CISCO-CCNA网络工程师题库

培训大讲堂官方YY频道：3660mCCNA题库考试代号：640-802考试时间：英文110+30=140分钟通过分数：825题库版本：V104.4鸿鹄论坛招募CCNA、CCNP答疑讲师答疑地点：鸿鹄官方YY频道3660鸿鹄大讲堂：CCNA题库战报交流QQ群：144288127（500人超级群）CCNA题库战报交流区：1000G视频教程免费下载：CCNA（640-802）题库V104.4CCNA（640-802）题库V104.4（情人节版）CCNA题库战报500人超级QQ群144288127V104系列是官方的终结版本，以后不会再出V105V106V108等等CCNA最新题库/最新战报发布区：下载官方正版题库、看最新考试战报，请随时关注鸿鹄论坛CCNA考试报名1900，详情请联系鸿鹄全国区十七名客服QQ7120206更新内容：V104.1修正V104中错误题目，确定经典争议题目答案；V104.2增加拖图题并可完美模拟考试，VCE题库增加中文注释；V104.3针对思科CCNA考试变题，更新考试新增题目93Q,更新V104.2实验题；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，为目前最新官方正版题库;2011.8.1增加每日新题，修订部分错误。2012.2.14情人节版增加5道新题，分别是519、520、521、522、523题修改176题、375题、443题、482题答案错误修改59题、88题、453题、107题、270题注释错误增加个别疑难拖图题注释，优化实验题QUESTION1Whenyouareloggedintoaswitch,whichpromptindicatesthatyouareinprivilegedmode?（当您登录到交换机，哪种提示表明你在特权模式？）%TOC\o"1-5"\h\z@>$#Answer:ESection:Chapter4:IntroductiontoCiscoIOSExplanation/Reference:特权模式就是#提示符QUESTION2Whichcommandshowssystemhardwareandsoftwareversioninformation?（哪些命令显示系统硬件和软件的版本信息？）showconfigurationshowenvironmentshowinventoryshowplatformshowversionAnswer:ESection:Chapter4:IntroductiontoCiscoIOSExplanation/Reference:查看系统的软件和硬件信息使用的命令是showversionQUESTION3CiscoCatalystswitchesCAT1andCAT2haveaconnectionbetweenthemusingportsFA0/13.An802.1Qtrunkisconfiguredbetweenthetwoswitches.OnCAT1,VLAN10ischosenasnative,butonCAT2thenativeVLANisnotspecified.Whatwillhappeninthisscenario?(思科Catalyst交换机CAT1和CAT2有它们之间的连接使用端口FA0/13。两个交换机之间用802.1Q中继配置，CAT1做为VLAN10的主机，但在CAT2上的本地VLAN未指定。在这种情况下会发生什么？)802.1Qgiantsframescouldsaturatethelink.VLAN10onCAT1andVLAN1onCAT2willsenduntaggedframes.AnativeVLANmismatcherrormessagewillappear.VLAN10onCAT1andVLAN1onCAT2willsendtaggedframes.Answer:CSection:Chapter10:VLANExplanation/Reference:如果两边native不匹配的话.switch将报native不匹配的日志信息QUESTION4Whichcommandwouldcorrectlyconfigureaserialportonarouterwiththelastusablehostaddressinthe2/29subnet?(哪个命令正确地将最后的可用主机地址，2/29子网的路由器上配置的串行端口？)Router(config-if)#ipaddress840Router(config-if)#ipaddress924Router(config-if)#ipaddress348Router(config-if)#ipaddress948Router(config-if)#ipaddress348Router(config-if)#ipaddress848Answer:FSection:Chapter4:IntroductiontoCiscoIOSExplanation/Reference:2/29它的块大小为8掩码为48地址范围为2-39QUESTION5ThenetworkdefaultgatewayapplyingtoahostbyDHCPis3/28.WhichoptionisthevalidIPaddressofthishost?(应用到由DHCP主机的网络默认网关是3V28。哪个选项是有效的主机IP地址？)57024Answer:CSection:Chapter3:IPAddressingandVLSMExplanation/Reference:考点：考查VLSM3/28所在网段的范围是2--7/28A：超出范围B：广播地址C：正确D：网络号E：超出范围QUESTION6Whichtwoaddressescanbeassignedtoahostwithasubnetmaskof?(Choosetwo.){哪两个地址可以分配给与子网掩码的主机？}5555Answer:BDSection:Chapter3:IPAddressingandVLSMExplanation/Reference:考点：考查VLSMA：网络号B/D：正确C：广播地址E：网络号QUESTION7Thenetworkadministratorhasaskedyoutocheckthestatusoftheworkstation'sIPstackbypingingtheloopbackaddress.Whichaddresswouldyoupingtoperformthistask?｛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:Chapter3:IPAddressingandVLSMExplanation/Reference:考点：使用ping来检测主机的IP栈。ping实现。QUESTION8WorkstationAhasbeenassignedanIPaddressof4/28.WorkstationBhasbeenassignedanIPaddressof00/28.Thetwoworkstationsareconnectedwithastraight-throughcable.Attemptstopingbetweenthehostsareunsuccessful.Whattwothingscanbedonetoallowcommunicationsbetweenthehosts?(Choosetwo.)｛A工作站已分配IP地址为4\/28。B工作站已分配IP地址为00\/28。两台工作站与直通电缆连接。在主机之间ping不成功。允许在主机之间的通信，可以做两件事情？(选择两个)。｝Replacethestraight-throughcablewithacrossovercable.Changethesubnetmaskofthehoststo/25.Changethesubnetmaskofthehoststo/26.ChangetheaddressofWorkstationAto5.ChangetheaddressofWorkstationBto11.Answer:ABSection:Chapter3:IPAddressingandVLSMExplanation/Reference:考点：同构设备使用交叉线，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：修改掩码为25位，正确。C：修改掩码为26为，错误。不能使他们在同一个子网。D/E：错误，都不能使他们在同一个子网。QUESTION9YourISPhasgivenyoutheaddress/29toassigntoyourrouter'sinterface.Theyhavealsogivenyouthedefaultgatewayaddressof.Afteryouhaveconfiguredtheaddress,therouterisunabletopinganyremotedevices.Whatispreventingtherouterfrompingingremotedevices?(您的ISP给你要分配给您的路由器接口地址\/29。他们还授予您是的默认网关地址。您已配置了地址后，路由器是无法ping任何远程设备。什么在阻碍pinging远程设备的路由器？)Thedefaultgatewayisnotanaddressonthissubnet.Thedefaultgatewayisthebroadcastaddressforthissubnet.TheIPaddressisthebroadcastaddressforthissubnet.TheIPaddressisaninvalidclassDmulticastaddress.Answer:BSection:Chapter3:IPAddressingandVLSMExplanation/Reference:考点：考查VLSM。/29所在网段的范围是：--/29A：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。QUESTION10WhichcommandisusedtocopytheconfigurationfromRAMintoNVRAM?｛哪个命令用于从RAM复制到NVRAM的配置｝copyrunning-configstartup-configcopystartup-config:running-config:copyrunningconfigstartupconfigcopystartupconfigrunningconfigwriteterminalAnswer:ASection:Chapter4:IntroductiontoCiscoIOSExplanation/Reference:QUESTION11WhichcommandisusedtoloadaconfigurationfromaTandmergetheconfigurationintoRAM?（于从TFTP服务器加载配置或合并到RAM的配置？）copyrunning-config:TFTP:copyTFTP:running-configcopyTFTP:startup-configcopystartup-config:TFTP:Answer:BSection:Chapter4:IntroductiontoCiscoIOSExplanation/Reference:QUESTION12Asystemadministratortypesthecommandtochangethehostnameofarouter.WhereontheCiscoIFSisthatchangestored?NVRAMRAMFLASHROMPCMCIAAnswer:BSection:Chapter4:IntroductiontoCiscoIOSExplanation/Reference:running-config保存在RAM中startup-config保存在NVRAM中QUESTION13Whichcommandisusedtoconfigureadefaultroute?iprouteiprouteiprouteiprouteAnswer:DSection:Chapter6:IPRoutingExplanation/Reference:QUESTION14IfIProutingisenabled,whichtwocommandssetthegatewayoflastresorttothedefaultgateway?（IP路由，哪两个命令设置网关的最后到默认网关？）（Choosetwo.）ipdefault-gatewayiprouteipdefault-networkipdefault-routeiprouteAnswer:CESection:Chapter6:IPRoutingExplanation/Reference:产生默认网关的两种方式ipdefault-networkiprouteQUESTION15WhichcommandwouldyouconfiguregloballyonaCiscorouterthatwouldallowyoutoviewdirectlyconnectedCiscodevices?（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？）enablecdpcdpenablecdprunruncdpAnswer:CSection:Chapter5:ManagingCiscoIOSExplanation/Reference:QUESTION16WhichcommandisusedtoseethepathtakenbypacketsacrossanIPnetwork?（哪些命令用于看到通过IP网络数据包所采取的路径？）showiprouteshowroutetraceroutetraceiprouteAnswer:CSection:Chapter2: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QUESTION17Whichcommandisusedtodebugapingcommand?｛哪些命令用于调试ping命令？｝debugicmpdebugipicmpdebugtcpdebugpacketAnswer:BSection:Chapter5:ManagingCiscoIOSExplanation/Reference:ping调用了icmp协议，而icmp数据包封装在ip包中。QUESTION18WhichcommanddisplaysCPUutilization?｛哪个命令显示的CPU利用率呢？｝showprotocolsshowprocessshowsystemshowversionAnswer:BSection:Chapter5:ManagingCiscoIOSExplanation/Reference:查看CPU利用率。QUESTION19Whenconfiguringaserialinterfaceonarouter,whatisthedefaultencapsulation?｛在配置一个串行接口的路由器，什么是默认的封装？｝atm-dxiframe-relayhdlclapbpppAnswer:CSection:Chapter14:WideAreaNetwork(WAN)Explanation/Reference:缺省封装是HDLCQUESTION20Whatmustbesetcorrectlywhenconfiguringaserialinterfacesothathigher-levelprotocolscalculatethebestroute?｛什么时，必须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:Chapter6:IPRoutingExplanation/Reference:为了使高层路由协议计算最佳路由，串口的什么东西必须被设置正确？在接口下，只有带宽是可以配置的。QUESTION21AcompanyimplementsvideoconferencingoverIPontheirEthernetLAN.Theusersnoticethatthenetworkslowsdown,andthevideoeitherstuttersorfailscompletely.Whatisthemostlikelyreasonforthis?｛公司对他们的以太网LANip实现视频会议。用户注意网络变慢，和视频断断续续或完全失败。最有可能的原因是什么？｝minimumcellrate(MCR)qualityofservice(QoS)modulationpacketswitchingexchange(PSE)reliabletransportprotocol(RTP)Answer:BSection:Chapter9:SwitchingExplanation/Reference:考点：当网络中使用视频会议后发现网络非常慢，什么原因引起的？QoS:用于定制策略对不同流量进行控制。QUESTION22WhichlayerintheOSIreferencemodelisresponsiblefordeterminingtheavailabilityofthereceivingprogramandcheckingtoseeifenoughresourcesexistforthatcommunication?｛OSI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:Chapter1:IntroductionExplanation/Reference:哪一层确定的接收程序的可用性？应用层提供QUESTION23Datatransferisslowbetweenthesourceanddestination.ThequalityofservicerequestedbythetransportlayerintheOSIreferencemodelisnotbeingmaintained.Tofixthisissue,atwhichlayershouldthetroubleshootingprocessbegin?｛数据传输速度慢的源和目标之间。不保持在OSI参考模型的传输层所要求的服务质量。要解决此问题，在哪一层应故障排除过程开始？｝presentationsessiontransportnetworkphysicalAnswer:DSection:Chapter1:IntroductionExplanation/Reference:解决网络问题，先确保网络层通信。QUESTION24WhichprotocolsarefoundinthenetworklayeroftheOSIreferencemodelandareresponsibleforpathdeterminationandtrafficswitching?｛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:Chapter1:IntroductionExplanation/Reference:OSI网络层中什么提供了路径选择和流量转发？由路由协议提供。通过手工或者动态学习路由条目实现。QUESTION25Whichcommandrevealsthelastmethodusedtopowercyclearouter?showreloadshowbootshowrunning-configshowversionAnswer:DSection:Chapter5:ManagingCiscoIOSExplanation/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？QUESTION26WhichthreeoptionsarevalidWANconnectivitymethods?(Choosethree.)PPPWAPHDLCMPLSL2TPv3ATMAnswer:ACFSection:Chapter14:WideAreaNetwork(WAN)Explanation/Reference:哪三种封装属于WAN链路的？A: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。QUESTION27Refertotheexhibit.WhichWANprotocolisbeingused？Rout^rA^stwv.'irrc^rfat#po?iO/lJPdS«/O/Cisup”lineprotocol1supHardhflrciip«ckrcOver50netKccpaliVfis«t<10$tc)i詁I<nqs*nT24?JM8+i^I$T4trecvd2当740召9*l^.IupdrBrQJdcasrqueueo?5&.broidcA^^senc/droppEd?J7W14)7inputQ0:0m<K>"outputg：g：0Q,outputLtssiclearingof"ahoincerface"ccumters45皿耳nut电inputr^tit0biti/ioctOpaJJ*M)4CRCb0Fr苗e咅*0iiv^rrun,0igoAferiJJ*M)4CRCb0Fr苗e咅*0iiv^rrun,0igoAferi,27abcrf”oblpui.byt^E*Cund«rrun±0cutputerrori,0AppHqu?t0interfaceresets0cutpuLbufferfailures・Coutputbufferscur0CArrt«rtrnuliforu0parityf；4477］Srputerrors945抻壮曲pAcke($i__ATMHDLCFrameRelayPPPAnswer:CSection:Chapter14:WideAreaNetwork(WAN)Explanation/Reference:由图中的红线可看到发送接受LMI信息。属于FR的数据包。QUESTION28WhatisthedifferencebetweenaCSU/DSUandamodem?【一个CSU/DSU和调制解调器之间的区别是什么？】ACSU/DSUconvertsanalogsignalsfromaroutertoaleasedline;amodemconvertsanalogsignalsfromaroutertoaleasedline.ACSU/DSUconvertsanalogsignalsfromaroutertoaphoneline;amodemconvertsdigitalsignalsfromaroutertoaleasedline.ACSU/DSUconvertsdigitalsignalsfromaroutertoaphoneline;amodemconvertsanalogsignalsfromaroutertoaphoneline.ACSU/DSUconvertsdigitalsignalsfromaroutertoaleasedline;amodemconvertsdigitalsignalsfromaroutertoaphoneline.Answer:DSection:Chapter14:WideAreaNetwork(WAN)Explanation/Reference:CSU/DSU一般是专线，M0DEN是将模拟信号与数字信号转换QUESTION29Anetworkadministratormustconfigure200switchportstoaccepttrafficfromonlythecurrentlyattachedhostdevices.WhatwouldbethemostefficientwaytoconfigureMAC-levelsecurityonalltheseports?VisuallyverifytheMACaddressesandthentelnettotheswitchestoentertheswitchport-portsecuritymac-addresscommand.Haveenduserse-mailtheirMACaddresses.Telnettotheswitchtoentertheswitchport-portsecuritymac-addresscommand.Usetheswitchportport-securityMACaddressstickycommandonalltheswitchportsthathaveenddevicesconnectedtothem.［有端设备连接到他们的所有交换机端口上使用交换机端口端口安全MAC地址粘滞命令。］Useshowmac-address-tabletodeterminetheaddressesthatareassociatedwitheachportandthenenterthecommandsoneachswitchforMACaddressport-security.Answer:CSection:Chapter9:SwitchingExplanation/Reference:考点：有200台主机需要接入，采用什么方式来增强网络安全性？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。帧中继QUESTION30帧中继WhentroubleshootingaFrameRelayconnection,whatisthefirststepwhenperformingaloopbacktest?连接故障排除时，执行环回测试时的第一步是什么？】SettheencapsulationoftheinterfacetoHDLC.PlacetheCSU/DSUinlocal-loopmode.Enablelocal-loopmodeontheDCEFrameRelayrouter.VerifythattheencapsulationissettoFrameRelay.Answer:ASection:Chapter14:WideAreaNetwork(WAN)Explanation/Reference:在对FR进行排错的时候，当做回环测试的时候，第一步如何处理？A：讲接口配置成HDLC，正确，FR封装下无法正常ping自己端口QUESTION31WhatoccursonaFrameRelaynetworkwhentheCIRisexceeded?AllTCPtrafficismarkeddiscardeligible.AllUDPtrafficismarkeddiscardeligibleandaBECNissent.AllTCPtrafficismarkeddiscardeligibleandaBECNissent.AlltrafficexceedingtheCIRismarkeddiscardeligible.Answer:DSection:Chapter14:WideAreaNetwork(WAN)Explanation/Reference:在FR网络中，当CIR超过时会发生什么情况？D：所有超过的流量都丢弃。QUESTION32WhataretwocharacteristicsofFrameRelaypoint-to-pointsubinterfaces?(Choosetwo.)Theycreatesplit-horizonissues.Theyrequireauniquesubnetwithinaroutingdomain.Theyemulateleasedlines.Theyareidealforfull-meshtopologies.TheyrequiretheuseofNBMAoptionswhenusingOSPF.Answer:BCSection:Chapter14:WideAreaNetwork(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:全网互联是理想拓扑，错误。通常是hub-spokeE：NBMA不支持OSPF，错误。QUESTION33Refertotheexhibit.Addresseswithintherange/24arenotbeingtranslatedtothe1.128.0/16range.Whichcommandshowsif/24areallowedinsideaddresses?debugipnatshowaccess-listshowipnattranslationshowipnatstatisticsAnswer:BSection:Chapter8:NATExplanation/Reference:那条命令可以看到/24是否在允许转换范围。允许的范围是通过ACL定义的。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