay

反馈： To provide efficient IP multicast support in Frame Relay networks, the underlying Frame Relay network architecture should be designed in a \"hub and spoke\" topology

(hierarchical topology). The hub and spoke topology is also named a \"star\" topology,

because the central hub acts as the center of a star and the connections to the remote sites act as light radiating from the star. In the hub and spoke topology, each remote router may also act as a hub and each connection to another remote site may act as a spoke (in a hierarchical fashion). In a multiple hub topology, the load associated with sending

broadcast and multicast data can be distributed across multiple central hub sites rather than concentrated at a single central site. Thus, even though data may require extra hops to get to a particular location, data delivery is more efficient in a hub and spoke network than in other network topologies. This design also provides a scalable, hierarchical

network that greatly reduces the resource requirements of the central router, allowing the Frame Relay network to utilize the advantages of IP multicast applications.

问题 31 00000111-10001111 is the IP address range for the first octet in a class B address, in binary form. 正确答案：错

问题 32 201.100.5.65 is the subnet for the host IP address 201.100.5.68/28. 正确答案：错

问题 33 After the router interfaces shown in the diagram have been configured, it is discovered that hosts in the Branch LAN cannot access the Internet. Further testing reveals additional con-nectivity issues. What will fix this problem?

正确答案： B. Change the address of the Branch router WAN interface.

反馈： The serial line connection between the Branch office and the HG office should have interfaces that belong in the same subnet. Based on the diagram above, the WAN interface of the Branch router is configured with an IP address that is in a different IP network than

the serial interface of the HG router. As it is set up currently, no traffic will pass from the Branch router to the HG until these two interfaces are in the same subnet.

问题 34 TestKing has 25 computers and decides to connect the network to the Internet. TestKing would like for all of the computers to have access to the Internet at the same time, but Test-King only has four usable publicly routable IP addresses. What should be configured on the router so that all computers can connect to the Internet simultaneously?

正确答案： D. Dynamic NAT with overload

反馈： NAT overload, also called many to one NAT or Port Address Translation (PAT) allows for many IP hosts to share a single IP address when connecting to the outside. In this case, the use of dynamic NAT with overloading will allow for the 25 hosts to use an IP address from the NAT pool, which will contain the 4 public IP addresses.

问题 35 Which PPP subprotocol negotiates authentication options? 正确答案： D. LCP

问题 36 Which of the following OSPF commands, when used together, will put the network 192.168.10.0/24 into OSPF area 0? (Select all valid responses)

正确答案： A. Router(config-router)# network 192.168.10.0 0.0.0.255 area 0 D. Router(config)# router ospf 1

反馈： The network command specifies the IP address (192.168.10.0) followed by the wildcard

mask (not the subnet mask), and the area that is to be associated with the OSPF address range (in this case, area 0). The wildcard mask indicates in binary how much of the IP address much be matched with 0s indicating that the bits must match and 1 indicating that they may vary. Thus 0.0.0.255 or 00000000.00000000.00000000.11111111 indicates that any bit in the last octet can vary while all bits in the first 3 octets must match the network address (in other words,192.168.10.xx)

测试六

问题 1 You've been assigned the CIDR (classless inter domain routing) block of 115.64.4.0/22 from your ISP. Which of the IP addresses below can you use for a host? (Select all valid answers) 正确答案： A. 115.64.7.64 B. 115.64.6.255

反馈： 115.64.4.0 = 01110011.01000000.00000100.00000000 Subnet mask = 11111111.11111111.11111100.00000000= 255.255.252.0 Subnet number = 01110011.01000000.00000100.00000000= 115.64.4.0 Broadcast = 01110011.01000000.00000111.11111111= 115.64.7.255

问题 2 The MAC address is: C8-3E-32-B4-DC-19. What is the address of the OUI portion of this NIC card, expressed as a binary number?

正确答案： D. 11001000-00111110-0011001

问题 3 距离向量协议用下面哪个散布路由选择信息。正确答案： C. 广播

问题 4 使用哪种方法防止分组永久沿环路循环？正确答案： D. TTL

问题 5 What is the subnet for the host IP address 201.100.5.69/28? 正确答案： A. 201.100.5.64 问题 6 下面哪个规定：若相邻路由器向路由器发送路由，接收路由器不会在相同接口将该路由传播回通告路由器。正确答案： A. 水平分割

问题 7 输入在路由器上查看当前路由选择协议及其特性和配置的路由器命令：show ip protocols 。正确答案：对

问题 8 3 addresses are shown in binary form in the exhibit. Regarding these three binary addresses in the above exhibit; which statements below are correct? (Select three) 正确答案： A. Address C is a public Class C address. C. Address A is a public Class A address. D. Address B is a private Class B address. 问题 9 下面关于RIP版本2哪个是正确的？正确答案： A. 它使用触发更新问题 10 哪个是混合协议的例子？正确答案： B. EIGRP

问题 11 How many subnetworks and hosts are available per subnet if you apply a /28 mask to the 10.10.2.0 class C network?

正确答案： A. 14 networks and 14 hosts

问题 12 输入查看IP路由选择表的路由器命令：show ip route 。

正确答案：对

问题 13 某路由器在自治系统150中。输入进入路由选择进程的IGRP命令：router igrp 150 。

正确答案：对

问题 14 RIP每秒产生路由选择更新。正确答案： B. 30

问题 15 输入访问RIP配置的路由器命令：route rip 。正确答案：对

问题 16 Which two of the addresses below are available for host addresses on the subnet 192.168.15.19/28? (Select two answer choices) 正确答案： A. 192.168.15.17 C. 192.168.15.29

问题 17 If a host on a network has the address 172.16.45.14/30, what is the address of the subnetwork to which this host belongs? 正确答案： A. 172.16.45.12 B. 172.16.45.13

问题 18 Your ISP has assigned you the following IP address and subnet mask: IP address: 199.141.27.0 Subnet mask: 255.255.255.240 Which of the following addresses can be allocated to hosts on the resulting subnet? (Select all that apply) 正确答案： A. 199.141.27.2 C. 199.141.27.13

D. 199.141.27.11 反馈： IP address = 11001000.10001101.00011011.00000000 = 199.141.27.0 Subnet mask = 11111111.11111111.11111111.11110000 = 255.255.255.240 Subnet # = 11001000.10001101.00011011.00000000 = 199.141.27.0 Broadcast = 11001000.10001101.00011011.00001111 = 199.141.27.15

问题 19 有一种距离向量协议，例如RIP。在其中一个路由器接口上，有如下IP地址：192.168.1.65 255.255.255.192。输入允许IP路由选择用于该网络的命令：network 192.168.1.0 。正确答案：对

问题 20 The TestKing network was assigned the Class C network 199.166.131.0 from the ISP. If the administrator at TestKing were to subnet this class C network using the 255.255.255.240 subnet mask, how may hosts will they be able to support on each subnet? 正确答案： D. 14

问题 21 What is the subnet for the host IP address 172.16.200.0/20? 正确答案： C. 172.16.192.0

问题 22 哪些命令启动IP路由选择进程？正确答案： C. network

问题 23 RIP最多为条路径支持负载均衡。正确答案： C. 6，同等成本

问题 24 哪条IGRP命令允许非同等成本负载均衡？正确答案： A. variance

反馈： variance允许IGRP中的非同等成本负载均衡

问题 25 How would the number 239 be expressed as a binary number?

正确答案： D. 11101111

问题 26 IGRP每秒产生一次更新。正确答案： C. 90

问题 27 What is the network address for a host with the IP address 201.100.5.68/28? 正确答案： A. 201.100.5.64

问题 28 RIP有跳的最大跳数。正确答案： B. 15

问题 29 路由选择协议用下面哪个确定哪挑路径是最佳路径。正确答案： B. 度量值

问题 30 You have a Class C network, and you need 13 subnets. You wish to have as many addresses available for hosts as possible. Which one of the following subnet masks should you use?

正确答案： C. 255.255.255.240

问题 31 输入清除路由选择表的路由器命令：clear ip route 。正确答案：错

问题 32 Which of the following is an example of a valid unicast host IP address? 正确答案： 172.31.128.255/18

问题 33哪种路由选择协议使用最短路径优先算法？正确答案： B. 链路状态

问题 34 Your ISP assigned you a full class B address space. From this, you need at least 300 sub-networks that can support at least 50 hosts each. Which of the subnet masks below are capable of satisfying your needs? (Select two). 正确答案： A. 255.255.255.128 D. 255.255.255.192

反馈： With 9 bits used for the subnet portion, we get 510 subnets and using the remaining 7 bits for the hosts gives us 126 hosts per subnet. The subnet mask will be 255.255.255.128 With 10 bits used for the subnet portion, we get 1022 subnets and then using the....

问题 35 Using a subnet mask of 255.255.255.224, which of the IP addresses below can you assign to the hosts on this subnet? (Select all that apply) 正确答案： A. 92.11.178.93 B. 134.178.18.56 C. 192.168.16.87

反馈： Since the subnet mask is 255.255.255.224, the number of network hosts that is available is

30. Every network boundary will be a multiple of 32. This means that every subnet will be a multiple (0, 32, 64, 96, 128, 160, 192, 224) and the broadcast address for each of these subnets will be one less this number (31, 63, 95, 127, 159, 191, 223). Therefore, any IP address that does not end in one of these numbers will be a valid host IP address.

问题 36 You have a class B network with a 255.255.255.0 mask. Which of the statements below are true of this network? (Select all valid answers) 正确答案： A. There are 254 usable subnets.

D. There are 254 usable hosts per subnet. 反馈： The default subnet mask for Class B is 255.255.0.0. Thus an extra 8 bits have been used for the network portion, leaving 8 for hosts. The 2n -2 formula (28 -2 in this case for both the

network and IP hosts) gives us 254 networks and 254 hosts per network.

测试七

问题 1 Which of the following protocols operate at the Application layer of the OSI model? (Select all valid answers)

正确答案： B. Telnet C. FTP

问题 2 Examine interfaces,and the Ethernet 0 interface status says: Ethernet 0 is up,line protocol is down. What does this indicate?

正确答案： B. There is a data link layer

问题 3 要将光标向后移动一个字，应该使用哪个控制序列? 正确答案： A. ESC-B

问题 4 输入禁用所有debug进程的路由器命令：no debug all 或者undebug all 正确答案：对

问题 5 下列哪个不是第2层设备的3个主要功能之一？正确答案： C. 收听

问题 6 Which of the following devices can an administrator use to segment their LAN? (Choose all that apply)

正确答案： B. Switches C. Bridges D. Routers

问题 7 在用户EXEC 模式中键入e，将出现什么信息? 正确答案： B. % Ambiguous command:

问题 8 如果在用户EXEC模式或特权EXEC 模式中输入一条IOS不认识的命令，交换机和路由器将

正确答案： B. 试图将这条命令解析为IP地址

问题 9 对于哪个交换，交换机读取到帧目的MAC地址的位置，并且随即开始转发此帧。正确答案： B. 直通转发

问题 10 哪条路由器命令将当前的配置保存到NVRAM? 正确答案： D. copy running-config start

问题 11 哪个控制序列将光标移动到某一行的末尾? 正确答案： C. ctrl-e

问题 12 IOS镜像可以从以下位置加载，除了：正确答案： C. NVRAM

问题 13 关于网桥，下列哪项是正确的？正确答案： D. 它们只进行存储转发交换问题 14 关于全双工，下列哪项是正确的？正确答案： D. 使用点对点的连接

问题 15 You have the binary number 10011101. Convert it to its decimal and hexadecimal equiva-lents. (Select two answer choices) 正确答案： B. 0x9D D. 157

问题 16 PDU每隔2秒生成一次。正确答案：对

问题 17 用户将使用哪条路由器命令查看配置寄存器的值？正确答案： D. show version

问题 18 VLAN是专有的Cisco协议，用于在中继连接上共享Cisco交换机之间的VLAN配置信息。

正确答案：错

反馈： VTP中继协议

问题 19 在配置模式中执行了line console 0 命令后。路由器的提示符将会是什么? 正确答案： B. Router(config-line)#

问题 20 在掉电状态下哪种类型的存储器不保留其内容？正确答案： C. RAM

问题 21 There are 2 switches in the Testking LAN, with no routers. Ports 1, 2 & 3 are assigned to VLAN 1 in switch 1 and 2 and ports 4, 5 & 6 are assigned to VLAN 2 in both switches. These two switches are connected together via a trunked link. Which of the conditions below would verify trunk and VLAN operation? (Select all valid answers)

正确答案： A. Host 1 on VLAN 1 can ping Host 2 on VLAN 1 B. Host 4 on VLAN 2 can not ping Host 1 on VLAN 1 C. Host 4 on VLAN 2 can ping Host 2 on VLAN 2

反馈： If there is no router present, only hosts in the same VLAN will be able to ping each other. In order for any host on one VLAN to communicate with a host on another VLAN, the traffic must pass through a router. Host within the same VLAN will be able to ping each other, even though they reside on different switches, as long as the switches have a trunk connection configured between them.

问题 22 哪条路由器命令将回到一个已挂起的telnet会话中？正确答案： C. resume

问题 23 输入设置VTP域为dealgroup的1900系列交换机命令：vtp domain dealgroup 正确答案：对

问题 24 Which of the following statements are true regarding a network using a subnet mask of 255.255.248.0? (Choose three)

正确答案： A. It corresponds to a Class A address with 13 bits borrowed

C. The network address of the last subnet will have 248 in the 3rd octet. D. The subnetwork numbers will be in multiples of 8

问题 25 Routers perform which of the following functions? (Select Three) 正确答案： A. Packet switching C. Packet filtering

D. Internetwork communication

反馈： Routers can permit and deny traffic using layer 3 and layer 4 packet information.The primary purpose of a router is to route traffic between different networks, allowing for in-ternetworking.

问题 26 输入查看CAM表的交换机命令：show mac-address-table 。正确答案：对

问题 27 图中的家庭网络可能用到了哪些设备? 正确答案： A. 100Mbps以太网适配器 B. Category 5 双铰线电缆 C. 以太网集线器

问题 28 哪条命令为2950 系列交换机指定用户EXEC模式口令? 正确答案： A. password

问题 29 怎样进入1900 系列交换机的用户EXEC 模式? 正确答案： C. Enter the letter K 问题 30 程序寻找并加载IOS? 正确答案： B. Bootstrap

问题 31 要查看用户输入的最后几条命令，应该键入哪条命令? 正确答案： D. show history

问题 32 支持多个VLAN的连接称作中继。正确答案：对

问题 33 如何挂起一个telnet会话？正确答案： B. CTRL-SHIFT-6 X

问题 34 The TCP/IP network model differs from the more popular OSI model. Which of the layers below belong to the TCP/IP model? (Select all that apply) 正确答案： A. Application layer C. Transport layer D. Internet layer

反馈： The architecture of TCP/IP does not use the 6and 5layers. The application layer pro-tocols use the transport layer services directly. The OSI transport layer provides connec-tion-oriented service; in TCP/IP, this service is provided by TCP.

问题 35 哪条命令为2950 系列交换机指定默认网关? 正确答案： D. (config)# ip default-gate

测试八

问题 1 The two connected ports on the switch are not turning orange or green. What would be the most effective steps to troubleshoot this physical layer problem? (Choose three) 正确答案： B. Ensure that cables A and B are straight-through cables. C. Ensure that switch has power. D. Reseat all cables.

问题 2 何种类型的流量被送往一组设备？正确答案： A. 组播

问题 3 哪条2950系列交换机命令启用中继？正确答案： A. switchport mode trunk

问题 4 TestKing is concerned about unauthorized access to the Payroll Server. The Accounting1, CEO, Mgr1, and Mgr2 workstations should be the only computers with access to the Payroll Server. What two technologies should be implemented to help prevent unauthorize? 正确答案： A. Access lists D. VLANs

反馈： Layer 2 switched networks are typically designed as flat networks from a broadcast perspective. Every broadcast packet that is transmitted is seen by every device on the network, regardless of whether the device needs to receive that data or not. 问题 5 有关处于收听状态的端口，下列哪项是正确的？正确答案： A. 它在收听状态中停留15秒问题 6 下面关于802.1Q哪个是正确的？

正确答案： A. 它支持集线器连接

问题 7 哪条2950系列交换机命令向接口分配VLAN? 正确答案： C. switchport access vlan

问题 8 下列哪个不是第2层设备的3个主要功能之一？正确答案： C. 收听

问题 9 哪种VTP模式会传播VTP消息？正确答案： C. 客户、服务器和透明

问题 10 输入设置VTP模式为服务器的交换机命令：vtp server 正确答案：对

问题 11 下面关于VLAN哪个是错误的？正确答案： C. VLAN是位置相关的

问题 12 在学习功能运行的时候，交换机将地址和端口置于下面哪个表中。正确答案： C. CAM

问题 13 CDP is running between two TestKing devices. What information is supplied by CDP? (Se-lect three)

正确答案： A. Device Identifiers B. Capabilities list C. Platform

问题 14 The TestKing network is displayed in the diagram below: Referring to the devices shown above, which statements are true in this scenario? (Select two)

正确答案： B. Only the device in network 192.168.1.0 will receive a broadcast to 255.255.255.255 sent by TestkingA

C. Each host is in a separate collision domain

问题 15 Which Layer 1 devices can be used to extend the area covered by a single LAN segment? (Select two) 正确答案： A. hub

B. Repeater

问题 16 被选定为某个网段转发流量的交换机端口称为? 正确答案： A. 根端口

问题 17 VTP服务器交换机每几分钟生成一次汇总通告。正确答案： D. 5

问题 18 Regarding the extended ping command; which of the statements below are true? (Select all valid answer choices)

正确答案： A. The extended ping command is available from privileged EXEC mode. B. With the extended ping command you can specify the timeout value. C. With the extended ping command you can specify the datagram size. 问题 19 哪条1900系列交换机的命令启用端口安全措施？正确答案： C. port secure 问题 20 BPDU代表下面哪个?

正确答案： B. Bridge Protocol Data Unit

问题 21 输入在fa0/26上查看中继状态的1900系列交换机命令：show trunk A 。正确答案：对

问题 22 下面关于ISL哪个是正确的？正确答案： D. 原始以太帧没有被修改

问题 23 1900系列交换机支持多少个VLAN。正确答案： C. 64

问题 24 何种类型的流量不被泛洪？正确答案： B. 已知的单播

问题 25 哪个协议在不同自治系统间路由。正确答案： B. EGP

问题 26 With regards to bridges and switches, which of the following statements are true? (Choose three)

正确答案： A. Both bridges and switches forward Layer 2 broadcasts.

B. Switches typically have a higher number of ports than bridges.

C. Both bridges and switches make forwarding decisions based on Layer 2 addresses. 反馈： B, F: Both are layer 2 (data link) devices designed to forward layer 2 broadcasts and multicast ad-dresses. D: Switches do have more ports than bridges. Bridges normally use two ports to bridge LANs to-gether while switches typically come in 24 or 48 ports

问题 27 使用什么子网掩码来设置默认路由？正确答案： A. 0.0.0.0

问题 28 根交换器是由下面哪个选举出来的? 正确答案： C. 最低交换机ID

问题 29 输入允许路由选择协议接受非一致子网掩码路由的命令，如默认路由：ip classless 。正确答案：对

问题 30 输入创建名称为test的VLAN 2的1900系列交换机命令：vlan 2 name test 。正确答案：对

问题 31 配置单臂路由器时，在哪个接口上进行配置。正确答案： C. 子接口

问题 32 路由器运行着RIP和OSPF，并且两种路由选择协议都在学习192.168.1.0/24。路由器将对该路由使用OSPF。正确答案：对

问题 33 输入设置到192.168.1.0/24的静态路由的命令，下一跳地址是192.168.2.2：ip route 192.168.1.0 255.255.255.0 192.168.2.2

正确答案：对

问题 34 在网络中使用ISL中继并配置了5个VLAN。有多少个VTP范例在运行？正确答案： A. 1

问题 35 Within the TestKing office, The Sales and Production networks are separated by a router as shown in the diagram below: Which of the following statements most accurately describes the characteristics of the above networks broadcast and collision domains? 正确答案： A. There are two broadcast domains in the network. D. There are seven collision domains in the network.

反馈： In this network we have a hub being used in the Sales department, and a switch being used

in the Production department. Based on this, we have two broadcast domains: one for each network being separated by a router. For the collision domains, we have 5 computers and one port for E1 so we have 6 collision domains total because we use a switch in the Production Department so 5 are created there, plus one collision domain for the entire

Sales department because a hub is being used. 问题 36 下面哪个是可路由协议?

正确答案： D. 既不是RIP也不是OSPF

测试九

问题 1 At which layer of the OSI model is the optimal path to a network destination determined at?

正确答案： D. Network

问题 2 What command verifies connectivity between two hosts by sending and receiving ICMP echo messages?

正确答案： A. ping

问题 3 You have a class C network, and you need to design it for 4 usable subnets with each subnet handling a minimum of 17 hosts each. Which of the following network masks should you use?

正确答案： A. 255.255.255.224

问题 4 The IP network 210.106.14.0 is subnetted using a /27 mask. How many usable networks and host addresses can be obtained from this?

正确答案： D. None of the above

问题 5 How would the number 239 be expressed as a binary number? 正确答案： D. 11101111

问题 6 Which one of the binary number ranges shown below corresponds to the value of the first octet in Class B address range?

正确答案： C. 10000000-10111111

问题 7 Which router IOS commands can be used to troubleshoot LAN connectivity problems? 正确答案： A. Ping

问题 8 telnet 工作在第几层? 正确答案： A. Layer 7

问题 9 All of the hosts in the above exhibit are connected with each other via the single Catalyst switch. Which of the following statements correctly describe the addressing scheme of this network? (Select three)

正确答案： B. The subnet mask in use is 255.255.255.128.

C. The IP address 172.16.1.25 can be assigned to hosts in VLAN1.

D. The LAN interface of the router is configured with multiple IP addresses. 反馈： Based on the diagram above, the subnet mask used for each VLAN is 255.255.255.128. This means that hosts in VLAN 1 will be addressed 172.16.1.1-172.16.1.126, with 172.16.1.127 being used as the broadcast address. Hosts in VLAN 2 will be addressed 172.16.1.129-172.16.1.254

问题 10 If a host on a network has the address 172.16.45.14/30, the host's ip address 172.16.45.0 belongs to the subnetwork. 正确答案：错

问题 11 A network administrator needs to verify that switch interface 0/5 has been assigned to the Sales VLA.N. Which command will accomplish this task? 正确答案： A. Show vlan

问题 12 Which of the following statements are true regarding a network using a subnet mask

of 255.255.248.0? (Choose three)

正确答案： A. It corresponds to a Class A address with 13 bits borrowed.

B. The network address of the last subnet will have 248 in the 3rd octet. C. The subnetwork numbers will be in multiples of 8.

反馈： This subnet mask includes the first 5 bits within the third octet, so for a class A address 13 bits will be used for the mask (8 bits in the second octet plus 5 in the third). Since the first 5 bits are used in this octet, that means that remaining 3 bits

问题 13 Given that you have a class B IP address network range, which of the subnet masks below will allow for 96 subnets with 501 usable host addresses per subnet?

正确答案： C. 255.255.254.0

问题 14 Which one of the binary number ranges shown below corresponds to the value of the first octet in Class A address range?

正确答案： A. 00000000-01111111

问题 15 The Testking.com network is displayed in the diagram below: Based on the diagram above, Three collision domains are present in the TestKing.com network. 正确答案：错

反馈： Since hubs are being used for both Ethernet segments, there are a total of two collision domains. Routers do not forward broadcast and are used to segment LANs, so TestKingA consists of one collision domain while TestKingB consists of the second collision

问题 16 16 networks and 14 hosts are available per subnet if you apply a /28 mask to the 210.10.2.0 class C network. 正确答案：对

问题 17 ISO/OSI分几层. 正确答案： D. 7

问题 18 Which of the following IP addresses is a private IP address? Select all that apply. 正确答案： C. 172.20.14.36 D. 192.168.42.34

问题 19 You have a Class C network, and you need ten subnets. You wish to have as many addresses available for hosts as possible. Subnet masks 255.255.255.240 you should use. 正确答案：对

问题 20 Topologies have two types. 正确答案：对

问题 21 To configure the VLAN trunking protocol to communicate VLAN information between two switches, what requirements must be met?

正确答案： B. The VTP management domain name of both switches must be set the same. 问题 22 Which of the protocols below, operates at Layer 2 of the OSI model, and is used to maintain a loop-free network? STP (spanning tree protocol) operates on layer 2 to prevent loops in switches and bridges. 正确答案： B. STP

问题 23 The Testking.com network is displayed in the diagram below: Based on the diagram above, Four collision domains are present in the TestKing.com network. 正确答案：错

反馈： Since hubs are being used for both Ethernet segments, there are a total of two collision domains. Routers do not forward broadcast and are used to segment LANs, so TestKingA consists

of one collision domain while TestKingB consists of the second collision

问题 24 A TestKing PC has the IP address 172.16.209.17/22. What is the subnet of this address? 正确答案： C. 172.16.208.0

问题 25 You are the network administrator at TestKing. TestKing has been provided with the network address 163.10.20.0/24. How many subnetworks this address provides, and how many hosts can be supported on each subnet.Which would your reply be? 正确答案： A. One network with 254 host

问题 26 The 213.115.77.0 network was subnetted using a /27 subnet mask. How many usable subnets and host addresses per subnet were created as a result of this?

正确答案： A. 6 networks with 30 hosts

问题 27 In the \"host to host\" layer of the DOD model, which of the following is a valid connection oriented protocol?

正确答案： C. TCP

问题 28 You have a single Class C IP address and a point-to-point serial link that you want to implement VLSM on. Which subnet mask is the most efficient? 正确答案： A. 255.255.255.252

问题 29 Which of the following IP hosts would be valid for PC users, assuming that a /27 network mask

? (Choose all that apply.)

正确答案： B. 83.121.178.93 C. 134.178.18.56 D. 192.168.19.37

反馈： With a 255.255.255.224 network mask, the network boundaries will be a multiple of 32, so any network will have a multiple of 32 (32, 64, 96, 128, 160, 192, 224) in the last octet. If we subtract 1 from each of these numbers (so we have 31, 63, 95, etc), ...

问题 30 ping 工作在第几层? 正确答案： C. 3

问题 31 Which of the following IP addresses for the network 27.35.16.32/28 can be assigned to hosts? (Choose three)

正确答案： B. 27.35.16.33 C. 27.35.16.45 D. 27.35.16.44

问题 32 In the network diagram, what are the broadcast addresses of the subnets? (Select three)

正确答案： B. 172.16.95.255 C. 172.16.47.255 D. 172.16.79.255

反馈： The subnets in the network are subnetted Class B addresses. A /20 subnet mask means that the subnet addresses increment by a factor of 16. For example: 172.16.16.0, 172.16.32.0, 172.16.48.0, 172.16.64.0 etc. The broadcast address is the last IP address ...

问题 33 You've been assigned the CIDR (classless inter domain routing) block of 115.64.4.0/22 from your ISP. Which of the IP addresses below can you use for a host? (Select all valid answers) 正确答案： A. 115.64.7.64 B. 115.64.6.255

问题 34 Which OSI layer is associated with the following: The acknowledgement of transmissions, sequencing, and flow control across a network? 正确答案： C. Layer 4

问题 35 172.31.128.255./18 is an example of a valid unicast host IP address. 正确答案：对

问题 36 The TestKing network was assigned the Class C network 199.166.131.0 from the ISP. If the administrator at TestKing were to subnet this class C network using the 255.255.255.224 subnet mask, 30 hosts they will be able to support on each subnet.

正确答案：对

问题 37 Which of the following IP addresses fall into the CIDR block of 115.54.4.0/22? Select three.

正确答案： A. 115.54.7.64 B. 115.54.6.255 D. 115.54.5.128

问题 38 The subnet mask on the serial interface of a router is expressed in binary as 11111000 for the last octet. How do you express the binary number 11111000 in decimal? 正确答案： D. 248

测试十

问题 1 A TestKing Switch is connected as shown below: Which IOS commands should you enter if you wanted to link the router TestKing1 with switch port 1? (Select three answer choices) 正确答案： A. Switch(config)# interface fastethernet 0/1 C. Switch(config-if)# switchport mode trunk

D. Switch(config-if)# switchport trunk encapsulation dot1q

反馈： Before you can begin, you have to get into the interface. Answer choice A is the only command in the selection that puts the IOS into interface mode. Once in the interface you have to set it to trunk mode, so choice C is correct.

问题 2 You are an administrator and you've just configured OSPF on a router with both physical and logical interfaces. Which of the following factors determine the router ID? 正确答案： C. The highest IP address of any logical interface

反馈： When the OSPF process starts, the Cisco IOS uses the highest local active IP address as its OSPF router ID. If there is no active interface, the OSPF process will not start. If the active interface goes down, the OSPF process has no router ID and therefore...

问题 3 The TestKing switches shown in the diagram, Core and Core2, are both Catalyst 2950s. The addressing scheme for each company site is as follows: Router Ethernet port - 1st usable address Core - 2nd usable address Core2 - 3rd usable address For this network, which of the following commands must be configured on Core2 to allow it to be managed remotely from any subnet on the network? (Choose three)

正确答案： A. Core2(config)# ip default-gateway 192.168.1.9

B. Core2(config)# interface vlan 1 Core2(config-if)# ip address 192.168.1.11 255.255.255.248

C. Core2(config)# line vty 0 4 Core2(config-line)# password cisco

反馈： IP default-gateway address is a global command that sets the default gateway so that the

management interface can be reached from a remote network. This is the correct command used on Cisco switches. In order to be reachable, the IP address of VLAN 1 must also be specified and must be in the same subnet as the default gateway IP address. Finally, in order to remotely connect via telnet to any Cisco device the password must e

set or you will get a \"password required, but none set\" error message when you try to telnet to it. 问题 4 What is the default configuration register setting on most Cisco routers? 正确答案： D. 0x2102

反馈： About 99 percent of the time someone uses a config-register, it's more than likely because of a lost router password. Normally, the two config-registers for recovering passwords are 0x2102 and 0x2142.

问题 5 What is the reason for configuring a passive interface on a router?

正确答案： D. Allows a router to receive routing updates on an interface but not send updates via that inter-face

问题 6 Which interface commands would you enter on a Catalyst 2900 switch, if your goal was to bring all VLAN traffic to another directly connected switch? (Select the two valid responses) 正确答案： C. Switch(config-if)# switchport access vlan all D. Switch(config-if)# switchport mode trunk

反馈： In order to pass all VLAN traffic from one switch to another, a trunk is needed. In order to configure a trunk on a 2900 series switch, only these two commands are required.

问题 7 On the topic of the OSPF hello protocol; which of the statements below are true? (Select two answer choices)

正确答案： A. The OSPF Hello protocol provides dynamic neighbor discovery C. The OSPF Hello protocol maintains neighbor relationships

问题 8 What are the possible trunking modes for a switch port? (Choose three) 正确答案： B. Auto C. On

D. Desirable

问题 9 The following statements explains the split horizon rule: Information about a route should never be sent back in the direction from which the original update came. 正确答案：对

问题 10 You work as a network engineer at TestKing.com. You are required to allow establishment of a Telnet session with a router TestKingC. You will enter: TestKingC(config)# line vty 0 TestKingC(config-line)# password testking TestKingC(config-line)# login 正确答案：对

问题 11 What is the maximum number of hops OSPF allows before it deems a network unreachable?

正确答案： D. Unlimited

问题 12 Which of the commands below would you enter if you wanted to see the configuration register of your router? 正确答案： D. show version

问题 13 A TestKing.com technician is troubleshooting connectivity problems between two routers that are directly connected through the serial line. The technician notices that the serial line is up but cannot see any neighbors displayed in the output of the show ccdp neighbors command. In which OSI layer is the problem most likely occurring?

正确答案： B. Data link

反馈： As the question states that serial line is up, it means the problem is not on the Network layer. The administrator cannot see any output by issuing the show cdp neighbors

command. It means that CDP is disabled and CDP is a protocol that runs over Layer2 (the data link layer) on all Cisco routers, bridges, access servers, and switches.

问题 14 As a TestKing trainee you are required to set the default gateway on a Cisco switch to the IP address of 192.168.1.115. Which IOS command should you use? 正确答案： B. TestKSwitch(config)# ip default-gateway 192.168.1.115

反馈： Use the \"ip default-gateway\" command to enter the IP address of the next-hop router interface that is directly connected to the switch where a default gateway is being configured. The default gate-way receives IP packets with unresolved destination IP addr ...

问题 15 What are the characteristic of link state routing protocols? (Choose all that apply.) 正确答案： A. The exchange of advertisement is triggered by a change in the network C. Packets are routed based upon the shortest path to the destination

D. Every router in an OSPF area is capable of representing the entire network topology

反馈： OSPF Each router discovers its neighbors on each interface. The list of neighbors is kept in a neighbor table. Each router uses a reliable protocol to exchange topology information with its neighbors. Each router places the learned topology informatio ...

问题 16 Refer to the exhibit below. A TestKing technician wants to upload a new IOS in the router while keeping the existing IOS. What is the maximum size of an IOS file that could be loaded if the original IOS is also kept in flash?

正确答案： A. 4 MB

问题 17 A host computer has been correctly configured with a static IP address, but the default gateway is incorrectly set. Which layer of the OSI model will be first affected by this con-figuration error?

正确答案： C. Layer 3

问题 18 On the assumption that every OSPF router in a particular area is configured with the same priority value; which secondary value would be used as a router ID when there is no loop-back interface set?

正确答案： C. The highest IP address among its active interfaces

反馈： Ordinarily the loopback interface would be selected as the router ID. In the event that no loopback interface is configured, the router ID will be the first active interface that comes up on the router.

问题 19 Which of the following commands displays the configurable parameters and statistics of all interfaces on a router?

正确答案： A. show interfaces

反馈： Use the show interfaces EXEC command to display statistics for all interfaces configured on the router or access server. The resulting output varies, depending on the network for which an interface has been configured.

问题 20 What is the purpose of using the copy flash tftp command on a router? 正确答案： B. To create a backup copy of the IOS

反馈： When upgrading the IOS on a router, if there is enough space to copy the system image file, then the original one can be retained and the new file can be copied in the additional

memory space. If there is not enough space available, as in this case, then the existing file from the Flash is erased while downloading a new one. It is a good practice to backup the existing system image to the TFTP server using the \"copy flash tftp\" command.

问题 21 Refer to the graphic. Although the console password was set to \"testking\in the router configuration as shown. What command caused the password to be stored like this? 正确答案： D. TestKing1(config)# service password-encryption

反馈： Line passwords, appear in clear text in the configuration text file. You can use the service password-encryption command to make them more secure. Once this command is entered, each password configured is automatically encrypted and thus rendered illegible ...

问题 22 Refer to the exhibit. A technician has installed SwitchB and needs to configure it for remote access from the management workstation connected to SwitchA. Following set of commands will accomplish this task. SwitchB(config)# ip default-gateway 192.168.8.254 SwitchB(config)# interface vlan 1 SwitchB(config-if)# ip address 192.168.8.252 255.255.255.0 SwitchB(config-if)# no shutdow

正确答案：对

问题 23 Two TestKing routers are connected together as shown in the diagram below: You work as a network administrator at TestKing.com. You attempt to telnet from the console port on Router TestKing1 to 192.1.2.65. The Telnet connection is unsuccessful. However, a ping to 192.1.2.65 is successful.

What could cause this problem? (Select two) 正确答案： A. access control list filtering D. missing VTY password

反馈： Since a ping to 192.1.2.65 is successful we can eliminate IP configuration being incorrect,however a telnet session is not successful could indeed be because the vty password is not set or missing.To be able to telnet to the router you need the set the telnet with \"line vty 0 4\" command.Also, C is correct because an access list that was placed on the router could be configured to deny the telnet traffic, while at the same time permitting ICMP ping traffic. 问题 24 A routing table contains static, RIP, and IGRP routes destined to the same network and network mask; with each set to its default administrative distance. Which route will it take? 正确答案： The static route

反馈： To decide which route to use, IOS uses a concept called Administrative Distance. Administrative distance is a number that denotes how believable an entire routing protocol is on a single router. The lower the number, the better, or more believable the rout ...

问题 25 During the boot sequence, a TestKing 2600 series router needs to locate and load an operat-ing system. What is the default order the router uses to find an operating system? 正确答案： B. Flash, TFTP server, ROM 反馈： Booting up the Router: Cisco routers can boot Cisco IOS software from these locations: 1. Flash memory 2. TFTP server 3. ROM (not full Cisco IOS)

问题 26 Refer to the exhibit. C-router is to be used as a \"router-on-a-stick\" to route between the VLANs. All the interfaces have been properly configured and IP routing is operational. The hosts in the VLANs have been configured with the appropriate default gateway. What can be said about this configuration? 正确答案：对

问题 27 An administrator would like to configure a switch over a virtual terminal connection

from locations outside of the local LAN. Which of the following are required in order for the switch to be configured from a remote location? (Choose two)

正确答案： A. The switch must be reachable through a port connected to its management VLAN

D. The switch must be configured with an IP address, subnet mask, and default gateway

反馈： In order the telnet to any Cisco device, the device must be reachable from the remote location. For a Cisco switch to be reachable from remote locations, it must have an IP address, subnet mask, and default gateway assigned. Communication with the switch ...

问题 28 You are logged into a router and with to view the layer 3 information about your neighbor-ing Cisco routers. What IOS command gives layer 3 information for of the directly con-nected router interfaces?

正确答案： B. show cdp neighbor

问题 29 You are the administrator of the Testking network and you have forgotten the password to one of your routers. After completing the password recovery procedure the router returned to its normal operation. The config-register was set back to the initial default value. What is this value?

正确答案： C. 0x2102

反馈： The config-register's default factory setting is 0x2102.

问题 30 Which layer of the OSI reference model is responsible for ensuring reliable end-to-end de-livery of data?

正确答案： D. Transport

问题 31 What determines the IOS that the router will load?

正确答案： D. The configuration register and boot system commands

反馈： Cisco routers can boot Cisco IOS software from these locations: 1. Flash memory 2. TFTP server 3. ROM (not full Cisco IOS)

问题 32 Under which circumstance, i.e. network type, would an OSPF router establish a neighbor adjacency, even though the DR/BDR election process was not performed? 正确答案： A. Point-to-point

反馈： If there's a point to point connection, there's no need for a designated router or a backup desig-nated router election. By definition, only two routers exist on a point to point connection. 问题 33 The Testking WAN is displayed in the diagram below: You have just added the router TestKing1 to your network and wish it to have full connec-tivity with routers TestKing2 and Testking3. The following configurations would suit TestKing1. TestKing1(config)# router rip

TestKing1(config-router)# network 10.0.0.0 TestKing1(config-router)# network 172.16.0.0 正确答案：对

问题 34 While logged into a router you manually shut down the serial 0 interface using the \"shut-down\" interface configuration command. You then issue the \"show interface serial 0\" command in exec mode. What could you expect the status of the serial 0 interface t 正确答案： C. Serial 0 is administratively down, line protocol is down

问题 35 When you power up a Cisco router; in what memory is the start-up configuration normally stored in?

正确答案： A. NVRAM

问题 36 You download a file from an FTP site on the Internet. What is the highest layer in the OSI model used in this FTP operation? 正确答案： A. Application

问题 37 Which statement is correct about the internetwork shown in the diagram? 正确答案： D. If Fa0/0 is down on Router 1, Host A cannot access Testking1

反馈： In the Figure three different VLANs are created, with router1 playing a major role for inter-VLAN routing. IF fa0/0 interface will down host A can't access the testking1 host because any packets for different VLAN should go through the fa0/0 of router1 ...

问题 38 A Catalyst 2950 needs to be reconfigured. What steps will ensure that the old configuration is erased? (Choose three) 正确答案： B. Restart the switch

C. Delete the VLAN database

D. Erase the startup configuration

反馈： For switches such as the 2950, the process is much the same as a router, but you should delete the VLAN.DAT file before reloading the router. This file contains VLAN information and is kept in flash, so it will still be present after a reload.

问题 39 A routing table contains static, RIP, and IGRP routes destined to the same network with each route set to its default administrative distance. Which route will be the preferred route?

正确答案： B. The static route

反馈： To decide which route to use, IOS uses a concept called Administrative Distance. The administra-tive distance is a number that denotes how believable an entire routing protocol is on a single router. The lower the number, the better, or more believable the...

问题 40 Refer to the graphic. A network associate is planning to copy a new IOS image into the Paden router. This new image requires 8 MB of flash memory and 32 MB of RAM. How will the IOS proceed with the copy process?

正确答案： A. The new IOS will be copied into flash memory and the current image will remain

反馈： According to the output shown above, the existing IOS is 8760520 bytes (8M) and the total size of the flash on this device is 24567K (24M). The new IOS only requires an additional 8 MB, so it will be copied on to the flash directly and both images will res ...

问题 41 What will cause a TestKing router to enter setup mode? (Choose two) 正确答案： A. The configuration file is missing in NVRAM.

D. The setup command was issued from the privileged mode prompt. 反馈： When router boots up, it checks the valid configuration into NVRAM and tries to load the con-figuration. If there is not configuration router automatically goes into setup dialog. From setup dialog, you able to configuration the basic configuration.

问题 42 While troubleshooting a connectivity problem on the network, you issue the ping command from your PC command prompt, but the output shows \"request times out.\" At which OSI layer is this problem associated with? 正确答案： D. The network layer

练习11

问题 1 Based on this diagram, which of the following is true?

正确答案： C. If Fa0/0 is down on Router 1, Host A cannot access Server 1.

问题 2 You have a single Class C IP address and a point-to-point serial link that you want to im-plement VLSM on. Which subnet mask is the most efficient?

正确答案： D. 255.255.255.252

问题 3 A TestKing PC has the IP address 172.16.209.10 /22. What is the subnet of this address? 正确答案： C. 172.16.208.0

问题 4 How do you express the binary number 10110011 in decimal form? 正确答案： C. 179

问题 5 Using a Class C IP network, which subnet mask will provide one usable subnet per depart-ment while allowing enough usable host addresses for each department specified in the graphic?

正确答案： C. 255.255.255.224

问题 6 The 201.145.32.0 network is subnetted using a /26 mask. How many networks and IP hosts per network exists using this subnet mask? 正确答案： C. 4 networks and 62 hosts

问题 7 If an Ethernet port on router was assigned an IP address of 172.16.112.1/20, what is the maximum number of hosts allowed on this subnet?

正确答案： C. 4094

问题 8 The corporate LAN shown in the TestKing network uses IP network 172.28.4.0/22 for all departments. All workstations use 172.28.4.1 as a default gateway address. Network admin-istrators have recently become concerned that excessive broadcasts are slowing network performance. Which change is most likely to reduce broadcast traffic on the corporate LAN? 正确答案： D. Implement VLANs after creating IP subnets for each department.

问题 9 On the topic of VLSM, which one of the following statements best describes the concept of the route aggregation?

正确答案： B. Combining routes to multiple networks into one supernet.

反馈： In the networking world route aggregate means combining routes to multiple networks into one. This is also known as route summarization or supernetting. It is normally used to reduce the number of route entries in the routing table by advertising numerous...

问题 10 You work as network consultant. Your customer, TestKing Inc, has a class C network license. TestKing wants you to subnet the network to provide a separate subnet for each of its 5 de-partments. Each subnet must support at least 24 hosts. Which network mask will be use? 正确答案： B. 255.255.255.224

问题 11 If a host on a network has the address 172.16.45.14/30, what is the address of the subnetwork to which this host belongs? 正确答案： D. 172.16.45.12

问题 12 Which one of the following varieties of NAT utilizes different ports to map multiple IP ad-dresses to a single globally registered IP address? 正确答案： C. NAT Overloading

反馈： Port address translation, or NAT overloading, uses transport layer port information to dynamically create NAT entries. This is also known as one to many network address translation. 问题 13 How would you express the binary number: 10101010 in its decimal and hexadecimal forms?

正确答案： B. Decimal=170, hexadecimal=AA

问题 14 Given that you have a class B IP address network range, which of the subnet masks below will allow for 100 subnets with 500 usable host addresses per subnet?

正确答案： C. 255.255.254.0

问题 15 The TestKing network is displayed in the following diagram: Based on the diagram shown above, which of the devices shown can transmit simultaneously without causing collisions?

正确答案： B. Only hosts attached to the switch

反馈： Unlike hubs, a switch is the device which is used to avoid collisions. When two computers communicate through a switch they make their own collision domain. So, there is no chance of colli-sions. Whenever a hub is included, it supports on half duplex communicate

问题 16 Two buildings on the San Jose campus of the TestKing network must be connected to use Ethernet with a bandwidth of at least 100 Mbps. The company is concerned about possible problems from voltage differences between the two buildings. Which media type should be used for the connection?

正确答案： C. Fiber optic cable

问题 17 Given the choices below, which address represents a unicast address? 正确答案： D. 172.31.128.255/18

问题 18 How many usable IP addresses can you get from a conventional Class C address? 正确答案： C. 254

反馈： Class Caddresses range from 192.0.0.0 through 223.225.225.225 and default subnet maskof 255.255.255.0. In Class C addresses, the first 24 bits are used as for the network IDwhile only the last 8 bits is used for the host ID. Using the 2n-2 formula, we can ...

问题 19 What is the network address for a host with the IP address 201.100.5.68/28? 正确答案： C. 201.100.5.64

问题 20 Your TestKing trainee Bob asks you what 11111001 binary is in decimal. What should you tell him?

正确答案： D. 249

问题 21 You are the network administrator at TestKing. TestKing has been provided with the network address 165.100.27.0/24. The TestKing CEO wants to know how many subnetworks this address provides, and how many hosts can be supported on each subnet. What would your reply be? (Choose all that apply)

正确答案： A. One network with 254 hosts.

问题 22 The IP network 210.106.14.0 is subnetted using a /24 mask. How many usable

networks and host addresses can be obtained from this?

正确答案： A. 1 network with 254 hosts

反馈： A subnet with 24 bits on would be 255.255.255.0. Since this is a class C network, this subnet can have only 1 network and 254 usable hosts.

问题 23 You are the network administrator at TestKing. TestKing has been assigned the class C IP address 189.66.1.0 by its Internet Service Provider. If you divide the network range by using the 255.255.255.224 subnet mask, how many hosts can be supported on each ? 正确答案： C. 30

问题 24 Two TestKing devices are connected as shown below: How many broadcast domains are shown in the graphic assuming only the default VLAN is con-figured on the switches?

正确答案： A. One

问题 25 The 213.115.77.0 network was subnetted using a /28 subnet mask. How many usable subnets and host addresses per subnet were created as a result of this?

正确答案： D. None of the above

问题 26 The MAC address for your PC NIC is: C9-3F-32-B4-DC-19. What is the address of the OUI portion of this NIC card, expressed as a binary number?

正确答案： D. 11001001-00111111-00110010

问题 27 Refer to the exhibit shown below. What is needed to allow host A to ping host B? 正确答案： A. a backbone switch connecting the switches with either fiber optic or straight-through cables

问题 28 You have a class C network, and you need to design it for 5 usable subnets with each subnet handling a minimum of 18 hosts each. Which of the following network masks should you use?

正确答案： D. 255.255.255.224

问题 29 Study the Exhibit carefully. What switch functionality will prevent Layer 2 broadcasts from mov-ing between the networks shown?

正确答案： A. VLAN

问题 30 You have a network that supports VLSM and you need to reduce IP address waste in your point to point WAN links. Which of the masks below would you use? 正确答案： B. /30

练习12

问题 1 The Testking Corporation consists of the head office in New York with its regional offices in: Chicago, Detroit, Philadelphia, Toronto, and Atlanta. These offices need to be connected in a WAN, and Testking wishes to do this via a hub and spoke arrangement that will utilize packet-switched technology. 正确答案： C. Frame Relay

反馈： To provide efficient IP multicast support in Frame Relay networks, the underlying Frame Relay network architecture should be designed in a \"hub and spoke\" topology

(hierarchical topology). The hub and spoke topology is also named a \"star\" topology,

network that greatly reduces the resource requirements of the central router, allowing the Frame Relay network to utilize the advantages of IP multicast applications.

问题 2 What is the reason for configuring a passive interface on a router?

正确答案： D. Allows a router to receive routing updates on an interface but not send updates via that inter-face

问题 3 Assume that RIP v1 is the only routing protocol in use. What is the Maximum number of usable IP address that can be supported on each LAN if the TestKing network is using one Class C address block?

正确答案： A. 14

问题 4 A network administrator is designing a Cisco network for a large company. The network must be able to use minimal bandwidth for routing updates, converge quickly, and support VLSM, CIDR, IP and IPX. Which routing protocol will best fit the requirements of this network? 正确答案： D. EIGRP

问题 5 Which sequence of actions will allow telnet traffic from a user's PC to a router using TCP/IP?

正确答案： D. Connect the PC's Ethernet port to the router's Ethernet port using a crossover cable. 反馈： A crossover cable is used to directly connect a switch to a switch, a hub to a hub, a host to a host, or a host's Ethernet port to a router's Ethernet interface. If your Router's interface is configured with IP addressing and telnet service is ...

问题 6 You are given a PC, a router, and a cable. Select the correct combination that will allow you to log into the router locally using a terminal emulation program such as HyperTerminal. 正确答案： B. Connect the PC's COM port to the router's console port using a rollover cable. 反馈： To connect the Router in Console port to configure using HyperTerminal, you required the Roll-over Cable, which connects the PC's COM port to the router's Console port. 问题 7 The TestKing network is replacing all of their hubs with new switches. How does a switch differ from a hub?

正确答案： A. A switch operates at a lower, more efficient layer of the OSI model.

问题 8 What is the maximum number of hops OSPF allows before it deems a network unreachable?

正确答案： D. Unlimited

问题 9 You are the administrator of the Testking network and you have forgotten the password to one of your routers. After completing the password recovery procedure the router returned to

its normal operation. The config-register was set back to the initial default value. What is this value?

正确答案： C. 0x2102

问题 10 What parameters must you specify when you enable EIGRP routing? 正确答案： D. EIGRP routing, network number, and AS

反馈： To enable EIGRP on your router, you must specify EIGRP routing, the network number, and the AS system number.

问题 11 The TestKing network is implementing dialup services for their remote employees. TestKing uses several different Layer 3 protocols on the network. Authentication of the users con-necting to the network is required for security. Additionally, some employees will be dialing long distance and will need callback support.Which protocol is the best choice for these remote access services?

正确答案： D. PPP

反馈： PPP is the Point to Point Protocol, and is used in the majority of dial-up connections. PPP includes support for numerous features, including caller ID check, PPP callback, and security support. For security, either CHAP or PAP can be used, although CHAP is normally used as it is more secure. PPP is a layer 2 protocol that can support any layer 3 protocols.

问题 12 The TestKing network consists of a small office with twenty-five employees that has one connection to the Internet through the TK1 router. What routing configurations are recom-mended on the TK1 and ISP routers?

正确答案： D. A default route on TK1 and a static route on the ISP router.

问题 13 You are a systems administrator of an HR company in Dallas. You want to connect your company's head office with a branch office in Detroit. To do this, you want to use two data link layer encapsulations: one exclusively for data and the other exclusively for signaling. Which one of the following WAN services would best suit your needs?

正确答案： A. ISDN

问题 14 After the router interfaces shown in the diagram have been configured, it is discovered that hosts in the Branch LAN cannot access the Internet. Further testing reveals additional con-nectivity issues. What will fix this problem?

正确答案： B. Change the address of the Branch router WAN interface.

问题 15 You are a network administrator of a small company that's experiencing explosive growth. The company is going to open up seven more regional offices with the potential of more in the future. These regional offices send and receive mission critical traffic, and will need to be connected to the head office around the clock. However, your head office doesn't have any additional free ports available on the router. Which of the following technologies would be the best choice for this new WAN? 正确答案： A. Frame Relay

问题 16 TestKing has four offices, each with its own network, as shown in the graphic. Three of the networks have approximately 50 hosts each, and one network has 10 hosts. The multi-vendor routers are connected by serial links that use separate subnetwork numbers.The TestKing network has leased one Class C address to be used for all networks and serial links, and they do

not wish to replace any of their existing routers.Which routing protocol would be most appropriate for this scenario? 正确答案： A. RIP version 2

问题 17 Which command will configure a default route on a router? 正确答案： D. router(config)# ip route 0.0.0.0 0.0.0.0 10.1.1.1

问题 18 Which of the commands below would you enter if you wanted to see the configuration register of your router? 正确答案： D. show version

问题 19 TestKing.com is merging with several local businesses that use routers from multiple vendors. Which routing protocol would work best to connect TestKing.com with the enterprise networks it has acquired by providing scalability and VLSM support while minimizing network overhead?

正确答案： A. OSPF

问题 20 You need to implement the use of a routing protocol that meets the following requirements: 1. Converges quickly 2. Supports VLSM, CIDR, IP, and IPX. 3. Uses minimal bandwidth for routing updates. Which one of the following routing protocols would be the best choice?

正确答案： A. EIGRP

反馈： EIGRP would be the best choice as it provides support for VLSM and CIDR, has faster conver-gence times than other protocols, is scalable, and supports IP, IPX, and Appletalk. EIGRP is a Cisco proprietary routing protocol, so it will not work with other vendors.

However, the requirements of the question made no mention of the use of non-Cisco routers, so it will not be an issue in this case.

问题 21 Which PPP subprotocol negotiates authentication options? 正确答案： D. LCP

问题 22 A Cisco router has been configured with the following command: IP nat pool nat-test 192.168.6.10 192.168.6.20 netmask 255.255.255.0 This is an example of what type of NAT?

正确答案： B. Dynamic NAT

反馈： The configuration statement in this example is used to define a pool of IP addresses to be used for dynamic NAT translations.

问题 23 In this network, subnet 10.1.3.0/24 is unknown to router TK2. Which router command will prevent router TK2 from dropping a packet destined for the 10.1.3.0/24 network if a default route is configured?

正确答案： A. ip classless

问题 24 In which situation would the use of a static route be appropriate?

正确答案： B. To configure a route from an ISP router into a corporate network.

问题 25 As a network technician at TestKing.com you would like to implement NAT in the network shown in the exhibit. You would like to allow inside hosts to use a private addressing scheme. Where should NAT be configured? 正确答案： A. TestKing1 router

问题 26 Which one of the following parameters is the very first thing that needs to be configured as part of the IGRP routing process?

正确答案： D. The Autonomous System number

反馈： The term autonomous system refers to a network that is within the control of a single company or organization. The term AS number refers to a number assigned to a single company or organization when it registers its connection to the Internet.

问题 27 Which one of the following commands would you enter to terminate a VTY line session?

正确答案： D. exit

问题 28 When you power up a Cisco router; in what memory is the start-up configuration normally stored in?

正确答案： A. NVRAM

问题 29 TestKing has 25 computers and decides to connect the network to the Internet. TestKing would like for all of the computers to have access to the Internet at the same time, but Test-King only has four usable publicly routable IP addresses. What should be configured on the router so that all computers can connect to the Internet simultaneously?

正确答案： D. Dynamic NAT with overload

问题 30 A network administrator would like to implement NAT in the network shown in the graphic to allow inside hosts to use a private addressing scheme. Where should NAT be configured?

正确答案： A. Corporate router

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