ccna题库选择题没答案ccna640-802v104

1、CCNA（640-802）题库V104.4Number: 640-802Passing Score: 825 Time Limit: 120 minFile Ver: 104.4CCNA（640-802）题库V104.4（2012.11.11）CCNA 题库战报500人超级群CCNA题库/战报 发布区：正版题库、看战报，请随时关注CCNA报名报名思科CCNA=更新内容：V104.4增加全文中文注释，汇总V104.3九次更新，删除部分旧题目，为目前 2011.8.1 更新：增加新题，修订部分错误。正版题库；2012.2.14更新：节版2012.4.9更新：增加6道选择题 524-529，增加1道

2、拖图题 561，修改322、435、439、505题题2012.10.24更新：增加12道选择题 530-541，更新部分注释2012.11.11更新：增加9道选择题 542-550，更改130题=，修改472Exam AQUESTION 1When you are loggedo a switch, which prompt indicatest you are in privileged mode?A.B.C.D.E.%$ #.QUESTION 2Whichd shows system hardware and software verinformation?A.B.C.D.E.show

3、show show show showconfiguration environment inventory platformverQUESTION 3Cisco Catalyst switches CAT1 and CAT2 have a connection betn them using ports FA0/13. An 802. 1Qtrunk is configured betn the two switches. On CAT1, VLAN 10 is chosen as native, but on CAT2 thenative VLAN is not specified.Wha

4、t will happenhis scenario?802.1Q giants frames could saturate the link.VLAN 10 on CAT1 and VLAN 1 on CAT2 will send untagged frames.A native VLAN mismatch error message will appear.VLAN 10 on CAT1 and VLAN 1 on CAT2 will send tagged frames.QUESTION 4Whichd would correctly configure a serial port on

5、a router with the last usable host addresshe2/29 subnet?A.B.Router(config-if)# ip address 8 40Router(config-if)# ip address 9 24C.D.E.F.Router(config-if)# Router(config-if)# Router(config-if)# Router(config-if)#ip ip ip ipaddress address address address393848484848QUESTION 5The network default gatew

6、ay applying to a host by DHCP is 3/28. Which option is the valid IPaddress of this host?A.B.C.D.E.57024QUESTION 6Which two addresses can be assigned to a host wisubnet mask of ? (Choose two.)A.B.C.D.E.5555QUESTION 7The network administrator has asked you to check the s us of the works ions IP stack

7、bying theloack address. Which address would youto perform this task?A.B.C.D.。QUESTION 8Works ion A has been assigned an IP address of 4/28. Works ion B has been assigned an IPaddress of 00/28. The two works ions are connected wistraight-through cable. Attempts tobetn the hosts are unsucsful. What tw

8、o things can be done to allow communications betnthe hosts? (Choose two.)A. Replace the straight-through cable wicrossover cable.Change the subnet mask of the hosts to /25.Change the subnet mask of the hosts to /26.Change the address of Works ion A to 5.Change the address of Works ion B to 11.Answer

9、:Explanation/Reference:A工作站被指派的IP地址是4/28，B工作站被指派的IP地址是00/28，两个工作站之间用一直通线缆连接，尝试让两主机互显示失败， 以下哪两种操作可以使两个主机通信成功呢？考点分析：两台主机是相同设备，所以要用交叉线相连。然后判断两台主机是否在同一子网下，网络位都是28位： 24 = 0001 1000 100= 0110 0100很明显主机A、B不在同一个网段，要想在同一网段，前面相同的比特位为网络位。24=0 0011000 100=0 1100100所以网段是/25。QUESTION 9Your ISP has given you the a

10、ddress /29 to assign to your routerserface. They have alsogiven you the default gateway address of . After you have configured the address, the router isunable toany remote devi. What is preventing the router froming remote devi?A. The default gateway is not an address on thibnet.B. The default gate

11、way is the broadcast address for thibnet.C. The IP address is the broadcast address for thibnet.D. The IP address is an invalid class D multicast address.Answer:Explanation/Reference:ISP为你的路由器接口分配地址/29，并告诉你 的网关地址为，配置后发现路由器无法通远端设备，哪是什么原因路 由器通远端设备？考点分析：这道题考的是VLSM。题中的地址有29位网络位，所以主机位为32-29=3，网段地址有23=8。即

12、网段地址为-，为最后一个地址，即广播地址，所以不能作为网关地址，因此。QUESTION 10Whichd is used to copy the configuration from RAMo NVRAM?A.B.C.D.E.copy copy copy copyrunning-config startup-config startup-config: running-config: running config startup config startup config running configwrite terminalExplanation/Reference:哪条命令用来将RAM中

13、的配置文件到NVRAM？考点分析：这道题考的是基本令。要将本地的配置文件保存在NVRAM中，使用start。令就是copy runQUESTION 11WhichRAM?d is used to load a configuration from a TFTP server and merge the configurationocopy copy copy copyrunning-config: TFTP: TFTP: running-config TFTP: startup-config startup-config: TFTP:A.B.C.D.Answer:Explanation/Ref

14、erence:哪一个命令是用来从TFTP服务器上装入配置文件到RAM中？考点分析：这道题考的是基本令。要将TFTP中备份的配置文件恢复到RAM中，使用令就是copyTFTP run。QUESTION 12A system administrator types thet change stored?d to change the hostname of a router. Where on the Cisco IFS isA. NVRAM B. RAM C. FLASH D. ROM E. PCMAnswer:Explanation/Reference:一个系统管理员敲入命令去修改路由器的主机

15、名，下面那个地方保存的文件会发生变化？考点分析：模式下，输入的任何命令都是即时生效的，都只会保存在RAM中。如果不进行其他的保存，当Cisco设备断电后，RAM不会 running-config保存在RAM中 startup-config保存在NVRAM中任何数据，会自动清零。QUESTION 13Whichd is used to configure a default route?A.B.C.D.ip ip ip iproute route route route Answer: Explanation/Reference:下面那条命令用来配置默认路由？考点分析：这道题考的是默认路由。很明

16、显是 。QUESTION 14If IP routing is enabled, which two(Choose two.)ds set the gateway of last resort to the default gateway?A.B.C.D.E.ip ip ip ip ipdefault-gateway route default-network default-route route Answer:Explanation/Reference:如果已经配置IP路由，哪两条命令可以设置默认网关?考点分析：这道题考的是路由器默认网关的设置。对于路由器来说，默认路由中指明的下一跳即为路

17、由器的网关QUESTION 15Whichd would you configure globally on a Cisco routert would allow you to view directlyconnected Cisco devi?enable cdpA.B.C.D.cdp cdp runenable run cdpAnswer:Explanation/Reference:那一条命令在全局配置模式下能查看直连的cisco设备？考点分析：这道题考的是CDP协议。CDP协议在路由器全局启用令是cdp run，是。QUESTION 16Whichd is used to see th

18、e path taken by packets across an IP network?show showip route routeA.B.C.D.traceroute trace ip routeAnswer: Explanation/Reference:哪条命令用于查看数据包转发所经过的路径？A:查看路由表 B：没有这条命令 C：正确 D：没这条命令QUESTION 17Whichd is used to debug ad?A.B.C.D.debug debug debug debugicmp ip icmp tcp packetAnswer: Explanation/Referenc

19、e:哪一条命令用来查看一个debug令？考点分析：这道题考的是基本命令。因为命令使用的是ICMP协议，所以用来debug命令是debug ipicmp，所以是 。QUESTION 18Whichd displays CPU utilization?A.B.C.D.show show show showprotocolsprossystem verAnswer:Explanation/Reference:哪一条命令显示CPU利用率？考点分析：这道题考的是基本命令。查看CPU的利用率要使用show pros命令QUESTION 19When configuring a serialerface o

20、n a router, what is the default encapsulation?A. atm-dxi B. frame-relay C. hdlc D. lapb E. pppAnswer: Explanation/Reference:当配置串口时，哪一个是默认封装？默认封装是QUESTION 20What must be set correctly when configuring a serialbest route?erfaot higher-level protocols calculate theA. bandwidth B. delay C. load D. relia

21、bilityAnswer:Explanation/Reference:配置串口时什么参数需要正确设置以便高级路由协议计算最优路由？考点分析：这道题考的是最优路由的度量标准。高级路由协议在计算最优路由时的度量标准是串口的带宽，所以一定要正确的配置串口的带宽，是 。QUESTION 21A company implementsnetwork slows down, and the this?conferenciner IP on their Ethernet LAN. The users noticet theeither stutters or fails comple y. What is t

22、he most likely reason forminimum cell rate (MCR)quality of service (QoS)modulationpacket switching exchange (PSE)reliable transport protocol (RTP)Answer: Explanation/Reference:一公司使用基于以太网的原因是什么？会议。用户发现网络变慢，断断续续，或者是完全传布过来，最有可能的考点分析：在一个网络中如果要保证和语音流量的服务质量，需要通过Qos协议来完成QUESTION 22Which layerhe OSI referen

23、ce mis responsible for determining the availability of the receivingprogram and checking to see if enough resourexist fort communication?A. transport B. network C. presen ion D. ses E. applicationAnswer:Explanation/Reference:OSI中那一层负责决定一个进程的可用性并查看是否有可用的资源分给该进程？考点分析：OSI七层参考模型中负责决定一个进程的可用性并查看是否有可用的资源分

24、给该进程是第七层应用层QUESTION 23Daransfer is slow betn the source and destination. The quality of service requested by the transportlayerhe OSI reference mis not being ma ained. To fix this ie, at which layer should thetroubleshooting pros begin?A. presen ion B. ses C. transport D. network E. physicalAnswer:E

25、xplanation/Reference:数据传输在源和目的之间变慢，QOS没有被配置在OSI中的传输层上，为了解决这个问题，应从那一层入手？考点分析：数据传输在源和目的之间变慢，要解决这个问题，要从第三层网络层开始，是 。QUESTION 24Which protocols are foundhe network layer of the OSI reference mand are responsible for pathdetermination and traffic switching?LANrouting C. WAND. networkAnswer: Explanation/Re

26、ference:在osi模型网络层中哪一个协议是用来做路径选择和的？考点分析：这道题考的是路由协议的作用，负责路径选择和流量交换的肯定是路由协议QUESTION 25Whichd reveals the last method used toercycle a router?show show show showreload bootrunning-config verA.B.C.D.Answer:Explanation/Reference:哪一个命令可以显示最近一次被用来重启路由器的方法？考点分析：可以显示最近一次重启路由器信息令是show verQUESTION 26Which three

27、 options are valid WAN connectivity methods? (Choose three.)A.B.C.D.E.F.PPP WAP HDLC MPLS L2TPv3 ATMAnswer:Explanation/Reference:哪三种封装属于WAN链路的?考点分析：这道题考的是WAN链路的封装方法，WAN链路的封装方法有PPP、HDLC和ATM三种QUESTION 27Refer to the exhibit. Which WAN protocol is being used?A.B.C.D.ATM HDLCFrame Relay PPPAnswer:Explan

28、ation/Reference:如下图，使用的是哪个广域网协议？考点分析：如图，可以看见LMI这个参数，LMI是帧中继中的概念，所以为 。QUESTION 28What is the difference betn a CSU/DSU and a modem?A. A CSU/DSU convertsog signals from a router to a leased line; a modem convertsog signalsfrom a router to a leased line.B. A CSU/DSU convertsog signals from a router to

29、a phone line; a modem converts digital signalsfrom a router to a leased line.C. A CSU/DSU converts digital signals from a router to a phone line; a modem converts from a router to a phone line.og signalsD. A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital si

30、gnals from a router to a phone line.Answer:Explanation/Reference:csu/dsu和modem的不同点是什么？考点分析：这道题考的是CSU/DSU和modem的基本作用。CSU/DSU是把数字信号从路由转换到租用线路上，modem是进行数模转换的设备。CSU/DSU一般是专线，MODEN是将模拟信号与数字信号转换QUESTION 29A network administrator must configure 200 switch ports to accept traffic from only the currently att

31、achedhost devi. What would be the most efficient way to configure MAC-level security on all these ports?A. Visually verify the MAC addresses and thennet to the switches to enter the switchport-port securitymac-addressB. Have end users mac-addressd.their MAC addresses. to the switch to enter the swit

32、chport-port securityC. Use the switchport port-security MAC address stickyd on all the switch portsve enddeviconnected to them.D. Use show mac-address-table to determine the addressest are assoted with each port and thenenter theds on each switch for MAC address port-security.Answer:Explanation/Refe

33、rence:A网络管理员必须配置200个交换端口来容纳来自目前附加的主机设备的流量。要为所有的端口设定MAC级安全，哪一种是最高效的方法？考点分析：这道题考的是端口安全。黏性可靠的MAC地址能让交换机自动学习来绑定，这个设置会被保存在MAC地址中和运行设置文件中，保存设置后，交换机重起后不用再自动重新学习MAC地址 A：先验证mac安全性，然后在交换机上绑定。错误，工作量太大 B：用户发送邮件认证再在交换机上配置，错误，不科学。C：使用port-security，正确。 D：错误，工作量太大。QUESTION 30When troubleshooting a Frame Relay conne

34、ction, what is thestep when performing a loack test?A. Set the encapsulation of theerface to HDLC.B. Place the CSU/DSU in local-loop mode.C. Enable local-loop mode on the DCE Frame Relay router.D. Verifyt the encapsulation is set to Frame Relay.Answer:鸿鹄：ht/鸿鹄书院：htt/Explanation/Reference:当排错一个帧中继连接问

35、题，进行环回口测试时，第一步应该做什么?考点分析：loack 测试，就是测试本地接口。这个题，可以理解为， FR环境中，如果想本地LMI 要怎么办。当然是先把封装改成HDLC了，因为，封装成FR，本地是不通的。看题目最后 performing a lo环回测试 意思是本地的ack test?hdlc 是只定义本地意义的！ 就是DTE到贞中继交换机之间。QUESTION 31What occurs on a Frame Relay network when the CIR is exceeded?A.B.C.D.All TCP traffic is marked discard eligible

36、.All UDP traffic is marked discard eligible and a All TCP traffic is marked discard eligible and ais sent. is sent.All traffic exceeding the CIR is marked discard eligible.Answer:Explanation/Reference:当在一个帧中继网络中，CIR过载会发生什么？考点分析：这道题考的是帧中继。CIR是在帧中继技术中，是用户向帧中继业务运营商申请的是承诺的信息速率。当信息速率突发量大于Bc+Be时，网络将丢弃帧。是

37、。D：所有超过的流量都丢弃。QUESTION 32What are two characteristics of Frame Relay po -to-posub erfa? (Choose two.)A.B.C.D.E.They create split-horizon ies.They require a unique subnet within a routing.They emulaeased lines.They are ideal for full-mesh topologies.They require the use of NBMA options when using OSP

38、F.Answer:Explanation/Reference:帧中继点到点子接口的特点？A：水平分割，错误。 B：每个子接口需要一个独立的网段，正确。 C：类似专线，正确。D:全网互联是理想拓扑，错误。通常是hub-spoke E：NBMA不支持OSPF，错误。考点分析：这道题考的是帧中继。帧中继网络中点到点子接口的两个特性是需要一个唯一的子网和模拟了租用线路，是。QUESTION 33Refer to the exhibit. Addresses withhe range /24 are not being translated to the 1.128.0/16range. Whichd

39、shows if /24 are allowed inside addresses?CCNA题库战报 群A.B.C.D.debug ip natshow show showac ip ips-listnat translationnat sisticsAnswer:Explanation/Reference:如图，/24没有转换成/16。那一个命令用来查看 是否被允许在中？A：打开NAT转换的debug信息，错误 B：查看acl信息，正确。 C：查看NAT转换表，错误。 D：查看静态NAT。错误地址池考点分析：图中显示的是NAT，要求查看 是否被允许在地址池中，即要查看控制类表，所以是 。QU

40、ESTION 34A wireless c nt cannot connect to an 802.11b/g BSS wib/g wireless card. The c nt section of theacs podoes not list any active WLAN c nts. What is asible reason for this?A. The incorrect channel is configured on the c nt.B. The cC. The c D. Thents IP address is on the wrong subnet. ns an inc

41、orrect pre-shared key.is configured incorrectly on the c nt.Answer:Explanation/Reference:一个无线客户端用无线网卡不能连接一个802.11B/G网络，客户端的连接部分不能显示任何活动的无线客户端， 最有可能的原因是什么？ A：不正确的信道。错误 B：客户端的IP地址配置错误 C：客户端的共享key错误。D：配置不正确。考点分析：这道题考的是无线。题中所说AP无法列出任何活动的无线客户端，而无线客户端用无线网卡也不能连接一个802.11B/G网络，而引起的原因最有可能的是配置错误，是D。QUESTION 35

42、Which two features didv1 add to address the inherent weaknesses found in? (Choose two.)A. a stronger encryption algorithm B. key mixing using temporal keysC. shared key authenticationD. a shorter initialization vector E. per frame sequence countersAnswer: Explanation/Reference:1有哪两个特点是根据A：更强的加密算法 B：

43、混合使用的密钥 C：共享密钥认证 D：较短的初始化向量 E：一个帧一个序列计数器。的缺陷加上去的？1根据的缺陷加上去的两个特性是密钥混合性以及使用临时密钥提高安全性和采用每帧考点分析： 序列计数器，是。QUESTION 36Which two wireless encryption methods are based on the RC4 encryption algorithm? (Choose two.)A. B. CCKM C. AES D. TKIP E. CCMPAnswer: Explanation/Reference:哪两个无线的A:有线等效是基于RC4的加密算法？协议B：英特尔

44、开发一种协议 C：高级加密标准 D：暂时密钥集成协议 E:基于AES的考点分析：使用RC4加密算法的无线和TKIP，是AD。是QUESTION 37What are two characteristics of RIPv2? (Choose two.)A. classful routing protocol B. variable-length subnet masks C. broadcast addressing D. manual route summarizationE. uses SPF algorithm to compute pathAnswer: Explanation/Ref

45、erence: RIPV2的两个特点是什么？A：有类路由协议，错误 B：可变长度子网掩码，正确 C：采用广播地址更新，错误 D：手动路由汇总，正确E:使用spf算法计算路径，错误。QUESTION 38Which two Ethernet fiber-optic modepport distanof greatern 550 meters?A. 1000BASE-CX B. 100BASE-FX C. 1000BASE-LX D. 1000BASE-SX E. 1000BASE-ZXAnswer: Explanation/Reference:哪两个以太网光纤模块支持超过550米的距离？A：最长

46、距离25米 B：最长距离100米 C：最长距离3000米 D：最长距离550米 E：最长距离70千米QUESTION 39What two things will a router do when running a distance vector routing protocol? (Choose two.)A.B.C.D.E.Send periodic updates regardless of topology changes.Send entire routing table to all routershe routing.Use the shortest-pa Update the

47、 routing tablgorithm to the determine best path. ased on updates from their neighbors.Ma ahe topology of the entire network in its database.Answer: Explanation/Reference:一个路由器运行距离矢量路由的时候有哪两个特点？A：周期性更新，正确 B：发送整个路由表到整个路由域，错误，只发送给邻居 C：使用SPF算法，错误 D：依靠邻居发送更新来更新路由表，正确E：在数据库中整个网络的拓扑。错误QUESTION 40Refer to t

48、he exhibit. According to the routing table, where will the router send a packet destined for5?A.B.C.D.Answer:Explanation/Reference:通过下边的路由表， 路由器如果有到达5的包，他应该走哪一个路由？考点分析：路由器在路由表项中寻找下一跳时，做遵循最长匹配原则，即选择能匹配的最长子网掩码，是。QUESTION 41Whichd shows if an acs list is assigned to anerface?A.B.C.D.show ip show ip ac

49、show ip show ip acerface erface acs-lists erfaces-listserface erface erfaces-lists erfaceAnswer:Explanation/Reference:下面哪一个命令可以显示一个接口上是否被配置列表？考点分析：这道题考的是基本命令。show ip一遍试试。erface可以显示接口的控制列表，大家可以在模拟器上敲QUESTION 42Refer to the exhibit. Which rule does the DHCP server use when there is an IP address?A.B.C

50、.D.E.The address is removed from the pootil theis resolved. is resolved.The address remainshe pootil theOnly the IP detected by Gratuitous ARP is removed from the pool.Only the IP detected byis removed from the pool.The IP will be shown, even after theis resolved.Answer: Explanation/Reference:当出现IP的

51、地址show ip dhcp的时候，DHCP服务器将会采取什么样的措施？命令可以查看哪些ip地址在使用上有。有的地址不再分配出去。A：地址被删除直到 B:地址保留直到解决，正确解决，错误C/D： E：当片面。解决后，地址会被显示。错误。考点分析：DHCP在发现IP地址案是A。时，会把它从地址池中移除，直到结束，再把它放回地址池中。答QUESTION 43Refer to the exhibit. You are connected to the router as user Mike. Whichd allows you to seeoutput from the OSPF debugd?te

52、rminal monitorA.B.C.D.show show showdebugging sessipferfaceAnswer:Explanation/Reference:如图，通过mike这个用户连接到路由器，哪一个命令允许你能查看OSPF debug 输出？A：让debug信息在终端上显示出来 B：没这条命令 C：查看会话信息。D:查看启用了ospf的接口的相关信息。考点分析：这道题考的是 net用户查看debug信息。默认情况下， net用户是无法看见本地机器的debug信息，如果需要查看，要输入terminal monitor命令。是A。QUESTION 44Refer to th

53、e exhibit. If number 2 ifrom a privileged prompt?ected from the setup script, whappens when the user runs setupA.B.C.D.Setup is additive and any changes will be added to the config script.Setup effectively starts the configuration over as if the router was booted for the Setup will not run if an ena

54、ble secret password exists on the router.time.Setup will not run, because it is only viable when no configuration exists on the router.Answer:Explanation/Reference:当用户在模式下 输入setup的时候，如果选择2 会发生什么？0不保存进入IOS命令配置模式 1不保存返回设置模式2保存退出 A：设置和改动被保存到配置B：为有效地重新开始配置，如果路由器是第一次启动的配置。C：如果配置了，设置不会运行D：设置不可用，因为它只能在没有配置

55、存在时才有效。考点分析：这道题考的就是图中【2】这句话的意思。将配置文件保存到NVRAM，然后退出。显然是QUESTION 45Refer to the exhibit. Which (config-router)be advertised by RIP?d will allow the network represented on theerface toA.B.C.redistribute ethernet0 network ethernet0 redistribute D.network Answer:Explanation/Reference:在路由配置模式下，那一个命令允许网络通过R

56、IP把这个接口发布出去？考点分析：这道题考的是在如何在rip下通告一个网段，明显是network命令QUESTION 46Refer to the exhibit. What information can be gathered from the output?A.B.C.D.One router is running RIPv1.RIP neigh.The network contains a loop. Network is reachable.Answer: Explanation/Reference:通过以下输出信息能得到什么结果？由图中可以看出本地已经存在这条路由。QUESTION

57、 47Refer to the exhibit. What type of connection would be supported by the cable diagram shown?A.B.C.D.PC to router PC to switch server to router router to routerAnswer:Explanation/Reference:考点分析：这道题考的是线序。如图，线两头的线序一样，代表这是直连线，而直连线是连接不同设备的，是 。QUESTION 48Refer to the exhibit. What type of connection wo

58、uld be supported by the cable diagram shown?A.B.C.D.PC to router PC to switch server to switch switch to routerAnswer:Explanation/Reference:考点分析：这道题考的是线序。如图，线两头的线序不一样，代表这是交叉线，而交叉线是连接相同设备的，是 。QUESTION 49Which two s ements describe the Cisco implemen ion of VLANs? (Choose two.)A.B.C.D.E.VLAN 1 is the

59、default Ethernet VLAN.CDP advertisements are only sent on VLAN 1002. By default, the management VLAN is VLAN 1005. By default, the switch IP address is in VLAN 1005.VLAN 1002 through 1005 are automatically created and cannot be deleted.Answer: Explanation/Reference:考点：考查vlan知识点。A：缺省都存在vlan1，端口都属于vla

60、n1，正确 B：CDP信息只发送到vlan1002，错误，vlan1002是i网络的vlan号。C：缺省情况交换机IP配置在vlan1005，错误，vlan1005trnet网络的vlan号。缺省在vlan1里面。D：vlan1002-1005自动生成并不能被删除，正确，他们都是被保留的特殊vlan。QUESTION 50Refer to the exhibit. What can be determined about the router from the console output?CCNA题库战报 群A.B.C.D.No configuration file was found in