CCNA(640-802)题库V1044

ExamAQUESTION1Whenyouareloggedintoaswitch,whichpromptindicatesthatyouareinprivilegedmode?A.%B.@C.>D.$E.#Answer:ESection:Chapter4:IntroductiontoCiscoIOSExplanation/Reference:特权模式就是#提示符QUESTION2Whichcommandshowssystemhardwareandsoftwareversioninformation?A.showconfigurationB.showenvironmentC.showinventoryD.showplatformE.showversionAnswer: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?A.802.1Qgiantsframescouldsaturatethelink.B.VLAN10onCAT1andVLAN1onCAT2willsenduntaggedframes.C.AnativeVLANmismatcherrormessagewillappear.D.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QUESTION4Whichcommandwouldcorrectlyconfigureaserialportonarouterwiththelastusablehostaddressinthe192.216.32.32/29subnet?A.Router(config-if)#ipaddress192.216.32.38255.255.255.240B.Router(config-if)#ipaddress192.216.32.39255.255.255.224C.Router(config-if)#ipaddress192.216.32.63255.255.255.248D.Router(config-if)#ipaddress192.216.32.39255.255.255.248E.Router(config-if)#ipaddress192.216.32.63255.255.255.248F.Router(config-if)#ipaddress192.216.32.38255.255.255.248Answer:FSection:Chapter4:IntroductiontoCiscoIOSExplanation/Reference:192.216.32.32/29它的块大小为8掩码为255.255.255.248地址范围为192.216.32.32-39QUESTION5ThenetworkdefaultgatewayapplyingtoahostbyDHCPis192.168.5.33/28.WhichoptionisthevalidIPaddressofthishost?A.192.168.5.55B.192.168.5.47C.192.168.5.40D.192.168.5.32E.192.168.5.14Answer:CSection:Chapter3:IPAddressingandVLSMExplanation/Reference:考点：考查VLSM192.168.5.33/28所在网段的范围是192.168.5.32--192.168.5.47/28A：超出范围B：广播地址C：正确D：网络号E：超出范围QUESTION6Whichtwoaddressescanbeassignedtoahostwithasubnetmaskof255.255.254.0?(Choosetwo.)A.113.10.4.0B.186.54.3.0C.175.33.3.255D.26.35.2.255E.17.35.36.0Answer: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?A.10.1.1.1B.127.0.0.1C.192.168.0.1D.239.1.1.1Answer:BSection:Chapter3:IPAddressingandVLSMExplanation/Reference:考点：使用ping来检测主机的IP栈。ping127.0.0.1实现。QUESTION8WorkstationAhasbeenassignedanIPaddressof192.0.2.24/28.WorkstationBhasbeenassignedanIPaddressof192.0.2.100/28.Thetwoworkstationsareconnectedwithastraight-throughcable.Attemptstopingbetweenthehostsareunsuccessful.Whattwothingscanbedonetoallowcommunicationsbetweenthehosts?(Choosetwo.)A.Replacethestraight-throughcablewithacrossovercable.B.Changethesubnetmaskofthehoststo/25.C.Changethesubnetmaskofthehoststo/26.D.ChangetheaddressofWorkstationAto192.0.2.15.E.ChangetheaddressofWorkstationBto192.0.2.111.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。QUESTION9YourISPhasgivenyoutheaddress223.5.14.6/29toassigntoyourrouter'sinterface.Theyhavealsogivenyouthedefaultgatewayaddressof223.5.14.7.Afteryouhaveconfiguredtheaddress,therouterisunabletopinganyremotedevices.Whatispreventingtherouterfrompingingremotedevices?A.Thedefaultgatewayisnotanaddressonthissubnet.B.Thedefaultgatewayisthebroadcastaddressforthissubnet.C.TheIPaddressisthebroadcastaddressforthissubnet.D.TheIPaddressisaninvalidclassDmulticastaddress.Answer:BSection:Chapter3:IPAddressingandVLSMExplanation/Reference:考点：考查VLSM。223.5.14.6/29所在网段的范围是：223.5.14.0--223.5.14.7/29A：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?A.copyrunning-configstartup-configB.copystartup-config:running-config:C.copyrunningconfigstartupconfigD.copystartupconfigrunningconfigE.writeterminalAnswer:ASection:Chapter4:IntroductiontoCiscoIOSExplanation/Reference:QUESTION11WhichcommandisusedtoloadaconfigurationfromaTFTPserverandmergetheconfigurationintoRAM?A.copyrunning-config:TFTP:B.copyTFTP:running-configC.copyTFTP:startup-configD.copystartup-config:TFTP:Answer:BSection:Chapter4:IntroductiontoCiscoIOSExplanation/Reference:QUESTION12Asystemadministratortypesthecommandtochangethehostnameofarouter.WhereontheCiscoIFSisthatchangestored?A.NVRAMB.RAMC.FLASHD.ROME.PCMCIAAnswer:BSection:Chapter4:IntroductiontoCiscoIOSExplanation/Reference:running-config保存在RAM中startup-config保存在NVRAM中QUESTION13Whichcommandisusedtoconfigureadefaultroute?A.iproute172.16.1.0255.255.255.00.0.0.0B.iproute172.16.1.0255.255.255.0172.16.2.1C.iproute0.0.0.0255.255.255.0172.16.2.1D.iproute0.0.0.00.0.0.0172.16.2.1Answer:DSection:Chapter6:IPRoutingExplanation/Reference:QUESTION14IfIProutingisenabled,whichtwocommandssetthegatewayoflastresorttothedefaultgateway?(Choosetwo.)A.ipdefault-gateway0.0.0.0B.iproute172.16.2.10.0.0.00.0.0.0C.ipdefault-network0.0.0.0D.ipdefault-route0.0.0.00.0.0.0172.16.2.1E.iproute0.0.0.00.0.0.0172.16.2.1Answer:CESection:Chapter6:IPRoutingExplanation/Reference:产生默认网关的两种方式ipdefault-networkiprouteQUESTION15WhichcommandwouldyouconfiguregloballyonaCiscorouterthatwouldallowyoutoviewdirectlyconnectedCiscodevices?A.enablecdpB.cdpenableC.cdprunD.runcdpAnswer:CSection:Chapter5:ManagingCiscoIOSExplanation/Reference:QUESTION16WhichcommandisusedtoseethepathtakenbypacketsacrossanIPnetwork?A.showiprouteB.showrouteC.tracerouteD.traceiprouteAnswer: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?A.debugicmpB.debugipicmpC.debugtcpD.debugpacketAnswer:BSection:Chapter5:ManagingCiscoIOSExplanation/Reference:ping调用了icmp协议，而icmp数据包封装在ip包中。QUESTION18WhichcommanddisplaysCPUutilization?A.showprotocolsB.showprocessC.showsystemD.showversionAnswer:BSection:Chapter5:ManagingCiscoIOSExplanation/Reference:查看CPU利用率。QUESTION19Whenconfiguringaserialinterfaceonarouter,whatisthedefaultencapsulation?A.atm-dxiB.frame-relayC.hdlcD.lapbE.pppAnswer:CSection:Chapter14:WideAreaNetwork(WAN)Explanation/Reference:缺省封装是HDLCQUESTION20Whatmustbesetcorrectlywhenconfiguringaserialinterfacesothathigher-levelprotocolscalculatethebestroute?A.bandwidthB.delayC.loadD.reliabilityAnswer: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?A.minimumcellrate(MCR)B.qualityofservice(QoS)C.modulationD.packetswitchingexchange(PSE)E.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?A.transportB.networkC.presentationD.sessionE.applicationAnswer: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?A.presentationB.sessionC.transportD.networkE.physicalAnswer:DSection:Chapter1:IntroductionExplanation/Reference:解决网络问 题 快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题 ，先确保网络层通信。QUESTION24WhichprotocolsarefoundinthenetworklayeroftheOSIreferencemodelandareresponsibleforpathdeterminationandtrafficswitching?A.LANB.routingC.WAND.networkAnswer: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?A.showreloadB.showbootC.showrunning-configD.showversionAnswer: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.)A.PPPB.WAPC.HDLCD.MPLSE.L2TPv3F.ATMAnswer: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?A.ATMB.HDLCC.FrameRelayD.PPPAnswer: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?A.ACSU/DSUconvertsanalogsignalsfromaroutertoaleasedline;amodemconvertsanalogsignalsfromaroutertoaleasedline.B.ACSU/DSUconvertsanalogsignalsfromaroutertoaphoneline;amodemconvertsdigitalsignalsfromaroutertoaleasedline.C.ACSU/DSUconvertsdigitalsignalsfromaroutertoaphoneline;amodemconvertsanalogsignalsfromaroutertoaphoneline.D.ACSU/DSUconvertsdigitalsignalsfromaroutertoaleasedline;amodemconvertsdigitalsignalsfromaroutertoaphoneline.Answer:DSection:Chapter14:WideAreaNetwork(WAN)Explanation/Reference:CSU/DSU一般是专线，MODEN是将模拟信号与数字信号转换QUESTION29Anetworkadministratormustconfigure200switchportstoaccepttrafficfromonlythecurrentlyattachedhostdevices.WhatwouldbethemostefficientwaytoconfigureMAC-levelsecurityonalltheseports?A.VisuallyverifytheMACaddressesandthentelnettotheswitchestoentertheswitchport-portsecuritymac-addresscommand.B.Haveenduserse-mailtheirMACaddresses.Telnettotheswitchtoentertheswitchport-portsecuritymac-addresscommand.C.Usetheswitchportport-securityMACaddressstickycommandonalltheswitchportsthathaveenddevicesconnectedtothem.D.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。QUESTION30WhentroubleshootingaFrameRelayconnection,whatisthefirststepwhenperformingaloopbacktest?A.SettheencapsulationoftheinterfacetoHDLC.B.PlacetheCSU/DSUinlocal-loopmode.C.Enablelocal-loopmodeontheDCEFrameRelayrouter.D.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?A.AllTCPtrafficismarkeddiscardeligible.B.AllUDPtrafficismarkeddiscardeligibleandaBECNissent.C.AllTCPtrafficismarkeddiscardeligibleandaBECNissent.D.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.)A.Theycreatesplit-horizonissues.B.Theyrequireauniquesubnetwithinaroutingdomain.C.Theyemulateleasedlines.D.Theyareidealforfull-meshtopologies.E.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.Addresseswithintherange10.10.10.0/24arenotbeingtranslatedtothe1.128.0/16range.Whichcommandshowsif10.10.10.0/24areallowedinsideaddresses?A.debugipnatB.showaccess-listC.showipnattranslationD.showipnatstatisticsAnswer:BSection:Chapter8:NATExplanation/Reference:那条命令可以看到10.10.10.0/24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，错误。D：查看静态NAT。错误QUESTION34Awirelessclientcannotconnecttoan802.11b/gBSSwithab/gwirelesscard.TheclientsectionoftheaccesspointdoesnotlistanyactiveWLANclients.Whatisapossiblereasonforthis?A.Theincorrectchannelisconfiguredontheclient.B.Theclient'sIPaddressisonthewrongsubnet.C.Theclienthasanincorrectpre-sharedkey.D.TheSSIDisconfiguredincorrectlyontheclient.Answer:DSection:Chapter11: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IP地址配置错误C：客户端的共享key错误。D：SSID配置不正确。QUESTION35WhichtwofeaturesdidWPAv1addtoaddresstheinherentweaknessesfoundinWEP?(Choosetwo.)A.astrongerencryptionalgorithmB.keymixingusingtemporalkeysC.sharedkeyauthenticationD.ashorterinitializationvectorE.perframesequencecountersAnswer:BESection:Chapter11:WirelessExplanation/Reference:考点：WPA1中增强哪两个在WEP中发现的弱点？WEP存在的隐患主要是依赖共享密钥A：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：一个帧一个序列计数器。QUESTION36WhichtwowirelessencryptionmethodsarebasedontheRC4encryptionalgorithm?(Choosetwo.)A.WEPB.CCKMC.AESD.TKIPE.CCMPAnswer:ADSection:Chapter11:WirelessExplanation/Reference:考点：哪两种无限加密技术依赖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 excel标准偏差excel标准偏差函数exl标准差函数国标检验抽样标准表免费下载红头文件格式标准下载 D：暂时密钥集成协议E:基于AES的加密方式QUESTION37WhataretwocharacteristicsofRIPv2?(Choosetwo.)A.classfulroutingprotocolB.variable-lengthsubnetmasksC.broadcastaddressingD.manualroutesummarizationE.usesSPFalgorithmtocomputepathAnswer:BDSection:Chapter6:IPRoutingExplanation/Reference: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。QUESTION38WhichtwoEthernetfiber-opticmodessupportdistancesofgreaterthan550meters?A.1000BASE-CXB.100BASE-FXC.1000BASE-LXD.1000BASE-SXE.1000BASE-ZXAnswer:CESection:Chapter1:IntroductionExplanation/Reference:A：最长距离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QUESTION39Whattwothingswillarouterdowhenrunningadistancevectorroutingprotocol?(Choosetwo.)A.Sendperiodicupdatesregardlessoftopologychanges.B.Sendentireroutingtabletoallroutersintheroutingdomain.C.Usetheshortest-pathalgorithmtothedeterminebestpath.D.Updatetheroutingtablebasedonupdatesfromtheirneighbors.E.Maintainthetopologyoftheentirenetworkinitsdatabase.Answer:ADSection:Chapter6:IPRoutingExplanation/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QUESTION40Refertotheexhibit.Accordingtotheroutingtable,wherewilltheroutersendapacketdestinedfor10.1.5.65?A.10.1.1.2B.10.1.2.2C.10.1.3.3D.10.1.4.4Answer:CSection:Chapter6:IPRoutingExplanation/Reference:路由查找原则：最长掩码匹配原则。QUESTION41Whichcommandshowsifanaccesslistisassignedtoaninterface?A.showipinterface[interface]access-listsB.showipaccess-listsinterface[interface]C.showipinterface[interface]D.showipaccess-lists[interface]Answer:CSection:Chapter7:SecurityExplanation/Reference:QUESTION42Refertotheexhibit.WhichruledoestheDHCPserverusewhenthereisanIPaddressconflict?A.Theaddressisremovedfromthepooluntiltheconflictisresolved.B.Theaddressremainsinthepooluntiltheconflictisresolved.C.OnlytheIPdetectedbyGratuitousARPisremovedfromthepool.D.OnlytheIPdetectedbyPingisremovedfromthepool.E.TheIPwillbeshown,evenaftertheconflictisresolved.Answer:ASection:Chapter5:ManagingCiscoIOSExplanation/Reference:showipdhcpconflict命令可以查看哪些ip地址在使用上有冲突。有冲突的地址不再分配出去。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 八年级地理上册填图题岩土工程勘察试题省略号的作用及举例应急救援安全知识车间5s试题及答案 片面。E：当冲突解决后，地址会被显示。错误。QUESTION43Refertotheexhibit.YouareconnectedtotherouterasuserMike.WhichcommandallowsyoutoseeoutputfromtheOSPFdebugcommand?A.terminalmonitorB.showdebuggingC.showsessionsD.showipospfinterfaceAnswer:ASection:Chapter6:IPRoutingExplanation/Reference: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。QUESTION44Refertotheexhibit.Ifnumber2isselectedfromthesetupscript,whathappenswhentheuserrunssetupfromaprivilegedprompt?A.Setupisadditiveandanychangeswillbeaddedtotheconfigscript.B.Setupeffectivelystartstheconfigurationoverasiftherouterwasbootedforthefirsttime.C.Setupwillnotrunifanenablesecretpasswordexistsontherouter.D.Setupwillnotrun,becauseitisonlyviablewhennoconfigurationexistsontherouter.Answer:ASection:Chapter4:IntroductiontoCiscoIOSExplanation/Reference:[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脚本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：如果配置了密码，设置不会运行D：设置不可用，因为它只能在没有配置存在时才有效。QUESTION45Refertotheexhibit.Which(config-router)commandwillallowthenetworkrepresentedontheinterfacetobeadvertisedbyRIP?A.redistributeethernet0B.networkethernet0C.redistribute10.12.0.0D.network10.12.0.0Answer:DSection:Chapter6:IPRoutingExplanation/Reference:考点：怎么才能让接口通告RIP路由。通告network网段实现。QUESTION46Refertotheexhibit.Whatinformationcanbegatheredfromtheoutput?A.OnerouterisrunningRIPv1.B.RIPneighboris224.0.0.9.C.Thenetworkcontainsaloop.D.Network10.10.1.0isreachable.Answer:DSection:Chapter6:IPRoutingExplanation/Reference:由图中可以看出本地已经存在10.10.1.0这条路由。QUESTION47Refertotheexhibit.Whattypeofconnectionwouldbesupportedbythecablediagramshown?A.PCtorouterB.PCtoswitchC.servertorouterD.routertorouterAnswer:BSection:Chapter1: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/D同构设备使用交叉线QUESTION48Refertotheexhibit.Whattypeofconnectionwouldbesupportedbythecablediagramshown?A.PCtorouterB.PCtoswitchC.servertoswitchD.switchtorouterAnswer:ASection:Chapter1:IntroductionExplanation/Reference:QUESTION49WhichtwostatementsdescribetheCiscoimplementationofVLANs?(Choosetwo.)A.VLAN1isthedefaultEthernetVLAN.B.CDPadvertisementsareonlysentonVLAN1002.C.Bydefault,themanagementVLANisVLAN1005.D.Bydefault,theswitchIPaddressisinVLAN1005.E.VLAN1002through1005areautomaticallycreatedandcannotbedeleted.Answer:AESection:(none)Explanation/Reference:考点：考查vlan知识点。A：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。QUESTION50Refertotheexhibit.Whatcanbedeterminedabouttherouterfromtheconsoleoutput?A.NoconfigurationfilewasfoundinNVRAM.B.Noconfigurationfilewasfoundinflash.C.NoconfigurationfilewasfoundinthePCMCIAcard.D.Configurationfileisnormalandwillloadin15seconds.Answer:ASection:Chapter4:IntroductiontoCiscoIOSExplanation/Reference:启动时缺省读取保存在NVRAM里面的配置文件。提示进入对话模式，说明没有保存配置文件。QUESTION51Refertotheexhibit.Whatcanbedeterminedfromtheoutput?A.192.168.1.2islocaltotherouter.B.192.168.3.1islocaltotherouter.C.192.168.1.2willageoutinlessthan1minute.D.192.168.3.1hasagedoutandismarkedfordeletion.Answer:BSection:Chapter4:IntroductiontoCiscoIOSExplanation/Reference:age下面-代表是本地端口QUESTION52Refertotheexhibit.Whichcommandwouldallowthetranslationstobecreatedontherouter?A.ipnatpoolmynats1.1.128.11.1.135.254prefix-length19B.ipnatoutsidemynats1.1.128.11.1.135.254prefix-length19C.ipnatpoolmynats1.1.128.11.1.135.254prefix-length18D.ipnatoutsidemynats1.1.128.11.1.135.254prefix-length18Answer:ASection:Chapter8:NATExplanation/Reference:prefix-length表示掩码的长度。prefix-length19表示掩码为255.255.224.0QUESTION53Refertotheexhibit.Anadministratorpingsthedefaultgatewayat10.10.10.1andseestheoutputasshown.AtwhichOSIlayeristheproblem?A.datalinklayerB.applicationlayerC.accesslayerD.sessionlayerE.networklayerAnswer:ESection:Chapter2:TCP/IPExplanation/Reference:ping调用icmp，ping不通是网络层的原因。QUESTION54Refertotheexhibit.WhichvaluewillbeconfiguredforDefaultGatewayoftheLocalAreaConnection?A.10.0.0.0B.10.0.0.254C.192.223.129.0D.192.223.129.254Answer:BSection:Chapter3:IPAddressingandVLSMExplanation/Reference:10.0.0.1--10.0.0.254里面除了10.0.0.249外任意一个。QUESTION55Refertotheexhibit.TheuseratWorkstationBreportsthatServerAcannotbereached.WhatispreventingWorkstationBfromreachingServerA?A.TheIPaddressforServerAisabroadcastaddress.B.TheIPaddressforWorkstationBisasubnetaddress.C.ThegatewayforWorkstationBisnotonthesamesubnet.D.ThegatewayforServerAisnotonthesamesubnet.Answer:DSection:Chapter6:IPRoutingExplanation/Reference:131.1.123.24/27所在网络范围为：131.1.123.0-31/27。很明显网关131.1.123.33不再范围内。QUESTION56Refertotheexhibit.Whatdoesthe(*)representintheoutput?A.Packetisdestinedforalocalinterfacetotherouter.B.Packetwastranslated,butnoresponsewasreceivedfromthedistantdevice.C.Packetwasnottranslated,becausenoadditionalportsareavailable.D.Packetwastranslatedandfastswitchedtothedestination.Answer:DSection:Chapter8:NATExplanation/Reference:由图中提示信息可以看出，源为10.10.0.2已经有个一个转换，所以后续的数据包快速转发。QUESTION57Refertotheexhibit.WhatcommandsequencewillenablePATfromtheinsidetooutsidenetwork?A.(config)ipnatpoolisp-net1.2.4.2netmask255.255.255.0overloadB.(config-if)ipnatoutsideoverloadC.(config)ipnatinsidesourcelist1interfaceethernet1overloadD.(config-if)ipnatinsideoverloadAnswer:CSection:Chapter8:NATExplanation/Reference:overload是配置PAT的关键字QUESTION58Refertotheexhibit.WhatwillhappentoHTTPtrafficcomingfromtheInternetthatisdestinedfor172.16.12.10ifthetrafficisprocessedbythisACL?A.Trafficwillbedroppedperline30oftheACL.B.Trafficwillbeacceptedperline40oftheACL.C.Trafficwillbedropped,becauseoftheimplicitdenyallattheendof