ccna正版题库v20加强版选择题

QUESTIONRefertotheexhibit.WhatwillRouter1dowhenitreceivesthedataframeshown?(ChooseRouter1willstripoffthesourceMACaddressandreceitwiththeMACaddressRouter1willstripoffthesourceIPaddressandreceitwiththeIPaddressRouter1willstripoffthedestinationMACaddressandreceitwiththeMACaddressRouter1willstripoffthedestinationIPaddressandreceitwiththeIPaddressofRouter1willforwardthedatapacketoutinterfaceRouter1willforwardthedatapacketoutinterfaceCorrectAnswer:Section:OperationofIPDataNetwroks -攻城狮QUESTIONRefertotheexhibit.WhichthreestatementscorrectlydescribeNetworkDeviceA?(ChooseWithanetworkwidemaskof28,eachinterfacedoesnotrequireanIPWithanetworkwidemaskof28,eachinterfacedoesrequireanIPaddressonauniqueIPsubnet.Withanetworkwidemaskof,mustbeaLayer2deviceforthePCstocommunicatewitheachother.Withanetworkwidemaskof,mustbeaLayer3deviceforthePCstocommunicatewitheachother.Withanetworkwidemaskof,eachinterfacedoesnotrequireanIPCorrectAnswer:Section:OperationofIPDataNetwroks 更新/讲解/免费答疑: QUESTIONWhichlayerintheOSIreferencemodelisresponsiblefordeterminingtheavailabilityofthereceivingprogramandcheckingtoseeifenoughresourcesexistforthatcommunication?CorrectAnswer:Section:OperationofIPDataNetwroks 更新/讲解/免费答疑: QUESTIONWhichofthefollowingdescribestherolesofdevicesinaWAN?(ChooseACSU/DSUterminatesadigitallocalAmodemterminatesadigitallocalACSU/DSUterminatesanoglocalAmodemterminates oglocalArouteriscommonlyconsideredaDTEArouteriscommonlyconsideredaDCECorrectAnswer:ADESection:WAN 更新/讲解/免费答疑: QUESTIONRefertotheexhibit,HostAsinterfaceS0/0onrouter3,whatistheTTLvalueforthatCorrectAnswer:Section:OperationofIPDataNetwroks 更新/讲解/免费答疑: QUESTIONAnetworkadministratorisverifyingtheconfigurationofanewlyinstalledhostbyestablishinganFTPconnectiontoaremoteserver.Whatisthehighestlayeroftheprotocolstackthatthenetworkadministratorisusingforthisoperation?dataCorrectAnswer:Section:OperationofIPDataNetwroks 更新/讲解/免费答疑:ht QUESTIONRefertotheexhibit.AfterHostAsHostB,whichentrywillbeintheARPcacheofHostAtosupportthisCorrectAnswer:Section:OperationofIPDataNetwroks 更新/讲解/免费答疑: 问：当主机A主机B之后，下面那个ARP缓存条目会支持此次通讯考题分析：这道题考的是局域网ARP的请求。HostA要HostB，首先HostA需要封装包，而封装包需要HostA和HostB的二、三层地址的信息。然而HostA不知道HostB的二层地址，这样HostA就会向局域网发送Arp请求，来请求HostB的二层地址。网关收到HostA的Arp请求后，发现HostB是其他网段的地址，这样网关会启用Arp的功能，将自己的二层地址应答给HostA。HostA收到应答包后会对本地的ARP缓存进行更新，将应答方的IP和MAC地址在ARP缓存中，同时完成包的封装。网关在收到攻城狮QUESTIONAnetworkinterfaceporthascollisiondetectionandcarriersensingenabledonasharedtwistedpairnetwork.Fromthisstatement,whatisknownaboutthenetworkinterfaceport?Thisisa10Mb/sswitchThisisa100MbsswitchThisisanEthernetportoperatingathalfThisisanEthernetportoperatingatfullThisisaportonanetworkinterfacecardinaCorrectAnswer:Section:OperationofIPDataNetwroks 更新/讲解/免费答疑: QUESTIONAreceivinghostcomputesthechecksumonaframeanddeterminesthattheframeisdamaged.Theframeisthendiscarded.AtwhichOSIlayerdidthishappen?dataCorrectAnswer:Section:OperationofIPDataNetwroks 更新/讲解/免费答疑: QUESTIONWhichofthefollowingcorrectlydescribestepsintheOSIdataencapsulationprocess?(ChooseThetransportlayerdividesadatastreamintosegmentsandmayaddreliabilityandflowcontrolThedatalinklayeraddsphysicalsourceanddestinationaddressesandanFCStothePacketsarecreatedwhenthenetworklayerencapsulatesaframewithsourceanddestinationhostaddressesandprotocol-relatedcontrolinformation.PacketsarecreatedwhenthenetworklayeraddsLayer3addressesandcontrolinformationtoaThepresentationlayertranslatesbitsintovoltagesfortransmissionacrossthephysicalCorrectAnswer:Section:OperationofIPDataNetwroks 更新/讲解/免费答疑: 传输层将数据分段，并且加入flowcontrol等信息。在网络层就将数据进行打包，并加上ip包头，链路层。将攻城狮QUESTIONRefertothegraphic.HostAiscommunicatingwiththeseiver.WhatwillbethesourceMACaddressoftheframesreceivedbyHostAfromtheserver?theMACaddressoftheservernetworktheMACaddressofhosttheMACaddressofrouterinterfaceetheMACaddressofrouterinterfaceCorrectAnswer:Section:OperationofIPDataNetwroks 更新/讲解/免费答疑:ht hostA收到server的帧的源mac地址是hostA的网关的mac。QUESTIONRefertotheexhibit.WhattworesultswouldoccurifthehubweretoberecedwithaswitchthatisconfiguredwithoneEthernetVLAN?(choosetwo)Thenumberof swouldThenumberof swouldThenumberof swouldremaintheThenumberof swouldremaintheThenumberof swouldCorrectAnswer:Section:OperationofIPDataNetwroks 更新/讲解/免费答疑: hub不可以域，所有端口同一个域中，交换机可以域，每个端口在不同域中，故换换机域个数会增加，大小会减小，而hub交换机都不可广播域所有端口都在同一个广播CD域数量不QUESTIONWhichthreestatements ydescribelayer2Ethernetswitches?(chooseMicrosegmentationdecreasesthenumberofcollisionsontheifaswitchreceivesaframeforanunknowndestination,itusesARPtoresolvetheSpanningTreeProtocolallowsswitchestoautomaticallysharevlanInaproperlyfunctioningnetworkwithredundantswitchedpaths,eachswitchedaegmentwillcontainonerootbridgewithallitsportsintheforwardingstate.Allotherswitchesinthatbroadcast haveonlyonerootport.Establishingvlansincreasesthenumberof Switchesthatareconfiguredwithvlansmakeforwardingdecisionsbasedonbothlayer2andlayer3addressinformation.CorrectAnswer:Section:OperationofIPDataNetwroks 更新/讲解/免费答疑: QUESTIONWheredoesroutingoccurwithintheDoDTCP/IPreferenceCorrectAnswer:Section:OperationofIPDataNetwroks 更新/讲解/免费答疑: QUESTIONWhichdestinationaddresseswillbeusedbyHostAtosenddatatoHostC?(ChoosetheIPaddressofSwitchtheMACaddressofSwitchtheIPaddressofHosttheMACaddressofHosttheIPaddressoftherouter'sE0theMACaddressoftherouter'sE0CorrectAnswer:Section:OperationofIPDataNetwroks 更新/讲解/免费答疑: QUESTIONForwhattwopurposesdoestheEthernetprotocolusephysicaladdresses?(ChoosetouniquelyidentifydevicesatLayertoallowcommunicationwithdevicesonadifferenttodifferentiateaLayer2framefromaLayer3toestablishaprioritysystemtodeterminewhichdevicegetstotransmittoallowcommunicationbetweendifferentdevicesonthesametoallowdetectionofaremotedevicewhenitsphysicaladdressisCorrectAnswer:Section:OperationofIPDataNetwroks 更新/讲解/免费答疑: A：在二层唯一确定一台设备，正 攻城狮QUESTIONRefertotheexhibit.Basedontheinformationgiven.WhichswitchwillbeelectedrootbridgeandSwitchA,becauseithasthelowestMACSwitchC,becauseithasthelowestSwitchB,becauseithasthehighestMACSwitchC,becauseitisthemostcentrallylocatedSwitchA,becauseitisthemostcentrallylocatedSwitchD,becauseithasthehighestCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONWhatvalueisprimarilyusedtodeterminewhichport estherootportoneachnonrootswitchinaspanning-treetopology?lowestportMACportprioritynumberandMACVTPrevisionhighestportprioritypathCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONRefertotheexhibit.Switch-1needstosenddatatoahostwithaMACaddressof00b0.d056.efa4.WhatwillSwitch-1dowiththisdata?switch-1willdropthedatabecauseitdoesnothaveanentryforthatMACswitch-1willfloodthedataoutallofitsportfromwhichthedataswitch-1willforwardthedatatoitsdefaultswitch-1willsendanARPrequestoutallitsportsexcepttheportfromwhichthedataCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: 答案：B没有macSwitch-1willdropthedatabecauseitdoesnothaveanentryforthatMACaddress.(Switch-1会丢弃该Switch-1willfloodthedataoutallofitsportsexcepttheportfromwhichthedataoriginated.(Switch-1会Switch-1willsendanARPrequestoutallitsportsexcepttheportfromwhichthedataoriginated.Switch-1willforwardthedatatoitsdefaultgateway.(Switch-1会往默认网关发送该数据QUESTIONWhatisthefunctionofthecommandswitchporttrunknativevlan999onaItdesignatesVLAN999foruntaggedItblocksVLAN999trafficfrompassingontheItcreatesaVLAN999ItdesignatesVLAN999asthedefaultforallunknowntaggedCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONWhichtwoprotocolsareusedbybridgesand/orswitchestopreventloopsinalayer2network?(ChooseCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONWhichswitchwouldSTPchoose etherootbridgeintheselectionCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑:ht QUESTIONAswitchisconfiguredwithallportsassignedtovlan2withfullduplexFastEthernettosegmentexistingdepartmentaltraffic.WhatistheeffectofaddingswitchportstoanewVLANontheswitch?More swillbeIPaddressutilizationwillbemoreMorebandwidthwillberequiredthanwasneededAnadditional willbeCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: vlan有广播域的作QUESTIONWhatarethreebenefitsofimplementingvlans?(chooseAmoreefficientuseofbandwidthcanbeachievedallowingmanyphysicalgroupstousethesamenetworkinfrastructureBroadcaststormscanbemitigatedbydecreasingthenumberofbroadcast s,thusincreasingtheirsize.Ahigherlevelofnetworksecuritycanbereachedbyseparatingsensitivedatatrafficfromothernetworktraffic.Port-basedvlansincreaseswitch-portuseefficient,thanksto802.1QAmoreefficientuseofbandwidthcanbeachievedallowingmanylogicalnetworkstousethesamenetworkinfrastructure.Broadcaststormscanbemitigatedbyincreasingthenumberofbroadcast s,thusreducingtheirVLANsmakeiteasierforITstafftoconfigurenewlogicalgroups,becausethevlansallbelongtothesamebroadcast CorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: Dthanksto802.1Qtrunks不正确E正确，logical是逻辑的意思攻城狮QUESTIONWhichIEEEstandardprotocolisinitiatedasaresultofsuccessfulDTPcompletioninaswitchoverCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: 动态中继协议DTP，是VLAN组中思科的私有协议，主要用于协商两台设备间链的中继过程及中继封装802.1Q类型。QUESTIONWhichofthefollowingarebenefitsofVLANs?(ChooseTheyincreasethesizeof TheyallowlogicalgrouofusersbyTheycanenhancenetworkTheyincreasethesizeof swhiledecreasingthenumberof Theyincreasethenumberof swhiledecreasingthesizeofthe TheysimplifyswitchCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: 考查VLAN的特点A：增加域的大小，错误B： 减少广播域的大小时增加了广播域个数。正确。F：攻城狮QUESTIONRefertotheexhibit.AtechnicianhasinstalledSwithchBandneedstoconfigureitforremoteaccessfromthemanagementworkstationconnectedSwitchAWhichsetofcommandsisrequiredto plishthisSwitchB(config)#interfaceFastEthernet0/1SwitchB(config)#ipaddress52SwitchB(config)#noshutdownSwitchB(config)#interfacevlan1SwitchB(config)#ipaddress52SwitchB(config)#noshutdownSwitchB(config)#interfacevlanSwitchB(config)#ipaddress52SwitchB(config)#interfacevlan1SwitchB(config)#ipaddress52SwitchB(config)#noshutdownCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: BQUESTIONInanEthernetnetwork,underwhattwoscenarioscandevicestransmit?(ChoosewhentheyreceiveaspecialwhenthereisawhentheydetectnootherdevicesarewhenthemediumiswhentheservergrantsCorrectAnswer:Section:OperationofIPData 更新/讲解/免费答疑: 攻城狮QUESTIONWhichtwostatesaretheportstateswhenRSTPhasconverged?(chooseCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONWhichtwocommandscanbeusedtoverifyatrunklinkconfigurationstatusonagivenciscoswitch?(choosetwo)showinterfacesshowinterfacesshowinterfacesshowipinterfaceshowinterfacesCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: 查看trunk命令，showinterfacetrunk和showinterface，只能选QUESTIONWhichcommandenablesRSTPonaspanning-treemoderapid-spanning-treespanning-treespanning-treemodeCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: 启用RSTPQUESTIONWhichofthefollowingstatementsdescribethenetworkshowninthegraphic?(ChooseTherearetwo sintheTherearefour sintheTherearesix sintheTherearefour sintheTherearefive sintheThereareseven sintheCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONRefertotheAllswitchportsareassignedtothecorrectVLANs,butnoneofthehostsconnectedtoSwitchAcancommunicatewithhostsinthesameVLANconnectedtoSwitchB.Basedontheoutputshown,whatisthemostlikelyproblem?TheaccesslinkneedstobeconfiguredinmultipleThelinkbetweentheswitchesisconfiguredinthewrongThelinkbetweentheswitchesneedstobeconfiguredasaVTPisnotconfiguredtocarryVLANinformationbetweentheSwitchIPaddressesmustbeconfiguredinorderfortraffictobeforwardedbetweentheCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONRefertotheexhibit.GiventheoutputshownfromthisCiscoCatalyst2950,whatisthemostlikelyreasonthatinterfaceFastEthernet0/10isnottherootportforVLAN2?ThisswitchhasmorethanoneinterfaceconnectedtotherootnetworksegmentinVLANThisswitchisrunningRSTPwhiletheelecteddesignatedswitchisrunning802.1dSpanningThisswitchinterfacehasahigherpathcosttotherootbridgethananotherintheThisswitchhasalowerbridgeIDforVLAN2thantheelecteddesignatedCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: 攻城狮QUESTIONWhywillaswitchneverlearnabroadcastBroadcastframesareneversenttoBroadcastaddressesuseanincorrectformatfortheswitchingAbroadcastaddresswillneverbethesourceaddressofaBroadcastsonlyusenetworklayerAbroadcastframeisneverforwardedbyaCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONRefertotheexhibit.WhyhasthisswitchnotbeenelectedtherootbridgeforIthasmorethanoneinterfacethatisconnectedtotherootnetworkItisrunningRSTPwhiletheelectedrootbridgeisrunning802.1dspanningIthasahigherMACaddressthantheelectedrootIthasahigherbridgeIDthantheelectedrootCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: B：使用了RSTP，但是根桥时使用了802.1d，错误 QUESTIONWhichtwolinkprotocolsareusedtocarrymultipleVLANsoverasinglelink?(ChooseCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONassumingthedefaultswitchconfigurationwhichvlanrangecanbeaddedmodifiedandremovedonaciscoswitch?2through1through1through2throughCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONWhichstatementaboutvlanoperationonciscocatalystswitchesiswhenapacketisreceivedfroman802.1Qtrunk,thevlanidcanbedeterminedfromthesourceMACaddresstable.unkownunicastframesareretransmittedonlytotheportsthatbelongtothesameportsbetweenswitchesshouldbeconfiguredinaccessmodesothatvlanscanspanacrossportsbroadcastandmulticastframesareretransmittedtoportsthatareconfiguredondifferentCorrectAnswer:Section:WAN 更新/讲解/免费答疑: Dvlan能分割广播域，广播不能跨vlanQUESTIONRefertothetopologyshownintheexhibit.WhichportswillbeSTPdesignatedportsifallthelinksareoperatingatthesamebandwidth?(Choosethree.)SwitchA-SwitchA-SwitchB-SwitchB-SwitchC-SwitchC-CorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONRefertotheexhibit.HowshouldtheFastEthernet0/1portonthe2950modelswitchesthatareshownintheexhibitbeconfiguredtoallowconnectivitybetweenalldevices?TheportsonlyneedtobeconnectedbyacrossoverSwitchX(config)#interfaceFastEthernet0/1SwitchX(config-if)#switchportmodetrunkSwitchX(config)#interfaceFastEthernet0/1SwitchX(config-if)#switchportmodeaccessSwitchX(config-if)#switchportaccessvlan1SwitchX(config)#interfaceFastEthernet0/1SwitchX(config-if)#switchportmodetrunkSwitchX(config-if)#switchporttrunkvlan1SwitchX(config-if)#switchporttrunkvlan10SwitchX(config-if)#switchporttrunkvlan20CorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONRefertotheexhibitAframeonvlan1onswitchs1issenttoswitchs2whentheframeisreceivedonvlan2,whatcausesthisbehavior?trunkmodevlansthatdonotcorrespondtoauniqueIPnativevlanallowingonlyvlan2ontheCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONWhichthreestatementsaboutRSTParetrue?(chooseRSTPsignificantlyreducestopologyreconvertingtimeafteralinkRSTPexpendstheSTPportrolesbyaddingthealternateandbackupRSTPalsousestheSTPproprsal-agreementRSTPusethesametimer-baseedprocessasSTPonpoint-to-pointRSTPprovidesafastertransitiontotheforwardingstateonpoint-to-pointlinksthanSTPCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONAtwhichlayeroftheOSImodelisRSTPusedtopreventdataCorrectAnswer:Section:OperationofIPDataNetwroks 更新/讲解/免费答疑: QUESTIONWhatdoesaLayer2switchusetodecidewheretoforwardareceivedsourceMACsourceIPsourceswitchdestinationIPdestinationportdestinationMACCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONRefertotheexhibit.WhichstatementisTheFa0/11roleconfirmsthatSwitchAistherootbridgeforVLANVLAN20isrunningthePerVLANSpanningTreeTheMACaddressoftherootbridgeisSwitchAisnottherootbridge,becausenotalloftheinterfacerolesareCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑:ht QUESTIONWhichtwobenefitsareprovidedbycreatingVLANs?(ChooseaddeddedicatedprovidesallowsswitchestoroutetrafficbetweencontainsCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONWhichcommandcanbeusedfromaPCtoverifytheconnectivitybetweenhoststhatconnectthroughaswitchinthesameLAN?addresstracerttraceroutearpCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONBasedonthenetworkshowninthegraphicwhichoptioncontainsthepotentialnetworkingproblemandprotocolorsettingthatcantopreventtheproblem?Routingloops,holddownSwitchingloops,splitRoutingloops,splitSwitchingloops,Routingloops,Switchingloops,CorrectAnswer:Section:LANSwitching QUESTIONRefertotheexhibit.WhichtwostatementsaretrueaboutinterVLANroutinginthetopologythatisshownintheexhibit?(Choosetwo.)HostEandhostFusethesameIPgatewayRouter1andSwitch2shouldbeconnectedviaacrossoverRouter1willnotyaroleincommunicationsbetweenhostAandhostTheFastEthernet0/0interfaceonRouter1mustbeconfiguredwithRouter1needsmoreLANinterfaces modatetheVLANsthatareshownintheTheFastEthernet0/0interfaceonRouter1andSwitch2trunkportsmustbeconfiguredusingthesameencapsulationtype.CorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: 数据流量的转发。如图，Route1不需要的Lan接口，它只需要在F0/0口上创建的子接口来完成对攻城狮QUESTIONWhichtwoofthesearecharacteristicsofthe802.1Qprotocol?(chooseitisalayer2messagingprotocolwhichmaintainsvlanconfigurationsacrossitincludesan8-bitfieldwhichspecifiesthepriorityofaitisusedexclusivelyfortaggingvlanframesanddosenotaddressnetworkreconvergencefollowingswitchednetworktopologychanges.itmodifiesthe802.3frameheader,andthusrequiresthattheFCS itisatrunkingprotocolcapableofcarringuntaggedCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑:ht QUESTIONRefertotheexhibit.Eachofthesefourswitcheshasbeenconfiguredwithahostname,aswellasbeingconfiguredtorunRSTP.Nootherconfigurationchangeshavebeenmade.WhichthreeoftheseshowthecorrectRSTPportrolesfortheindicatedswitchesandinterfaces?(Choosethree.)SwitchA,Fa0/2,SwitchA,Fa0/1,SwitchB,Gi0/2,SwitchB,Gi0/1,SwitchC,Fa0/2,SwitchD,Gi0/2,CorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: 判断非根桥上的跟端口。在同一个交换机上，到根网桥的cost较小的那个端口会成为rootport。所以SwitchAFa0/1，SwitchDGi0/2，SwitchBGi0/1会成为相应交换机上的RP3.判断每个网段上的指定端定端口。SWB--SWD段：SWB的G0/1端口cost为19+19=38，SWD的G0/1端口cost为19，所以SWD的(有不懂的地方可以加了解 QUESTIONRefertotheexhibit.ThenetworkadministratornormallyestablishesanetsessionwiththeswitchfromsattempttotheswitchfromhostBfails,butshostA.However,hostAisunavailable.Theadministratortotheothertwohostsaresuccessful.whatistheissue?HostBandtheswitchneedtobeinthesameTheswitchneedsandappropriatedefaultgatewayTheswitchinterfaceconnectedtotherouterisHostBneedtobeassignedanIPaddressinvlanTheswitchinterfacesneedtheappropriateIPaddressesCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: 管理交换机需要在交换机上设置defaultgateway和vlanQUESTIONRefertotheexhibit.Whatswitchprovesthespanning-treedesignatedportroleforthenetworksegmentthatservicestheprinters?CorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONWhatisonebenefitofPVST+reducestheCPUcyclesforalltheswitchesinthePVST+automaticallyselectstherootbridgelocation,toprovideoptimizedbandwidthPVST+allowtherootswitchlocationtobeoptimizedperPVST+supportsLayer3loadbalancingwithoutCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: 攻城狮QUESTIONWhicharevalidmodesforaswitchportusedasaVLANtrunk?(ChooseCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONHowmanybroadcast sareshowninthegraphicassumingonlythedefaultvlanisconfiguredontheswitches?CorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONWhichthreeofthesestatementsregarding802.1Qtrunkingarecorrect?(Choose802.1QnativeVLANframesareuntaggedby802.1Qtrunkingportscanalsobesecure802.1Qtrunkscanuse10Mb/sEthernet802.1Qtrunksrequirefull-duplex,point-to-point802.1QtrunksshouldhavenativeVLANsthatarethesameatbothCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑:ht 802.1qnativevlan是不做标记的，并且在trunk两边的native需要一致QUESTIONRefertotheexhibit.Theoutputthatisshownisgeneratedataswitch.Whichthreeofthesestatementsaretrue?(Choosethree.)Allportswillbeinastateofdiscarding,learning,orThiryVLANshavebeenconfiguredonthisThebridgepriorityislowerthanthedefaultvalueforspanningAllinterfacesthatareshownareonsharedAlldesignatedportsareinaforwardingTheswitchmustbetherootbridgeforallVLANsonthisCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONRefertotheexhibit.AttheendofanRSTPelectionprocess,whichaccesslayerswitchportwillassumethediscardingrole?Switch3,portSwitch3,portSwitch4,portSwitch4,portSwitch3,portSwitch3,portCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONWhichtermdescribesaspanning-treenetworkthathasallswitchportsineithertheblockingorforwardingCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONWhatarethepossibletrunkingmodesforaswitchport?(ChooseF.CorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: 考点：考查交换机在trunk模式下的模式auto： 成为trunk，也主动发DTP信息desirable：攻城狮QUESTIONWhichtwoofthesestatementsregardingRSTParecorrect?(ChooseRSTPcannotoperatewithRSTPdefinesnewportRSTPdefinesnonewportRSTPisaproprietaryimplementationofIEEE802.1DRSTPiscompatiblewiththeoriginalIEEE802.1DCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONRefertotheexhibit.Whichtwostatementsaretrueoftheinterfacesonswitch1?(chooseAhubisconnecteddirectlytoFastEthernet0/1isconfiguredasatrunkFastEthernet0/5hasstaticallyassignedmacInterfaceFastEthernet0/2hasbeenMultipledevicesareconnecteddirectlytoFastEthernet0/1isconnectedtoahostwithmultiplenetworkinterfaceCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONThreeswitchesareconnectedtooneantherviatrunkports.Assumingthedefaultswitchconfiguration,whichswitchiselectedastherootbridgeforthespanning-treeinstanceofvlan1?theswitchwiththelowestMACtheswitchwiththehighestMACtheswitchwitchthehighestIPtheswitchwiththelowestIPCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: 桥ID=桥优先级+桥macQUESTIONWhatarethreeadvantagesofVLANs?(ChooseVLANsestablish sinswitchedVLANsutilizepacketfilteringtoenhancenetworkVLANsprovideamethodofconservingIPaddressesinlargeVLANsprovidealow-latencyinternetworkingalternativetoroutedVLANsallowaccesstonetworkservicesbasedondepartment,notphysicalVLANscangreatlysimplifyadding,moving,orchanginghostsontheCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: E：vlan允许基于逻辑划分的网络，不是物理位置。正确。F：攻城狮QUESTIONWhichtwobenefitsareprovidedbyusingahierarchicaladdressingnetworkaddressingscheme?(Choosereducesroutingtableauto-negotiationofmediaefficientutilizationofMACdedicatedcommunicationsbetweeneaseofmanagementandCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONWhatisthealternativenotationfortheIPV6addressCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: QUESTIONRefertothediagram.Allhostshaveconnectivitywithoneanother.Whichstatementsdescribetheaddressingschemethatisinuseinthenetwork?(Choosethree.)ThesubnetmaskinuseisThesubnetmaskinuseisTheIPaddress5canbeassignedtohostsinTheIPaddress05canbeassignedtohostsinTheLANinterfaceoftherouterisconfiguredwithoneIPTheLANinterfaceoftherouterisconfiguredwithmultipleIPCorrectAnswer:Section:LANSwitching 更新/讲解/免费答疑: 攻城狮QUESTIONWhichtwostatementsdescribecharacteristicsofIPv6unicastaddressing?(ChooseGlobaladdressesstartwithLink-localaddressesstartwithLink-localaddressesstartwithThereisonlyoneloopbackaddressanditisIfaglobaladdressisassignedtoaninterface,thenthatistheonlyallowableaddressfortheCorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑: ipv6的常规问题，globaladdress的其实段位2000::/3这个是定义好了的,D选项说的是换回地址,也就是ipv4的QUESTIONthenetworkadministratorhasbeenaskedtogivereasonsformovingfromipv4toipv6.whataretwovalidreasonsforadoptingipv6overipv4?(choosetwo)netaccessdoesnotrequireanochanageofdestinationaddressintheipv6chanageofsourceaddressintheipv6CorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑: ,QUESTIONAnadministratormustassignstaticIPaddressestotheserversinanetwork.Fornetwork4/29,therouterisassignedthefirstusablehostaddresswhilethesalesserverisgiventhelastusablehostaddress.WhichofthefollowingshouldbeenteredintotheIPpropertiedboxforthesalesIPaddress:4SubnetMask:48DefaultIPaddress:54SubnetMask:DefaultIPaddress:0SubnetMask:48DefaultIPaddress:0SubnetMask:40DefaultIPaddress:0SubnetMask:40DefaultCorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑: QUESTIONWhichsubnetmaskwouldbeappropriateforanetworkaddressrangetobesubnettedforuptoeightLANs,witheachLANcontaining5to26hosts?CorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑: QUESTIONHowmanybitsarecontainedineachfieldofanIPv648CorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑:ht QUESTIONWhichthreeapproachescanbeusedwhilemigratingfromanIPV4addressingschemetoanIPV6scheme.(choosethree)staticallymapIPV4addresstoIPV6configurationIPv4tunnelsbetweenIPV6useDHCPv6tomapIPV4addressestoIPV6 ingandtranslationtotranslateIPV6packetsintoIPV4configureIPV6enabledual-stackCorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑: 攻城狮QUESTIONRefertotheexhibit.InthisVLSMaddressingscheme,whatsummaryaddresswouldbesentfromrouterCorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑: QUESTIONHowisanEUI-64formatinterfaceIDcreatedfroma48-bitMACbyappending0xFFtotheMACbyprefixingtheMACaddresswithbyprefixingtheMACaddresswith0xFFandappending0xFFtobyinserting0xFFFEbetweentheupperthreebytesandthelowerthreebytesoftheMACbyprefixingtheMACaddresswith0xFandinserting0xFaftereachofitsfirstthreeCorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑: 攻城狮QUESTIONRefertotheexhibit.WhichisthemostefficientsummarizationthatR1canusetoadvertiseitsnetworkstoCorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑: QUESTIONWhichoptionisavalidIPv6CorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑: QUESTIONWhichthreearecharacteristicsofanIPV6anycastaddress?(chooseany-to-manycommunicationdeliveryofpacketstothegroupinterfacethatisclosesttothesendingone-to-manycommunicationthesameaddressformultipledevicesintheauniqueIPV6addressforeachdeviceintheCorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑: CE发送到任播地址的分组被转发到最近的端口（节点F组中每个节点有一个唯一的IV6地址（每台设备可以有一个以上的端口，所以用节点来表示anycast》closet、nearestsamedressformultiple攻城狮QUESTIONAnationalretailchainneedstodesignanIPaddressingschemetosupportanationwidenetwork.Theneedsaminimumof300sub-networksanda umof50hostaddressespersubnet.WorkingwithonlyoneClassBaddress,whichofthefollowingsubnetmaskswillsupportanappropriateaddressingscheme?(Choosetwo.)CorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑: 至少300个子网，每个子网至少50台主机。使用一个B类地址来划分。考点分析：这道题考的是VLSM。因为题中说每个网段最多50机器，且2^5<50<2^6，主机位至少是6300个子网，且是B类 每个子网只有30个可IPF：攻城狮QUESTIONRefertotheexhibit.AnetworkadministratorisaddingtwonewhoststoSwitchA.Whichthreevaluescouldbeusedfortheconfigurationofthesehosts?(Choosethree.)hostAIPaddress:hostAIPaddress:hostAdefaultgateway:hostBIPaddress:hostBdefaultgateway:hostBIPaddress:CorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑: 考点分析：A接Port6口，Port6口属于vlan10，所以A属于网段4/27，且网关是8；B接Port9口，Port9口属于vlan20，所以B属于网段28/26，网关是30；单臂路由的攻城狮QUESTIONWhichIPv6addressistheall-routermulticastCorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑: 攻城狮QUESTIONwhichaddressrangeefficientlysummarizestheroutingtableoftheaddressesforrouterCorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑: QUESTIONWhichIPv6addressisCorrectAnswer:Section:IPaddressingIPv4andIPv6 更新/讲解/免费答疑:ht D只能有一个QUESTIONWichcommandcanyouusetom