CCNA考试题库中英文翻译版及答案

CCNA考试题库中英文翻译版及答案1[1]1.Whataretworeasonsthatanetworkadministratorwoulduseaccesslists?(Choosetwo.)1.出于哪两种理由，网络管理员会使用访问列表?A.tocontrolvtyaccessintoarouterA.控制通过VTY访问路由器B.tocontrolbroadcasttrafficthrougharouterB.控制广播流量穿越路由器2.一个默认的帧中继WAN被分类为哪种物理网络类型?A.point-to-pointA.点到点B.broadcastmulti-accessB.广播多路访问C.nonbroadcastmulti-accessC.非广播多路访问D.nonbroadcastmultipointD.非广播多点E.broadcastpoint-to-multipointE.广播点到多点Answer:C3.Asingle802.11gaccesspointhasbeenconfiguredandinstalledinthecenterofasquarAfewwirelessusersareexperiencingslowperformanceanddropswhilemostusersareoatpeakefficiency.Whatarethreelikelycausesofthisproblem?(Choosethree.)3.一个802.11接入点被部署在一个方形办公室的中央，当大多数用户在大流量传输数一些无线用户发现无线网络变得缓慢和出现丢包A.mismatchedTKIPencryptionB.nullSSIDC.cordlessphonesD.mismatchedSSIDE.metalfilecabinetsF.antennatypeordirectionAnswer:CEF4.Refertotheexhibit.Howmanybroadcastdomainsexistintheexhibitedtopology?根据下图，图中的拓扑中存在多少个广播域?A.oneA.1B.twoB.2C.threeC.3D.fourD.4E.fiveE.5F.sixF.6Answer:C5.Refertotheexhibit.WhattwofactscanbedeterminedfromtheWLANdiagram?(Choosetwo.)5.根据下图，WLANdiagram决定了哪两个事实A.Theareaofoverlapofthetwocellsrepresentsabasicserviceset(BSS).A.两个cells的overlap的区域描述了一个basicservicesetB.Thenetworkdiagramrepresentsanextendedserviceset(ESS).B.网络描述了一个extendedservicesetC.Accesspointsineachcellmustbeconfiguredtousechannel1.C.再每个CELL中的AP必须被配置成使用channel1D.Theareaofoverlapmustbelessthan10%oftheareatoensureconnectivity.D.为了确保连通性,重叠区域必须小于10%E.ThetwoAPsshouldbeconfiguredtooperateondifferentchannels.E.两个访问点应该被配置成工作在不同的频道Answer:BE6.Thecommandframe-relaymapip102broadcastwasenteredontherouter.Whichofthefollowingstatementsistrueconcerningthiscommand?6.路由器上输入命令frame-relaymapip102broadcast，以下选项正确的是?A.Thiscommandshouldbeexecutedfromtheglobalconfigurationmode.A.该命令应该在全局配置模式下被执行B.TheIPaddressisthelocalrouterportusedtoforwarddata.B.IP地址是本地路由器用来转发数据的接口C.102istheremoteDLCIthatwillreceivetheinformation.C.102是远端的DLCI它将接受信息。D.ThiscommandisrequiredforallFrameRelayconfigurations.D.这个命令要求被配置为所有的帧中继配置。E.Thebroadcastoptionallowspackets,suchasRIPupdates,tobeforwardedacrossthePVC.E.这个广播选项允许数据包，例如rip更新信息，将会被转发通过PVC.Answer:E7.WhichtypeofattackischaracterizedbyafloodofpacketsthatarerequestingaTCPconnectiontoaserver?7.哪种类型的攻击的特点是发大量的TCP请求连接数据包到服务器?A.denialofserviceA.拒绝服务B.bruteforceB.强制叠加C.reconnaissanceC.监听D.TrojanhorseD.木马Answer:A8.WhichofthefollowingareassociatedwiththeapplicationlayeroftheOSImodel?(Choosetwo.)8.以下两个选项是工作在OSI模型的应用层的?A.pingB.TelnetC.FTPD.TCPE.IPAnswer:BC9.Refertotheexhibit.ThenetworkadministratorhascreatedanewVLANonSwitch1andaddedhostCandhostD.TheadministratorhasproperlyconfiguredswitchinterfacesFastEthernet0/13throughFastEthernet0/24tobemembersofthenewVLAN.However,afterthenetworkadministratorcompletedtheconfiguration,hostAcouldcommunicatewithhostB,buthostAcouldnotcommunicatewithhostCorhostD.Whichcommandsarerequiredtoresolvethisproblem?9.网络管理员在交换机1上创建一个新VLAN并且将主机C和主机D加入到此VLAN中.管理员配置交换机接口FastEthernet0/13到FastEthernet0/24成为新VLAN成员.但是网络管理员完成配置以后,主机A可以和主机B通信,但是主机A不能和主机C或者主机D通信.哪个命令可以用来解决这个问题A.Router(config)#interfacefastethernet0/1.3Router(config-if)#encapsulationdot1q3Router(config-if)#ipaddressB.Router(config)#routerripRouter(config-router)#networkRouter(config-router)#networkRouter(config-router)#networkC.Switch1#vlandatabaseSwitch1(vlan)#vtpv2-modeSwitch1(vlan)#vtpdomainciscoSwitch1(vlan)#vtpserverD.Switch1(config)#interfacefastethernet0/1Switch1(config-if)#switchportmodetrunkSwitch1(config-if)#switchporttrunkencapsulationislAnswer:A10.Forsecurityreasons,thenetworkadministratorneedstopreventpingsintothecorporatenetworksfromhostsoutsidetheinternetwork.Whichprotocolshouldbeblockedwithaccesscontrollists?10.出于安全考虑，网络管理员需要去防止外网主机PING内网，下面那个协议应该用accesscontrollists限制掉A.IPB.ICMPC.TCPD.UDPAnswer:B11.Whataretworecommendedwaysofprotectingnetworkdeviceconfigurationfilesfromoutsidenetworksecuritythreats?(Choosetwo.)11.哪两种方法被推荐用来保守网络设备的配置文件不受外网的威胁A.AllowunrestrictedaccesstotheconsoleorVTYports.A.允许unrestricted访问到console或VTY口B.Useafirewalltorestrictaccessfromtheoutsidetothenetworkdevices.B.用防火墙去限制外网的网络设备访问C.AlwaysuseTelnettoaccessthedevicecommandlinebecauseitsdataisautomaticallyencrypted.C.因为数据被自动加密，所以总是允许使用TELNET命令访问网络设备的命令行，D.UseSSHoranotherencryptedandauthenticatedtransporttoaccessdeviceconfigurations.D.使用SSH或其他加密、认证机制去访问设备的配置E.Preventthelossofpasswordsbydisablingpasswordencryption.E.为了避免丢失密码，所以不对密码进行加密(明文)Answer:BD12.Refertotheexhibit.TheaccesslisthasbeenconfiguredontheS0/0interfaceofrouterRTBintheoutbounddirection.Whichtwopackets,ifroutedtotheinterface,willbedenied?(Choosetwo.)12.根据下图，该accesslist被配置在路由器RTB的S0/0接口上的OUT方向，哪两个数据包会被DENY，如果被路由到该接口上的话?access-list101denytcp25anyeqtelnetaccess-list101permitipanyanyA.sourceipaddress:;destinationport:21B.sourceipaddress:,7destinationport:21C.sourceipaddress:,1destinationport:21D.sourceipaddress:,6destinationport:23E.sourceipaddress:6;destinationport:23F.sourceipaddress:,9destinationport:23Answer:DE13.Whataretwosecurityappliancesthatcanbeinstalledinanetwork?(Choosetwo.)13.以下哪两个安全工具能被安装在一个网络里A.ATMB.IDSC.IOSD.IOXE.IPSF.SDMAnswer:BE14.Refertotheexhibit.Switch1hasjustbeenrestartedandhaspassedthePOSTroutine.HostAsendsitsinitialframetoHostC.Whatisthefirstthingtheswitchwilldoasregardspopulatingtheswitchingtable?14.根据下图，Switch1刚刚完成重启，并完成上电自检。HostA发送它的第一个侦到HostC，交换机首先会对switchingtable做什么操作A.Switch1willaddtotheswitchingtable.A.Switch1会添加到switchingtable.B.Switch1willadd2totheswitchingtable.B.Switch1添加2到switchingtable.C.Switch1willadd000A.8A47.E612totheswitchingtable.C.Switch1添加000A.8A47.E612到switchingtable.D.Switch1willadd000B.DB95.2EE9totheswitchingtable.D.Switch1添加000B.DB95.2EE9到switchingtable.Answer:C15.TheuserofHost1wantstopingtheDSLmodem/routerat54.BasedontheHost1ARPtablethatisshownintheexhibit,whatwillHost1do?15.Host1的用户想PINGDSL调制解调器/路由器的54，ARP表如下图，Host1会怎么操作?A.sendaunicastARPpackettotheDSLmodem/routerA.发送一个单播ARP包到DSL调制解调器/路由器B.sendunicastICMPpacketstotheDSLmodem/routerB.发送一个单播ICMP包到DSL调制解调器/路由器C.sendLayer3broadcastpacketstowhichtheDSLmodem/routerrespondsC.发送三层广播包到响应的DSL调制解调器/路由器D.sendaLayer2broadcastthatisreceivedbyHost2,theswitch,andtheDSLmodem/routerD.发送一个可以被Host2,theswitch,andtheDSLmodem/router受到的2层广播帧Answer:B16.Refertotheexhibit.WhatisthemostefficientsummarizationthatR1canusetoadvertiseitsnetworkstoR2?16.根据下图，R1能通告给R2的最有效的汇总是?A./22B./21C./22D./24/24/24/24E./2528/25/24/24/24Answer:C17.Whichspreadspectrumtechnologydoesthe802.11bstandarddefineforoperation?17.哪种扩频技术是802.11B定义使用的A.IRB.DSSSC.FHSSD.DSSSandFHSSE.IR,FHSS,andDSSSAnswer:B18.Refertotheexhibit.Assumethatallrouterinterfacesareoperationalandcorrectlyconfigured.Inaddition,assumethatOSPFhasbeencorrectlyconfiguredonrouterR2.HowwillthedefaultrouteconfiguredonR1affecttheoperationofR2?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配置正确，配置在R1上默认路由会怎么影响R2的工作A.AnypacketdestinedforanetworkthatisnotdirectlyconnectedtorouterR1willbedropped.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.AnypacketdestinedforanetworkthatisnotdirectlyconnectedtorouterR2willbedroppedimmediately.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.AnypacketdestinedforanetworkthatisnotdirectlyconnectedtorouterR2willbedroppedimmediatelybecauseofthelackofagatewayonR1.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.ThenetworksdirectlyconnectedtorouterR2willnotbeabletocommunicatewiththe,28,and4subnetworks.D.直连在R2上的网络将不能够和,28,4这些子网通讯E.AnypacketdestinedforanetworkthatisnotreferencedintheroutingtableofrouterR2willbedirectedtoR1.R1willthensendthatpacketbacktoR2andaroutingloopwilloccur.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.Anetworkinterfaceporthascollisiondetectionandcarriersensingenabledonasharedtwistedpairnetwork.Fromthisstatement,whatisknownaboutthenetworkinterfaceport?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.Thisisa10Mb/sswitchport.A.这是一个10Mb/s的交换端口B.Thisisa100Mb/sswitchport.B.这是一个100Mb/s的交换端口C.ThisisanEthernetportoperatingathalfduplex.C.这是一个工作在半双工模式下的以太口D.ThisisanEthernetportoperatingatfullduplex.D.这是一个工作在全双工模式下的以太口E.ThisisaportonanetworkinterfacecardinaPC.E.这是一个PC机上网卡上的一个接口Answer:C20.Refertothetopologyandrouterconfigurationshowninthegraphic.AhostontheLANisaccessinganFTPserveracrosstheInternet.Whichofthefollowingaddressescouldappearasasourceaddressforthepacketsforwardedbytheroutertothedestinationserver?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INTERNET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A.B.C.3D.7E.7F.8Answer:D21.AcompanyisinstallingIPphones.Thephonesandofficecomputersconnecttothesamedevice.Toensuremaximumthroughputforthephonedata,thecompanyneedstomakesurethatthephonetrafficisonadifferentnetworkfromthatoftheofficecomputerdatatraffic.Whatisthebestnetworkdevicetowhichtodirectlyconnectthephonesandcomputers,andwhattechnologyshouldbeimplementedonthisdevice?(Choosetwo.)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A.hubB.routerC.switchD.STPE.subinterfacesF.VLANAnswer:CF22.Refertotheexhibit.WhichstatementdescribesDLCI17?22.根据下图，那个选项描述了DLCI17A.DLCI17describestheISDNcircuitbetweenR2andR3.A.DLCI17描述了R2和R3之间的ISDN线路B.DLCI17describesaPVConR2.ItcannotbeusedonR3orR1.B.DLCI17描述了一条在R2上的PVC，不能用在R3和R1上C.DLCI17istheLayer2addressusedbyR2todescribeaPVCtoR3.C.DLCI17是R2使用的二层地址，用来描述一条到R3的PVCD.DLCI17describesthedial-upcircuitfromR2andR3totheserviceproviderD.DlDLCI17描述了一条从R2R3到服务提供商拨号网络Answer:C23.Whichroutingprotocolbydefaultusesbandwidthanddelayasmetrics?23.哪个路由协议默认用带宽和延迟作为metrics值A.RIPB.BGPC.OSPFD.EIGRPAnswer:D24.Refertotheoutputfromtheshowrunning-configcommandintheexhibit.WhatshouldtheadministratordotoallowtheworkstationsconnectedtotheFastEthernet0/0interfacetoobtainanIPaddress?24.根据下图中展示的showrunning-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FastEthernet0/0接口去获得一个IP地址A.Applyaccess-group14tointerfaceFastEthernet0/0.A.在接口FastEthernet0/0应用access-group14B.Addaccess-list14permitanyanytotheaccesslistconfiguration.B.在access-list14中添加access-list14permitanyanyC.ConfiguretheIPaddressoftheFastEtherent0/0interfaceto.C.配置FastEtherent0/0接口的IP地址为D.AddaninterfacedescriptiontotheFastEthernet0/0interfaceconfiguration.D.为接口FastEthernet0/0添加一个接口描述Answer:C25.Refertotheexhibit.ThenetworksconnectedtorouterR2havebeensummarizedasa/21routeandsenttoR1.WhichtwopacketdestinationaddresseswillR1forwardtoR2?(Choosetwo.)25.根据下图，网络连接到路由器R2被汇总为一条/21的路由，并发给R1。哪两个数据包目的地址R1会转发给R2A.60B.1C.D.55E.F.5Answer:BE26.TworoutersnamedAtlantaandBrevardareconnectedbytheirserialinterfacesasshownintheexhibit,butthereisnodataconnectivitybetweenthem.TheAtlantarouterisknowntohaveacorrectconfiguration.Giventhepartialconfigurationsshownintheexhibit,whatistheproblemontheBrevardrouterthatiscausingthelackofconnectivity?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上导致该问题的原因是A.Aloopbackisnotset.A.没有设置loopback命令B.TheIPaddressisincorrect.B.IP地址不正确C.Thesubnetmaskisincorrect.C.子网掩码不正确D.Theseriallineencapsulationsareincompatible.D.串行链路封装不正确E.Themaximumtransmissionunit(MTU)sizeistoolarge.E.最大传输单元(MTU)设置得太大F.Thebandwidthsettingisincompatiblewiththeconnectedinterface.F.带宽设置和直连的接口不匹配Answer:B27.Refertotheexhibit.Whichswitchprovidesthespanning-treedesignatedportroleforthenetworksegmentthatservicestheprinters?27.根据下图，哪个交换机为打印机提供了生成树中的指定端口角色?A.Switch1B.Switch2C.Switch3D.Switch4Answer:C28.Refertotheexhibit.Switch-1needstosenddatatoahostwithaMACaddressof00b0.d056.efa4.Whatwilldowiththisdata?28.根据下图，Switch-1需要往一台MAC地址为00b0.d056.efa4的主机发数据，Switch-1会如何处理这些数据?A.Switch-1willdropthedatabecauseitdoesnothaveanentryforthatMACaddress.A.Switch-1会丢弃该数据，因为它没有该MAC地址条目B.Switch-1willfloodthedataoutallofitsportsexcepttheportfromwhichthedataoriginated.B.Switch-1会防洪该数据到所有的接口，除了该数据的源接口C.Switch-1willsendanARPrequestoutallitsportsexcepttheportfromwhichthedataoriginated.C.Switch-1会发送ARP请求到所有的接口，除了该数据的源接口D.Switch-1willforwardthedatatoitsdefaultgateway.D.Switch-1会往默认网关发送该数据Answer:B29.IntheimplementationofVLSMtechniquesonanetworkusingasingleClassCIPaddress,whichsubnetmaskisthemostefficientforpoint-to-pointseriallinks?29.在使用VLSM技术的网络中使用一个C类的IP地址，以下哪个子网掩码在点对点串行链路中是最不浪费地址空间的?A.B.40C.48D.52E.54Answer:D30.Refertotheexhibit.WhywouldthenetworkadministratorconfigureRAinthismanner?30.根据下图，网络管理员如此配置的RA的原因是?A.togivestudentsaccesstotheInternetA.让students访问InternetB.topreventstudentsfromaccessingthecommandpromptofRAB.阻止students访问RA的命令提示符C.topreventadministratorsfromaccessingtheconsoleofRAC.阻止管理员访问RA的控制台D.togiveadministratorsaccesstotheInternetD.让administrators访问InternetE.topreventstudentsfromaccessingtheInternetE.阻止students访问InternetF.topreventstudentsfromaccessingthenetworkF.阻止students访问Admin的网络Answer:B31.WhichtwovaluesareusedbySpanningTreeProtocoltoelectarootbridge?(Choosetwo.)31.那两个值被生成树协议用来选举根桥A.amountofRAMB.bridgepriorityC.IOSversionD.IPaddressE.MACaddressF.speedofthelinksAnswer:BE32.根据下图，图中两个设备是网络中仅有的CISCO设备，两个设备间的串行链路的掩码52,在下面的答案中，哪三个是正确的?A.TheManchesterserialaddressis.A.Manchester的串行链路的地址为B.TheManchesterserialaddressis.B.Manchester的串行链路的地址为C.TheLondonrouterisaCisco2610.C.London路由器是CISCO2610D.TheManchesterrouterisaCisco2610.D.London路由器是CISCO2610E.TheCDPinformationwasreceivedonportSerial0/0oftheManchesterrouter.E.路由器Manchester的Serial0/0端口收到CDP信息F.TheCDPinformationwassentbyportSerial0/0oftheLondonrouter.F.路由器London的Serial0/0端口收到CDP信息Answer:ACE33.Whiletroubleshootinganetworkconnectivityproblem,atechnicianobservessteadylinklightsonboththeworkstationNICandtheswitchporttowhichtheworkstationisconnected.However,whenthepingcommandisissuedfromtheworkstation,theoutputmessage"Requesttimedout."isdisplayed.AtwhichlayeroftheOSImodeldoestheproblemmostlikelyexist?33.在进行网络连接排错的时候,一种技术员注意到工作站网卡和交换机连接工作站的接口的灯常亮.当在工作站使用PING命令的时候,出现的信息是"Requesttimedout"那OSI最有可能存在问题A.thesessionlayerA.会话层B.theprotocollayerB.协议层C.thedatalinklayerC.数据链路层D.theaccesslayerD.访问层E.thenetworklayerE.网络层F.theapplicationlayerF.应用层Answer:E34.Anetworkadministratorhasconfiguredtwoswitches,namedLondonandMadrid,touseVTP.However,theswitchesarenotsharingVTPmessages.Giventhecommandoutputshowninthegraphic,whyaretheseswitchesnotsharingVTPmessages?34.一个网络管理员配置了两台交换机London和Madrid，让它们使用VTP。但是，两台交换机之间没有共享VTP信息，根据下图，回答交换机之间没有分享VTP信息的原因A.TheVTPversionisnotcorrectlyconfigured.A.VTP版本配置错误B.TheVTPoperatingmodeisnotcorrectlyconfigured.B.VTP工作模式配置错误C.TheVTPdomainnameisnotcorrectlyconfigured.C.VTP域名配置错误D.VTPpruningmodeisdisabled.D.VTP的pruningmode被禁止了E.VTPV2modeisdisabled.E.VTP的V2mode被禁止了F.VTPtrapsgenerationisdisabled.F.VTPtrapsgeneration被禁止了Answer:C35.InordertoallowtheestablishmentofaTelnetsessionwitharouter,whichsetofcommandsmustbeconfigured?35.为了允许建立一个TELNET会话，以下那个命令集必须被配置?A.router(config)#lineconsole0router(config-line)#enablepasswordciscoB.router(config)#lineconsole0router(config-line)#enablesecretciscorouter(config-line)#loginC.router(config)#lineconsole0router(config-line)#passwordciscorouter(config-line)#loginD.router(config)#linevty0router(config-line)#enablepasswordciscoE.router(config)#linevty0router(config-line)#enablesecretciscorouter(config-line)#loginF.router(config)#linevty0router(config-line)#passwordciscorouter(config-line)#loginAnswer:F36.Host1istryingtocommunicatewithHost2.Thee0interfaceonRouterCisdown.Whichofthefollowingaretrue?(Choosetwo.)36.Host1正在试图和Host2联系。RouterC的e0接口是down的，以下选项正确的是?A.RouterCwilluseICMPtoinformHost1thatHost2cannotbereached.A.RouterC会使用ICMP通知Host1“Host2无法到达”B.RouterCwilluseICMPtoinformRouterBthatHost2cannotbereached.B.RouterC会使用ICMP通知Host1“Host2无法到达”C.RouterCwilluseICMPtoinformHost1,RouterA,andRouterBthatHost2cannotbereached.C.RouterC会使用ICMP通知Host1，RouterA和RouterB“Host2无法到达”D.RouterCwillsendaDestinationUnreachablemessagetype.D.RouterC会发送一个“DestinationUnreachable”的消息类型E.RouterCwillsendaRouterSelectionmessagetype.E.RouterC会发送一个“RouterSelection”的消息类型F.RouterCwillsendaSourceQuenchmessagetype.F.RouterC会发送一个“SourceQuench”的消息类型Answer:AD37.Refertotheexhibit.Assumingthattherouterisconfiguredwiththedefaultsettings,whattypeofrouterinterfaceisthis?37.根据下图，假设路由器已经配置了默认配置，那么这个接口是：A.EthernetB.FastEthernetC.GigabitEthernetD.asynchronousserialE.synchronousserialAnswer:B38.Onpoint-to-pointnetworks,OSPFhellopacketsareaddressedtowhichaddress?38.在OSPF点到点链路中，Hello包是发往以下那个地址?A.B.C.D.E.F.55Answer:E39.Whiletroubleshootingaconnectivityproblem,anetworkadministratornoticesthataportstatusLEDonaCiscoCatalystseriesswitchisalternatinggreenandamber.Whichconditioncouldthisindicate?39.一位网络管理员在进行链路连通性检查时，发现CiscoCatalyst系列交换机上的LED灯，在绿色和琥珀色之间不停变化。以上现象是因为()A.Theportisexperiencingerrors.A.这个端口存在问题B.Theportisadministrativelydisabled.B.这个端口被管理性的禁止。C.Theportisblockedbyspanningtree.C.这个端口被生成树协议阻塞D.Theporthasanactivelinkwithnormaltrafficactivity.D.这个端口的活动链路上有流量。Answer:A40.Refertotheexhibit.ThenetworkshownintheexhibitisrunningtheRIPv2routingprotocol.Thenetworkhasconverged,andtheroutersinthisnetworkarefunctioningproperly.TheFastEthernet0/0interfaceonR1goesdown.Inwhichtwowayswilltheroutersinthisnetworkrespondtothischange?(Choosetwo.)40.图中所示网络运行RIPV2路由选择协议，全网收敛并且所有的路由器运行正常。现在R1的FastEthernet0/0端口，不能正常工作了，则网段内的路由器会作出怎样的回应?A.Allrouterswillreferencetheirtopologydatabasetodetermineifanybackuproutestothenetworkareknown.A.所有的路由器会参照自己的拓扑数据库，看它们是否有到的备份路由。B.RoutersR2andR3marktherouteasinac