CISCOCCNA网络工程师题库

1、培训大讲堂官方YY 频道：3660mCCNA考试代号： 640-802110+30=140通过分数： 825鸿鹄论坛招募CCNA、CCNP答疑地点：鸿鹄官方YY3660V104V105 V106 V108=更新内容：5519、520、521、522、5231763754434825988453107270增加个别疑难拖图题注释，优化试验题= QUESTION 1Whenyouareloggedintoaswitch,whichpromptindicatesthatyouareinprivilegedmode(当您登录到交换机，哪种提示表明你在特权模式？)%$# Answer: ESection

2、: Chapter 4: Introduction to Cisco IOSExplanation/Reference:特权模式就是#提示符QUESTION 2Which command shows system hardware and software version information(哪些命令显示系统硬件和软件的版本信息？)show configurationshow environmentshow inventoryshow platformshow versionAnswer: ESection: Chapter 4: Introduction to Cisco IOSExpl

3、anation/Reference:查看系统的软件和硬件信息使用的命令是show versionQUESTION 3Cisco Catalyst switches CAT1 and CAT2 have a connection between them using portsFA0/13. An 802. 1Q trunk is configured between the two switches. On CAT1, VLAN10 is chosen as native, but on CAT2 the(思科 Catalyst 交换机 CAT1 和 CAT2 有它们之间的连接使用端口FA0/

4、13CAT1做为VLAN10CAT2 VLAN 未指定。在这种状况下会发生什么？)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.Answer: CSection: Chapter 10: VLANExplanation/Reference:假如两边native.switch 将报nativeQUESTION

5、 4Which command would correctly configure a serial port on a router with the lastusable host address in the（/29 子网的路由器上配置的串行端口？）Answer: FSection: Chapter 4: Introduction to Cisco IOSExplanation/Reference:QUESTION 5valid IP address of this host()Answer: CSection: Chapter 3: IP Addressing and VLSMExpl

6、anation/Reference:考点：考查VLSMA：超出范围 B：广播地址 C：正确 D：网络号 E：超出范围QUESTION 6Which two addresses can be assignedAnswer: BDSection: Chapter 3: IP Addressing and VLSMExplanation/Reference:考点：考查VLSMA：网络号 B/D：正确 C：广播地址 E：网络号QUESTION 7The network administrator has asked you to check the status of the workstations

7、 IP stack by pinging the loopback address. Which address would you ping to performthis task网络管理员已要求您通过 ping 环回地址检查工作站的 IP 堆栈的状态。您要执行此任务将 ping 哪个地址？Answer: BSection: Chapter 3: IP Addressing and VLSMExplanation/Reference:考点：使用ping 来检测主机的IPQUESTION 8ping between the hosts are unsuccessful. What two th

8、ings can be done to allowcommunications between the hosts (Choose two.)Replace the straight-through cable with a crossover cable.Change the subnet mask of the hosts to /25.Change the subnet mask of the hosts to /26.Answer: ABSection: Chapter 3: IP Addressing and VLSMExplanation/Reference:考点：同构设备使用交叉

9、线，两端的IP 需要在同一个子网。A：使用交叉线替换现有的直通线。正确。B：25C：26D/E：错误，都不能使他们在同一个子网。QUESTION 9unable to ping any remote devices. What is preventing the router from pingingremote devices()The default gateway is not an address on this subnet.The default gateway is the broadcast address for this subnet.The IP address is t

10、he broadcast address for this subnet.The IP address is an invalid class D multicast address.Answer: BSection: Chapter 3: IP Addressing and VLSMExplanation/Reference:考点：考查VLSM。 A：默认网关不属于这个子网，错误 B：默认网关是这个子网的广播地址，正确C：这个地址是子网的广播地址，错误 D：这个地址是组播地址，错误。 QUESTION 10Which command is used to copy the configura

11、tion from RAM into NVRAM哪个命令用于从RAM 复制到NVRAMcopy running-config startup-configcopy startup-config: running-config:copy running config startup configcopy startup config running configwrite terminalAnswer: ASection: Chapter 4: Introduction to Cisco IOSExplanation/Reference:QUESTION 11Which command is u

12、sed to load a configuration from a TFTP server and merge the configuration into RAM(哪些命令用于从 TFTP 服务器加载配置或合并到RAM 的配置？)copy running-config: TFTP:copy TFTP: running-configcopy TFTP: startup-configcopy startup-config: TFTP:Answer: BSection: Chapter 4: Introduction to Cisco IOSExplanation/Reference:QUEST

13、ION 12A system administrator types the commandto change the hostname of a router. Whereon the Cisco IFS is that change storedNVRAMRAMFLASHROMPCMCIAAnswer: BSection: Chapter 4: Introduction to Cisco IOSExplanation/Reference:running-configRAMstartup-config 保存在NVRAMQUESTION 13Which command is used to c

14、onfigure a default routeAnswer: DSection: Chapter 6: IP RoutingExplanation/Reference:QUESTION 14If IP routing is enabled, which two commands set the gateway of last resort to thedefaultgateway（假如启用了 IP 路由，哪两个命令设置网关的最终到默认网关？）(Choose two.)Answer: CESection: Chapter 6: IP RoutingExplanation/Reference:产

15、生默认网关的两种方式ip default-networkip route QUESTION 15Which command would you configure globally on a Cisco router that would allow youto view directly connected Cisco devices(该命令将全局上配置使您可以直接查看的 Cisco 路由器连接 Cisco 设备吗？)enable cdpcdp enablecdp runrun cdpAnswer: CSection: Chapter 5: Managing Cisco IOSExplana

16、tion/Reference:QUESTION 16Which command is used to see the path taken by packets across an IP network(哪些命令用于看到通过 IP 网络数据包所实行的路径？)show ip routeshow routetraceroutetrace ip routeAnswer: CSection: Chapter 2: TCP/IPExplanation/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 17Which comm

17、and is used to debug a ping commandping 命令？debug icmpdebug ip icmpdebug tcpdebug packetAnswer: BSection: Chapter 5: Managing Cisco IOSExplanation/Reference:ping 调用了icmp 协议，而icmp 数据包封装在ipQUESTION 18Which command displays CPU utilizationCPU 利用率呢？show protocolsshow processshow systemshow versionAnswer:

18、 BSection: Chapter 5: Managing Cisco IOSExplanation/Reference:CPUQUESTION 19Whenconfiguringaserialinterfaceonarouter,whatisthedefaultencapsulation在配置一个串行接口的路由器，什么是默认的封？atm-dxiframe-relayhdlclapbppp Answer: CSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:缺省封装是HDLCQUESTION 20Whatmus

19、tbesetcorrectlywhenconfiguringaserialinterfacesothathigher-levelprotocols calculate the best route什么时，必需设置正确配置串行接口，以便更高级别的协议计算最佳路线？bandwidthdelayloadreliabilityAnswer: ASection: Chapter 6: IP RoutingExplanation/Reference:是可以配置的。QUESTION 21A company implements video conferencing over IP on their Ethe

20、rnet LAN. The users noticethatthenetworkslowsdown,andthevideoeitherstuttersorfailscompletely.What is the most likely reason for this公司对他们的以太网 LAN ip 实现视频会议。用户留意网络变慢，和视频断断续续或完全失败。最有可能的缘由是什么？minimum cell rate (MCR)quality of service (QoS)modulationpacket switching exchange (PSE)reliable transport prot

21、ocol (RTP)Answer: BSection: Chapter 9: SwitchingExplanation/Reference:考点：当网络中使用视频会议后发觉网络格外慢，什么缘由引起的？ QoS：用于定制策略对不同流量进行把握。QUESTION 22Which layer in the OSI reference model is responsible for determining the availabilityofthereceivingprogramandcheckingtoseeifenoughresourcesexistfor that communicationO

22、SI 参考模型在哪一层负责确定接收程序的可用性和检查足够的资源，是否存在该通信？transportnetworkpresentationsessionapplicationAnswer: ESection: Chapter 1: IntroductionExplanation/Reference:哪一层确定的接收程序的可用性？应用层供应QUESTION 23Data transfer is slow between the source and destination. The quality of servicerequestedbythetransportlayerintheOSIrefe

23、rencemodelisnotbeingmaintained. To fix this issue, at which layer should the troubleshooting process beginOSI 参考模型的传输层所要求的服务质量。要解决此问题，在哪一层应故障排解过程开头？presentationsessiontransportnetworkphysicalAnswer: DSection: Chapter 1: IntroductionExplanation/Reference:解决网络问题，先确保网络层通信。QUESTION 24Which protocols are

24、 found in the network layer of the OSI reference model and areresponsible for path determination and traffic switching哪些协议在网络层 OSI 参考模型中找到，负责路径测定和交通切换？LANroutingWANnetworkAnswer: BSection: Chapter 1: IntroductionExplanation/Reference:OSI由路由协议供应。通过手工或者动态学习路由条目实现。QUESTION 25Which command reveals the l

25、ast method used to powercycle a routershow reloadshow bootshow running-configshow versionAnswer: DSection: Chapter 5: Managing Cisco IOSExplanation/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？ QUESTION 26Which three options are valid WAN connectivity methods (Choose three.)PPPWAPHDLCMPLSL2TPv3ATM Answer: ACF

26、Section: Chapter 14: Wide Area Network (WAN)Explanation/Reference:哪三种封装属于WANA:点到点协议，正确 B：无线加密技术，错误C:思科缺省封装格式，正确。D：多协议标签转换，错误 E：隧道协议，错误 F：正确。QUESTION 27Refer to the exhibit. Which WAN protocol is being usedATMHDLCFrame RelayPPP Answer: CSection: Chapter 14: Wide Area Network (WAN)Explanation/Referenc

27、e:由图中的红线可看到发送接受LMI 信息。属于FR 的数据包。QUESTION 28What is the difference between a CSU/DSU and a modem【一个CSU/DSU 和调制解调器之间的区分是什么？】ACSU/DSUconvertsanalogsignalsfromaroutertoaleasedline;amodemconvertsanalog signals from a router to a leased line.ACSU/DSUconvertsanalogsignalsfromaroutertoaphoneline;amodemconve

28、rtsdigital signals from a router to a leased line.ACSU/DSUconvertsdigitalsignalsfromaroutertoaphoneline;amodemconvertsanalog signals from a router to a phone line.ACSU/DSUconvertsdigitalsignalsfromaroutertoaleasedline;amodemconvertsdigital signals from a router to a phone line.Answer: DSection: Chap

29、ter 14: Wide Area Network (WAN)Explanation/Reference:CSU/DSUMODENQUESTION 29A network administrator must configure 200 switch ports to accept traffic from only the currently attached host devices. What would be the most efficient way to configure MAC-level security on all these portsVisually verify

30、the MAC addresses and then telnet to the switches to enter theswitchport-port security mac-address command.Have end users e-mail their MAC addresses. Telnet to the switch to enter theswitchport-port security mac-address command.Use the switchport port-security MAC address sticky command on all the s

31、witchports that have end devices connected to them.有端设备连接到他们的全部交换机端口上使用交换机端口端口平安 MAC 地址粘滞命令。Use show mac-address-table to determine the addresses that are associated witheachportandthenenterthecommandsoneachswitchforMACaddressport-security. Answer: CSection: Chapter 9: SwitchingExplanation/Reference

32、:200A：先验证macB：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 30WhentroubleshootingaFrameRelayconnection,whatisthefirststepwhenperforminga loopback test【帧中继连接故障排解时，执行环回测试时的第一步是什么？】Set the encapsulation of the interface to HDLC.Place the CSU/DSU in local-loop mode.Enable local-loop

33、mode on the DCE Frame Relay router.Verify that the encapsulation is set to Frame Relay.Answer: ASection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:在对 FRA：讲接口配置成HDLC，正确，FR 封装下无法正常pingQUESTION 31What occurs on a Frame Relay network when the CIR is exceededAll TCP traffic is marked disca

34、rd eligible.All UDP traffic is marked discard eligible and a BECN is sent.All TCP traffic is marked discard eligible and a BECN is sent.All traffic exceeding the CIR is marked discard eligible.Answer: DSection: Chapter 14: Wide Area Network (WAN)Explanation/Reference:FR 网络中，当CIRD：全部超过的流量都丢弃。QUESTION

35、 32What are two characteristics of Frame Relay point-to-point subinterfaces (Choosetwo.)They create split-horizon issues.They require a unique subnet within a routing domain.They emulate leased lines.They are ideal for full-mesh topologies.They require the use of NBMA options when using OSPF.Answer:

36、 BCSection: Chapter 14: Wide Area Network (WAN)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:全网互联是抱负拓扑，错误。通常是hub-spokeE：NBMAOSPF，错误。QUESTION 33debug ip natshow access-listshow ip nat translationshow ip nat statisticsAnswer: BSection: Chapter 8: NATExplanation/Referen

37、ce:。允许的范围是通过ACL 定义的。A：打开NAT 转换的debugB：查看aclC：查看NATD：查看静态NAT。错误QUESTION 34access point does not list any active WLAN clients. What is a possible reasonfor thisThe incorrect channel is configured on the client.The clients IP address is on the wrong subnet.The client has an incorrect pre-shared key.The

38、 SSID is configured incorrectly on the client.Answer: DSection: Chapter 11: WirelessExplanation/Reference:客户端无法连接到无限接入点，查看不到可用的无线信号。这通常是SSID 信号没有配置正确。A：不正确的信道。错误 B：客户端的IPC：客户端的共享keyD：SSIDQUESTION 35Which two features did WPAv1 add to address the inherent weaknesses found in WEP(Choose two.)哪两个功能 WPA

39、v1 没有添加地址找到 wep 的固有弱点？（选择两个a stronger encryption algorithmkey mixing using temporal keysshared key authenticationa shorter initialization vectorper frame sequence countersAnswer: BESection: Chapter 11: WirelessExplanation/Reference:考点：WPA1 中增加哪两个在WEPWEPA：更强的加密算法B：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

40、列计数器。QUESTION 36Which two wireless encryption methods are based on the RC4 encryption algorithm(Choose two.)WEPCCKMAESTKIPCCMP Answer: ADSection: Chapter 11: WirelessExplanation/Reference:考点：哪两种无限加密技术依靠RC4A:有线等效保密协议 B：英特尔开发一种协议 C：高级加密标准 D：临时密钥集成协议E:基于AESQUESTION 37What are two characteristics of RIP

41、v2 (Choose two.)classful routing protocolvariable-length subnet masksbroadcast addressingmanual route summarizationuses SPF algorithm to compute pathAnswer: BDSection: Chapter 6: IP RoutingExplanation/Reference:A：有类路由协议，错误 B：可变长度子网掩码，正确C：接受广播地址更新，错误D：手动路由汇总，正确E:使用spfQUESTION 38Which two Ethernet fib

42、er-optic modes support distances of greater than 550 meters1000BASE-CX100BASE-FX1000BASE-LX1000BASE-SX1000BASE-ZXAnswer: CESection: Chapter 1: IntroductionExplanation/Reference:A：25B：100C：3000D：550E：70QUESTION 39What two things will a router do when running a distance vector routing protocol(Choose

43、two.)Send periodic updates regardless of topology changes.Send entire routing table to all routers in the routing domain.Use the shortest-path algorithm to the determine best path.Update the routing table based on updates from their neighbors.Maintain the topology of the entire network in its databa

44、se.Answer: ADSection: Chapter 6: IP RoutingExplanation/Reference:考点：考查距离矢量路由协议特性 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：在数据库中维护整个网络的拓扑。错误QUESTION 40Refer to the exhibit. According to the routing table, where will the router senda packet destined forAnswer: CSection: C

45、hapter 6: IP RoutingExplanation/Reference:路由查找原则：最长掩码匹配原则。QUESTION 41Which command shows if an access list is assigned to an interfaceshow ip interface interface access-listsshow ip access-lists interface interfaceshow ip interface interfaceshow ip access-lists interfaceAnswer: CSection: Chapter 7:

46、SecurityExplanation/Reference:QUESTION 42Refertotheexhibit.WhichruledoestheDHCPserverusewhenthereisanIPaddressconflictThe address is removed from the pool until the conflict is resolved.The address remains in the pool until the conflict is resolved.Only the IP detected by Gratuitous ARP is removed f

47、rom the pool.Only the IP detected by Ping is removed from the pool.The IP will be shown, even after the conflict is resolved.Answer: ASection: Chapter 5: Managing Cisco IOSExplanation/Reference:show ip dhcp conflictip有冲突的地址不再安排出去。A：地址被删除直到冲突解决，正确B:地址保留直到冲突解决，错误C/D：答案片面。E：当冲突解决后，地址会被显示。错误。QUESTION 43

48、Refer to the exhibit. You are connected to the router as user Mike. Which commandallows you to seeoutput from the OSPF debug commandterminal monitorshow debuggingshow sessionsshow ip ospf interfaceAnswer: ASection: Chapter 6: IP RoutingExplanation/Reference:A：让debugB：没这条命令 C：查看会话信息。D:查看启用了ospfQUESTI

49、ON 44Refer to the exhibit. If number 2 is selected from the setup script, what happenswhen the user runs setupfrom a privileged promptSetup is additive and any changes will be added to the config script.Setup effectively starts the configuration over as if the router was bootedfor the first time.Set

50、up will not run if an enable secret password exists on the router.Setup will not run, because it is only viable when no configuration exists onthe router.Answer: ASection: Chapter 4: Introduction to Cisco IOSExplanation/Reference:0不保存进入IOS1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脚本 B：为有效地重新开头配置，假如路由器是第一次启动的配置。C：

51、假如配置了密码，设置不会运行 D：设置不行用，由于它只能在没有配置存在时才有效。QUESTION 45Refer to the exhibit. Which (config-router) command will allow the networkrepresented on the interface tobe advertised by RIPredistribute ethernet0network ethernet0Answer: DSection: Chapter 6: IP RoutingExplanation/Reference:考点：怎么才能让接口通告RIPnetworkQU

52、ESTION 46Refer to the exhibit. What information can be gathered from the outputA. One router is running RIPv1.C. The network contains a loop.Answer: DSection: Chapter 6: IP RoutingExplanation/Reference:QUESTION 47Refertotheexhibit.WhattypeofconnectionwouldbesupportedbythecablediagramshownPC to route

53、rPC to switchserver to routerrouter to routerAnswer: BSection: Chapter 1: IntroductionExplanation/Reference:从图中可以看出这是一条直通线。同构设备使用交叉线，异构设备使用直通线。B：直通线AC/DQUESTION 48Refertotheexhibit.WhattypeofconnectionwouldbesupportedbythecablediagramshownPC to routerPC to switchserver to switchswitch to routerAnswe

54、r: ASection: Chapter 1: IntroductionExplanation/Reference:QUESTION 49Which two statements describe the Cisco implementation of VLANs (Choose two.)VLAN 1 is the default Ethernet VLAN.CDP advertisements are only sent on VLAN 1002.By default, the management VLAN is VLAN 1005.By default, the switch IP a

55、ddress is in VLAN 1005.VLAN 1002 through 1005 are automatically created and cannot be deleted.Answer: AESection: (none) Explanation/Reference:考点：考查vlanA：缺省都存在vlan1，端口都属于vlan1，正确B：CDP 信息只发送到vlan1002，错误，vlan1002 是fddi 网络的vlanCIP配置在vlan100vlan1005trnet网络的vlan里面。QUESTION 50Refer to the exhibit. What can

56、 be determined about the router from the consoleoutputNo configuration file was found in NVRAM.No configuration file was found in flash.No configuration file was found in the PCMCIA card.Configuration file is normal and will load in 15 seconds.Answer: ASection: Chapter 4: Introduction to Cisco IOSEx

57、planation/Reference:启动时缺省读取保存在NVRAM 里面的配置文件QUESTION 51Refer to the exhibit. What can be determined from the outputAnswer: BSection: Chapter 4: Introduction to Cisco IOSExplanation/Reference:ageQUESTION 52Refer to the exhibit. Which command would allow the translations to be createdon the routerAnswe

58、r: ASection: Chapter 8: NATExplanation/Reference:2119.QUESTION 53shown. At which OSI layer is the problemdata link layerapplication layeraccess layersession layernetwork layerAnswer: ESection: Chapter 2: TCP/IPExplanation/Reference:pingicmp，pingQUESTION 54Refer to the exhibit. Which value will be co

59、nfigured for Default Gateway of theLocal Area ConnectionAnswer: BSection: Chapter 3: IP Addressing and VLSMExplanation/Reference:QUESTION 55Refer to the exhibit. The user at Workstation B reports that Server A cannot bereached. What ispreventing Workstation B from reaching Server AThe IP address for

60、 Server A is a broadcast address.The IP address for Workstation B is a subnet address.The gateway for Workstation B is not on the same subnet.The gateway for Server A is not on the same subnet.Answer: DSection: Chapter 6: IP RoutingExplanation/Reference:QUESTION 56Refer to the exhibit. What does the