CCNA考试题库中英文翻译版及答案

1、CCNA考试题库中英文翻译版及 案.CCNA考因帰中昊文IB译版及答型1订I. Vhat are two reasons that a network adninistrator would use access lists? (Cboose two.) l出干两Hath.耳Ml管fl!员会梗用访何列養？A. to control vty access into a routerIL to control broadcait traffic through a router工悴“广MHK穿/踣市彩2. 一个JR队的Marp-Interface: 192.168 丄 95 - 0x2Intenu

2、et AddressPhysical AddressType192.168125400.60.0f：2e.l4c6dynamicA. send a unicast ARP packet to the DSL modem/routerA. 发送一个单播ARP包到DSL调制解调器/路由器B. send unicast ICMP packets to the DSL modem/routerB. 发送一个单播ICMP包到DSL调制解调器/路由器C. send Layer 3 broadcast packets to which the DSL modem/router respondsC. 发送三层

3、广播包到响应的DSL调制解调器/路由器D. send a Layer 2 broadcast that is received by Host2, the switch, and the DSL modem/routerD. 发送一个可以被 Host2, the switch, and the DSL modem/router受到的 2 层广播帧Answer: B16. Refer to the exhibit. What is the most efficient summarization that R1 can use to advertise its networks to R2?16

4、. 根据下图，R1能通告给R2的最有效的汇总是?172-1724A. /22 B. /21C. /22D. /24 /24/24 /24E. /25 28/25/24 /24/24Answer: C17. Which spread spectrum technology does the 802.11b standard define for operation?17. 哪种扩频技

5、术是802.11B定义使用的A. IR B. DSSS C. FHSS D. DSSS and FHSSE. IR, FHSS, and DSSSAnswer: B18. Refer to the exhibit. Assume that all router interfaces are operational and correctlyconfigured. In addition, assume that OSPF has been correctly configured on router R2. How will the default route configured on R1

6、 affect the operation of R2?18. 根据下图，假设所有路由器接口都配置正确且正常工作，假设R2上 OSPF置正确，配置在R1 上默认路由会怎么影响R2的工作OSPFArea 0 30.SOI17Z.11(Kk1/30 I SODS0/1 LFaOH 1 202827R1 Routing Commarids? ip route O.OUD10.0.0 swiaMM)、i mrter ospf 1172,16.100.64 26172J6JZ022I1iietwork 17Z16100,0 0.0,OJ at

7、ea 0network 172.10.1M.64 OJ).OJOi3 ai-eii 0iwtwork 172J6.1M. 12S OlO.OJI ar eft 0iiefanii infofnhTiiWi oi igir*(vteA. Any packet destined for a network that is not directly connected to router R1 will be dropped.A. 任何到达一个和路由器R1非直连的网络的数据包都会被丢弃B. Any packet destined for a network that is not directly

8、connected to router R2 will be dropped immediately.B. 任何到达一个和路由器R2非直连的网络的数据包都会被丢弃C. Any packet destined for a network that is not directly connected to router R2 will bedropped immediately because of the lack of a gateway on R1.C. 任何到达一个和路由器R2非直连的网络的数据包都会即时被丢弃，因为R1上缺少网关D. The networks directly conne

9、cted to router R2 will not be able to communicate with the, 28, and 4 subnetworks.D. 直连在R2上的网络将不能够和, 28, 4这些子网通讯E. Any packet destined for a network that is not referenced in the routing table of routerR2 will be directed to R1.

10、 R1 will then send that packet back to R2 and a routing loop will occur.E. 任何目的地没有在R2的路由表中的数据包，R2将会定向到R1,R1会发送哪个数据包到R2,这样路由环路产生 Answer: E19. A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the net

11、work interface port?19. 在一个共享的双绞线的网络上的接口上产生了冲突检测和载波侦听 .通过这个描述 ,关于这个网络接口你知道了什 么A. This is a 10 Mb/s switch port.A. 这是一个 10 Mb/s 的交换端口B. This is a 100 Mb/s switch port.B. 这是一个 100Mb/s 的交换端口C. This is an Ethernet port operating at half duplex.C. 这是一个工作在半双工模式下的以太口D. This is an Ethernet port operating at

12、 full duplex.D. 这是一个工作在全双工模式下的以太口E. This is a port on a network interface card in a PC.E. 这是一个PC机上网卡上的一个接口Answer: C20. Refer to the topology and router configuration shown in the graphic. A host on the LAN isaccessing an FTP server across the Internet. Which of the following addresses could appear a

13、sa source address for the packets forwarded by the router to the destination server?20. 根据下图显示的拓扑结构和路由器配置，一个在该LAN上的主机正在通过INTERNE访问一个FTP服务器。下列地址中哪个可以作为路由器发送到该目的服务器的数据包的源地SIintrfac0200.2.218 2E& 2S5J255_252io, ni oorai outsideinterlace FnttiemetaSI: 200.2 2.18/30tp Bddrcss 2fiE 256.255.010.)

14、 0.0.1/24Quit nsidevpttd直南IIp bat 创 IM 199 999.40 19 9& 962 恥輛掠 26&_2&_2BL224ip ntf ktnid* teur&B M1 pool testIp route 0 0,0.00.0 0.0 200.2 17 |ccesst 1 p 10.1C C Q 0 0 Q 255A. B. C. 3 D. 7E. 7 F. 8Answer: D21. A company is installing IP phone

15、s. The phones and office computers connect to the same device. To ensure maximum throughput for the phone data, the company needs to make sure that the phone traffic is on a different network from that of the office computer data traffic. What is the best network device to which to directly connect

16、the phones and computers, and what technology should be implemented on this device? (Choose two.)21. 一个公司正在安装IP电话。电话和办公室电脑连接到同个设备上，为了保证电话数据的最大传输量，公司需要确 定电话流量是和办公室电脑的数据流量不是在同一个网络上。以下哪个是最好的网络设备，用来直连到电话和电脑，并 且，哪种技术应该被配置在该设备上B. routerA. hubC. switch D. STPE. subinterfaces F. VLANAnswer: CF22. Refer to t

17、he exhibit. Which statement describes DLCI 17?22. 根据下图，那个选项描述了 DLCI 17A. DLCI 17 describes the ISDN circuit between R2 and R3.A. DLCI 17 描述了 R2和R3之间的ISDN线路B. DLCI 17 describes a PVC on R2. It cannot be used on R3 or R1.B. DLCI 17 描述了一条在 R2上的PVC不能用在 R3和R1上C. DLCI 17 is the Layer 2 address used by R2

18、to describe a PVC to R3.C. DLCI 17 是R2使用的二层地址，用来描述一条到R3的PVCD. DLCI 17 describes the dial-up circuit from R2 and R3 to the service providerD. DIDLCI17描述了一条从R2 R3到服务提供商拨号网络Answer: C23. Which routing protocol by default uses bandwidth and delay as metrics?23. 哪个路由协议默认用带宽和延迟作为metrics值A. RIP B. BGP C. OS

19、PF D. EIGRPAnswer: D24. Refer to the output from the show running-config command in the exhibit. What should the administrator do to allow the workstations connected to the FastEthernet 0/0 interface to obtain an IP address?FastEthernet24. 根据下图中展示的show running-config 命令的结果。网络管理员该如何做才能允许工作站连接到 0/0接口去

20、获得一个IP地址R 1 -A show running-configIversion 1hostname ABCiipip name-s-rveF 192,16J. Iip dKp excluded-adless 10 90 20! 1iip dicp pool ABC DHCP10 90.1.0dlault-FOLitftrdns-5ever 192,31.7.152iinrteHace FastEtfwmet 00no ip directed-btoadcastip nat insideIinterface Sehai QfOdesciiption to ISP

21、circuit ID ALDSV3456AX4743MJ0ip address 19231.7.3255,255.255.255 252ip nat outsideip na ir)$icklist 1-hrrfErfec：亡右ena UO Qzerloadipip route M0,00,0.0.0 192,31 7.37accw-s-list 14 permit 10.90.201 jO 0.0.0 255A. Apply access-group 14 to interface FastEthernet 0/0.A. 在接口 FastEthernet 0/0 应用 access-grou

22、p 14B. Add access-list 14 permit any any to the access list configuration.B. 在 access-list 14中添力口 access-list 14 permit any anyC. Configure the IP address of the FastEtherent 0/0 interface to. C. 配置 FastEtherent 0/0 接口的 IP 地址为 D. Add an interface description to the FastEthernet

23、 0/0 interface configuration.D. 为接口 FastEthernet 0/0 添加一个接口描述Answer: C25. Refer to the exhibit. The networks connected to router R2 have been summarized as a/21 route and sent to R1. Which two packet destination addresses will R1 forward to R2? (Choose two.)25.根据下图，网络连接到路由器 R2被汇总为一条192.

24、168.176.0/21的路由，并发给R1。哪两个数据包目的地址 R1会转发给R2OtA. 60B. 1C. D. 55E. F. 5Answer: BE26. Two routers named Atlanta and Brevard are connected by their serial interfaces as shown inthe exhibit, but there is no data connectivity betw

25、een them. The Atlanta router is known to havea correct configuration. Given the partial configurations shown in the exhibit, what is theproblem on the Brevard router that is causing the lack of connectivity?26. 如下图，两个路由器(Atlanta 和Brevard)用串口连接起来。但是他们之间没有数据传输，已知Atlanta配置正确，下图给出部分配置，路由器Brevard上导致该问题的原

26、因是BrevdidAthntaAdantaM show intcrfioes SerialO is up, line pfotocol is upHir(iire is HD64570Intemef address is 192.16040.1/24HTTU 1500 bytesF BW1544 Kbilre I 曲 bilit/2笳血Encapsulation HDLC, toopback notst Kf 即油iv set (10 sec)Bfevrd. ihw inte daces s1S&fiaM is 呗 line ptMocol ts upHrdwi)reb HD64570Inte

27、rnet address 192,169,112 24MTU 1500 bytes. 0W 56000 Kbit relubility 25 知静fcncjpsulahoii ADLCr loopback net setKeepive 5e1 (10ec)A. A loopback is not set. A.没有设置 loopback 命令B. The IP address is incorrect. B.IP地址不正确C. The subnet mask is incorrect. C.子网掩码不正确串行链路封装不正确 D. D. The serial line encapsulations are incompatible.E. The maximum transmission unit (MTU) size