ccna复习-ccna640-802题库v104.4完美注释版

QUESTIONQUESTIONWhenyouareloggedintoaswitch,whichpromptindicatesthatyouareinprivileged%@>$#Answer:QUESTIONWhichcommandshowssystemhardwareandsoftwareversionshowshowoshowshowaomshowAnswer:查看系统的硬件信息使用令是showQUESTIONCiscoCatalystswitchesCAT1andCAT2haveaconnectionbetweenthemusingportsFA0/13.An802.1QtrunkisconfiguredbetweenthetwoswitchesOnCAT1,VLAN10ischosenasnative,butonCAT2thenativeVLANisnotspecified.Whatwillhappeninthisscenario?802.1QgiantsframescouldsaturatetheVLAN10onCAT1andVLAN1onCAT2willsenduntaggedAnativeVLANmismatcherrormessagewillVLAN10onCAT1andVLAN1onCAT2willsendtaggedAnswer:QUESTION2/29subnet?A.Router(config-B.Router(config-C.Router(config-D.Router(config-E.Router(config-F.Router(config-Answer:QUESTIONThenetworkdefaultgatewayapplyingtoahostbyDHCPis3/28.WhichoptionisthevalidIPaddressofthishost?Answer:C：正确D：网络号E：QUESTIONWhichtwoaddressescanbeassignedtoahostwithasubnetmaskof?(ChooseAnswer:A：网络号B/D： 地址E：网络号QUESTIONThenetworkadministratorhasaskedyoutocheckthestatusoftheworkstation'sIPstackbyingtheloopbackaddress.Whichaddresswouldyoutoperformthistask?Answer:QUESTIONWorkstationAhasbeenassignedanIPaddressof4/28.WorkstationBhasbeenassignedanIPaddressof00/28.Thetwoworkstationsareconnectedwithastraight-throughcable.Attemptstobetweenthehostsareunsuccessful.Whattwothingscanbedonetoallowcommunicationsbetweenthehosts?(Choosetwo.)ChangethesubnetmaskofthehoststoChangethesubnetmaskofthehoststoChangetheaddressofWorkstationAtoAnswer: QUESTIONYourISPhasgivenyoutheaddress/29toassigntoyourrouter'sinterface.Theyhavealsogivenyouthedefaultgatewayaddressof.Afteryouhaveconfiguredtheaddress,therouterisunabletoanyremotedevices.Whatispreventingtherouterfromingremotedevices?ThedefaultgatewayisnotanaddressonthisTheIPaddressisthebroadcastaddressforthisAnswer: 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QUESTIONWhichcommandisusedtocopytheconfigurationfromRAMintocopyrunning-configstartup-copystartup-config:running-copyrunningconfigstartupcopystartupconfigrunningwriteAnswer:QUESTIONWhichcommandisusedtoloadaconfigurationfromaTFTPserverandmergetheconfigurationcopyrunning-config:copyFP:running-copyFT:startup-copystartup-config:Answer:QUESTIONAsystemadministratortypesthecommandtochangethehostnameofarouter.WhereontheCiscoIFSisthatchangestored?Answer:QUESTIONWhichcommandisusedtoconfigureadefaultA.B.C.D.Answer:QUESTIONIfIProutingisenabled,whichtwocommandssetthegatewayoflastresorttothedefaultgateway?(Choosetwo.)ipdefault-gatewayiprouteipdefault-networkipdefault-routeiprouteAnswer:CEipdefault-networkipQUESTIONQUESTIONWhichcommandwouldyouconfiguregloballyonaCiscorouterthatwouldallowyoutoviewdirectlyconnectedCiscodevices?enablecdpcdprunAnswer:QUESTIONWhichcommandisusedtoseethepathtakenbypacketsacrossanIPshowipshowtraceipAnswer:A:查看路由表B：没有这条命令C：正确D：QUESTIONWhichcommandisusedtodebugadebugdebugipdebugdebugAnswer:QUESTIONWhichcommanddisplaysCPUshowshowshowshowAnswer:BQUESTIONQUESTIONWhenconfiguringaserialinterfaceonarouter,whatisthedefaultatm-Answer:QUESTIONbestroute?Answer:QUESTIONAcompany erIPontheirEthernetLAN.Theusersnoticethatnetworkslowsdown,and eitherstuttersorfailscompley.WhatisthemostlikelyreasonforminimumcellratequalityofservicepacketswitchingexchangereliabletransportprotocolAnswer:QUESTIONWhichlayerintheOSIreferencemodelisresponsiblefordeterminingtheavailabilityofthereceivingprogramandcheckingtoseeifenoughresourcesexistforthatcommunication?Answer:QUESTIONDatatransferisslowbetweenthesourceanddestination.ThequalityofservicerequestedbythetransportlayerintheOSIreferencemodelisnotbeingmaintained.Tofixthisissue,atwhichlayershouldthetroubleshootingprocessbegin?Answer:QUESTIONWhichprotocolsarefoundinthenetworklayeroftheOSIreferencemodelandareresponsibleforpathdeterminationandtrafficswitching?Answer:QUESTIONshowshowshowAnswer:QUESTIONWhichthreeoptionsarevalidWANconnectivitymethods?(ChooseAnswer:A:点到点协议，正确 QUESTIONRefertotheexhibit.WhichWANprotocolisbeingFrameAnswer:QUESTIONACSU/DSUconvertsogsignalsfromaroutertoaleasedline;amodemconvertsogsignalsfromaroutertoaleasedline.fromaroutertoaleasedline.fromaroutertoaphoneline.ACSU/DSUconvertsdigitalsignalsfromaroutertoaleasedline;amodemconvertsdigitalsignalsfromaroutertoaphoneline.Answer:QUESTIONAnetworkadministratormustconfigure200switchportstoaccepttrafficfromonlythecurrentlyhostdevices.WhatwouldbethemostefficientwaytoconfigureMAC-levelsecurityonalltheseVisuallyverifytheMACaddressesandthennettotheswitchestoentertheswitchport-portsecuritymac-addresscommand.HaveenduserstheirMACtotheswitchtoentertheswitchport-portsecuritymac-addresscommand.Usetheswitchportport-securityMACaddressstickycommandonalltheswitchportsthathaveenddevicesconnectedtothem.Useshowmac-address-tabletodeterminetheaddressesthatareassociatedwitheachportandthenenterthecommandsoneachswitchforMACaddressport-security.Answer: QUESTIONWhentroubleshootingaFrameRelayconnection,whatisthestepwhenperformingaloopbackSettheencapsulationoftheinterfacetoPlacetheCSU/DSUinlocal-loopEnablelocal-loopmodeontheDCEFrameRelayVerifythattheencapsulationissettoFrameAnswer:QUESTIONWhatoccursonaFrameRelaynetworkwhentheCIRisAllTCPtrafficismarkeddiscardAllUDPtrafficismarkeddiscardeligibleand AllTCPtrafficismarkeddiscardeligibleand isAlltrafficexceedingtheCIRismarkeddiscardAnswer:QUESTIONWhataretwocharacteristicsofFrameRelaypoint-to-pointsubinterfaces?(ChooseTheycreatesplit-horizonTheyrequireauniquesubnetwithinaroutingTheyemulaeasedTheyareidealforfull-meshTheyrequiretheuseofNBMAoptionswhenusingAnswer: 每个子接口需要一个独立的网段，正确。C：QUESTIONRefertotheexhibit.Addresseswithintherange/24arenotbeingtranslatedtothe1.128.0/16range.Whichcommandshowsif/24areallowedinsideaddresses?debugipshowaccess-showipnatshowipnatAnswer: QUESTIONaccesspointdoesnotlistanyactiveWLANclients.Whatisapossiblereasonforthis?TheincorrectchannelisconfiguredontheTheclient'sIPaddressisonthewrongTheisconfiguredincorrectlyontheAnswer: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：QUESTIONWhichtwofeaturesdidv1addtoaddresstheinherentweaknessesfoundin?(ChooseastrongerencryptionkeymixingusingtemporalsharedkeyashorterinitializationperframesequenceAnswer: QUESTIONWhichtwowirelessencryptionmethodsarebasedontheRC4encryptionalgorithm?(ChooseAnswer: QUESTIONWhataretwocharacteristicsofRIPv2?(Chooseclassfulroutingvariable-lengthsubnetbroadcastmanualrouteusesSPFalgorithmtocomputeAnswer: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：QUESTIONWhichtwoEthernetfiber-opticmodessupportdistancesofgreaterthan550Answer:QUESTIONWhattwothingswillarouterdowhenrunningadistancevectorroutingprotocol?(ChooseSendentireroutingtabletoallroutersintheroutingMaintainthetopologyoftheentirenetworkinitsAnswer:A：周期性更新，正 发送整个路由表到整个路由域，错误，只发送给邻居C： QUESTIONRefertotheexhibit.Accordingtotheroutingtable,wherewilltheroutersendapacketdestinedforAnswer:QUESTIONWhichcommandshowsifanaccesslistisassignedtoanshowipinterface[interface]access-showipaccess-listsinterfaceshowipinterfaceshowipaccess-listsAnswer:QUESTIONRefertotheexhibit.WhichruledoestheDHCPserverusewhenthereisanIPaddressTheaddressisremovedfromthepooluntiltheisTheaddressremainsinthepooluntiltheisOnlytheIPdetectedbyGratuitousARPisremovedfromtheOnlytheIPdetectedbyisremovedfromtheTheIPwillbeshown,evenaftertheisAnswer:showipdhcp命令可以查看哪些ip地址在使用上有。有的地址不再分配出去。 QUESTIONRefertotheexhibit.YouareconnectedtotherouterasuserMike.WhichcommandallowsyoutoseeoutputfromtheOSPFdebugcommand?terminalshowshowshowipospfAnswer: QUESTIONRefertotheexhibit.Ifnumber2isselectedfromthesetupscript,whathappenswhentheuserrunssetupfromaprivilegedprompt?SetupisadditiveandanychangeswillbeaddedtotheconfigSetupeffectivelystartstheconfigurationoverasiftherouterwasbootedfortheSetupwillnotrunifanenablesecretpasswordexistsontheSetupwillnotrun,becauseitisonlyviablewhennoconfigurationexistsontheAnswer:C：如果配置了，设置不会运行 QUESTIONRefertotheexhibit.Which(config-router)commandwillallowthenetworkrepresentedontheinterfacetobeadvertisedbyRIP?redistributenetworkredistributenetworkAnswer:QUESTIONRefertotheexhibit.WhatinformationcanbegatheredfromtheOnerouterisrunningRIPneighborisThenetworkcontainsaNetworkisAnswer:QUESTIONRefertotheexhibit.WhattypeofconnectionwouldbesupportedbythecablediagramPCtoPCtoservertoroutertoAnswer:QUESTIONRefertotheexhibit.WhattypeofconnectionwouldbesupportedbythecablediagramPCtoPCtoservertoswitchtoAnswer:QUESTIONWhichtwostatementsdescribetheCiscoimplementationofVLANs?(ChooseVLAN1isthedefaultEthernetCDPadvertisementsareonlysentonVLANBydefault,themanagementVLANisVLANBydefault,theswitchIPaddressisinVLANVLAN1002through1005areautomaticallycreatedandcannotbeAnswer: QUESTIONNoconfigurationfilewasfoundinNoconfigurationfilewasfoundinNoconfigurationfilewasfoundinthePCMCIAConfigurationfileisnormalandwillloadin15Answer:QUESTIONRefertotheexhibit.Whatcanbedeterminedfromtheislocaltotheislocaltothewillageoutinlessthan1hasagedoutandismarkedforAnswer:age下面-QUESTIONRefertotheexhibit.Whichcommandwouldallowthetranslationstobecreatedontheipnatpoolmynats54prefix-lengthipnatoutsidemynats54prefix-lengthipnatpoolmynats54prefix-lengthipnatoutsidemynats54prefix-lengthAnswer:prefix-length表示掩码的长度。prefix-length19表示掩码为QUESTIONRefertotheexhibit.Anadministratorsthedefaultgatewayatandseestheoutputasshown.AtwhichOSIlayeristheproblem?datalinkapplicationaccesssessionAnswer:QUESTIONRefertotheexhibit.WhichvaluewillbeconfiguredforDefaultGatewayoftheLocalAreaAnswer:QUESTIONRefertotheexhibit.TheuseratWorkstationBreportsthatServerAcannotbereached.WhatispreventingWorkstationBfromreachingServerA?TheIPaddressforServerAisabroadcastThegatewayforWorkstationBisnotonthesameThegatewayforServerAisnotonthesameAnswer:QUESTIONRefertotheexhibit.Whatdoesthe(*)representinthePacketisdestinedforalocalinterfacetothePacketwastranslated,butnoresponsewasreceivedfromthedistantPacketwasnottranslated,becausenoadditionalportsarePacketwastranslatedandfastswitchedtotheAnswer:QUESTIONRefertotheexhibit.WhatcommandsequencewillenablePATfromtheinsidetooutside(config)ipnatpoolisp-netnetmask(config-if)ipnatoutside(config)ipnatinsidesourcelist1interfaceethernet1(config-if)ipnatinsideAnswer:QUESTIONRefertotheexhibit.WhatwillhappentoHTTPtrafficcomingfromtheInternetthatisdestinedfor0ifthetrafficisprocessedbythisACL?Trafficwillbedroppedperline30oftheTrafficwillbeacceptedperline40oftheTrafficwillbedropped,becauseoftheimplicitdenyallatoftheTrafficwillbeaccepted,becausethesourceaddressisnotcoveredbytheAnswer:QUESTIONRefertotheexhibit.WhichstatementdescribestheeffectthattheRouter1configurationhasondevicesinthesubnetwhentheytrytoconnecttoSVR-AusingnetorSSH?DeviceswillnotbeabletousenetorDeviceswillbeabletouseSSH,butnotDeviceswillbeabletousenet,butnotDeviceswillbeabletousenetandAnswer:题目考查的是ACL用法，首先看图示要控制的是172网段也就是F0/0是in方向f0/1应该是out通过此图看出list100为fa0/0的in方而list101是f0/1的in172生效的是list只要看list100就可以选出答案可以QUESTIONVLANsestablishbroadcastsinswitchedVLANsprovideamethodofconservingIPaddressesinlargeVLANsallowaccesstonetworkservicesbasedondepartment,notphysicalVLANscangreatlysimplifyadding,moving,orchanginghostsontheAnswer:A：VLAN在交换网络中建立广播域，正确E：vlan允许基于逻辑划分的网络，不是物理位置。正确。F：QUESTIONAnadministratorwouldliketoconfigureaswitchoveravirtualterminalconnectionfromlocationsoutsideofthelocalLAN.Whichofthefollowingarerequiredinorderfortheswitchtobeconfiguredfromaremotelocation?(Choosetwo.)The The ustbeconnectedtoarouteroveraVLANTheswitustbereachablethroughaportconnectedtoitsmanagementThe The ustbefullyconfiguredasanSNMPAnswer:QUESTIONWhichofthefollowinghostaddressesaremembersofnetworksthatcanberoutedacrossthepublicInternet?(Choosethree.)Answer:QUESTIONGivenasubnetmaskof24,whichofthefollowingaddressescanbeassignedtonetworkhosts?(Choosethree.)Answer:QUESTIONWhichofthefollowingarebenefitsofVLANs?(ChooseTheyincreasethesizeofcollisionTheyallowlogicalgrouofusersbyTheycanenhancenetworkTheyincreasethesizeofbroadcastswhiledecreasingthenumberofcollisionTheyincreasethenumberofbroadcastswhiledecreasingthesizeofthebroadcastTheysimplifyswitchAnswer: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:QUESTIONWhichrouterIOScommandscanbeusedtotroubleshootLANconnectivityproblems?(ChooseshowipshowAnswer:A：测试连通性 查看是否有路由F：QUESTIONRefertotheexhibit.AfterHostAsHostB,whichentrywillbeintheARPcacheofHostAtosupportthisAnswer:MAC作为sourcegateway的mac作为destination封装Frame，然后将Frame转发但是数据包是不会进QUESTIONWhichtwotopologiesareusingthecorrecttypeoftwisted-paircables?(Choosetwo.)Answer:QUESTIONWhichofthefollowingaretrueregardingbridgesandswitches?(ChooseBridgesarefasterthanswitchesbecausetheyhavefewerAswitchisamultiportBridgesandswitcheslearnMACaddressesbyexaminingthesourceMACaddressofeachframeAnswer:A：网桥比交换机更快速，因为他们有更少的 通过检查数据包的sourcemac学习mac地址，正确D： QUESTIONWhataresomeoftheadvantagesofusingaroutertosegmentthenetwork?(ChooseFilteringcanoccurbasedonLayer3BroadcastsareRoutersgenerallycostlessthanBroadcastsarenotforwardedacrosstheAnswer:A：可以基于层三的信息过滤数据。B： 路由器的价格一般比交换机少。错误D：QUESTIONWhichofthefollowingstatementsaretrueregardingbridgesandswitches?(ChooseSwitchesareprimarilysoftwarebasedwhilebridgesarehardwareBothbridgesandswitchesforwardLayer2BridgesarefrequentlyfasterthanSwitcheshaveahighernumberofportsthanmostBridgesdefinebroadcastswhileswitchesdefinecollisionBothbridgesandswitchesmakeforwardingdecisionsbasedonLayer2Answer: QUESTIONWhichcharacteristicsarerepresentativeofalink-stateroutingprotocol?(Chooseprovidescommonviewofentireexchangesroutingtableswithcalculatesshortestutilizesevent-triggeredutilizesfrequentperiodicAnswer:A:提供查看拓扑令，正确。showipospf QUESTIONWhichofthefollowingstatementsdescribethenetworkshowninthegraphic?(ChooseTherearetwobroadcastsintheTherearefourbroadcastsintheTherearesixbroadcastsintheTherearefourcollisionsintheTherearefivecollisionsintheTherearesevencollisionsintheAnswer:QUESTIONUsetheoutputfromtheroutershowninthegraphicabovetodeterminewhichofthefollowingarecorrect.(Choosetwo.)RouterJohnwillreceiveroutingupdatesontheSerial0/0RouterJohnwillreceiveroutingupdatesontheSerial0/1RouterJohnwillsendroutingupdatesouttheSerial0/0RouterJohnwillsendroutingupdatesouttheFastEthernet0/0RouterJohnwillsendroutingupdatesouttheSerial0/1Answer:QUESTIONAnationalretailchainneedstodesignanIPaddressingschemetosupportanationwidenetwork.Thecompanyneedsaminimumof300sub-networksandaumof50hostaddressespersubnet.WorkingwithonlyoneClassBaddress,whichofthefollowingsubnetmaskswillsupportanappropriateaddressingscheme?(Choosetwo.)Answer: 每个子网只有30个可用IPF：QUESTIONGiventheaddress9/28,whichofthefollowingarevalidhostaddressesonthissubnet?(Choosetwo.)Answer:QUESTIONAninboundaccesslisthasbeenconfiguredonaserialinterfacetodenypacketentryforTCPandUDPports21,23and25.WhattypesofpacketswillbepermittedbythisACL?(Choosethree.)Answer:acl了tcp/udp212325这三个端口的流量，哪些流量会被放行？A：FTP21端口 NET23端口C：SMTP25端口D：DNS53端口E：HTTP80端口FPOP3110QUESTIONWhicharevalidmodesforaswitchportusedasaVLANtrunk?(ChooseAnswer:QUESTIONOSPFroutingusestheconceptofareas.WhatarethecharacteristicsofOSPFareas?(ChooseEachOSPFarearequiresaloopbackinterfacetobeAreasmaybeassignedanynumberfrom0toArea0iscalledthebackboneHierarchicalOSPFnetworksdonotrequiremultipleMultipleOSPFareasmustconnecttoareaSingleareaOSPFnetworksmustbeconfiguredinareaAnswer:A：每个区域需要换回口，错误B：区域ID的范围是0--65535，正确C： QUESTIONWhatinformationdoesarouterrunningalink-stateprotocolusetobuildandmaintainitstopologicaldatabase?(Choosetwo.)oSAPmessagessentbyotherLSAsfromotherbeaconsreceivedonpoint-to-pointroutingtablesreceivedfromotherlink-stateTTLpacketsfromdesignatedAnswer: 通过其他路由器的LSA，正确。D：从QUESTIONItsupportsItisusedtoroutebetweenautonomousItconfinesnetworkinstabilitytooneareaoftheItincreases erheadontheItallowsextensivecontrolofroutingItissimplertoconfigurethanRIPAnswer: QUESTIONTheswitchesshowninthediagram,CoreandCore2,arebothCatalyst2950s.Theaddressingschemeforeachcompanysiteisasfollows:RouterEthernetport-1stusableaddressCore-2ndusableaddressCore2-3rdusableForthisnetwork,whichofthefollowingcommandsmustbeconfiguredonCore2toallowittobemanagedremoyfromanysubnetonthenetwork?(Choosethree.)Core2(config)#interfaceCore2(config-if)#ipaddress0Core2(config)#interfacevlanCore2(config-if)#ipaddress1Core2(config)#linecon0Core2(config-line)#passwordciscoCore2(config)#linevty04Core2(config-line)#passwordciscoCore2(config)#ipdefault-gatewayCore2(config)#iprouteAnswer: QUESTIONAnadministratorisunsuccessfulinaddingVLAN50toaswitch.Whiletroubleshootingtheproblem,theadministratorviewstheoutputoftheshowvtpstatuscommand,whichisdisplayedinthegraphic.WhatcommandsmustbeissuedonthisswitchtoaddVLAN50tothedatabase?(Choosetwo.)Switch(config-if)#switchportaccessvlanSwitch(vlan)#vtpSwitch(config)#config-revisionSwitch(config)#vlan50nameSwitch(vlan)#vlanSwitch(vlan)#switchporttrunkvlanAnswer:QUESTIONWhichofthefollowingIPaddressesfallintotheCIDRblockof/22?(ChooseAnswer:QUESTIONWhichofthefollowingaretypesofflowcontrol?(ChoosecongestionloadAnswer:A：缓存B：直通C：D：E：QUESTIONWhichdestinationaddresseswillbeusedbyHostAtosenddatatoHostC?(ChoosetheMACaddressofSwitchtheIPaddressofHosttheMACaddressofHosttheIPaddressoftherouter'sE0theMACaddressoftherouter'sE0Answer:QUESTIONWhatcanbedeterminedfromthelineofshowiprouteoutputshownintheexhibit?(ChooseThenextroutingupdatecanbeexpectedin35ThisrouteisusingthedefaultadministrativeThenetworkistwohopsawayfromthisAnswer:s/1C：错误。s0/1的ip无法得知 正确，rip缺省的管理距离是120E：QUESTIONRefertotheexhibit.Alloftheroutersinthenetworkareconfiguredwiththeipsubnet-zerocommand.WhichnetworkaddressesshouldbeusedforLinkAandNetworkA?(Choosetwo.)NetworkA-NetworkA-NetworkA-LinkA-LinkA-LinkA-Answer:配置了ipsubnet-zero，可以使用全0网段。 E:错误，包含在2/27网段中QUESTIONWhichtwosubnetworkswouldbeincludedinthesummarizedaddressof/20?(Choose6Answer:QUESTIONThenetworkadministratorhasdiscoveredthatthepowersupplyhasfailedonaswitchinthecompanyLANandthattheswitchhasstoppedfunctioning.IthasbeenreplacedwithaCiscoCatalyst2950seriesswitch.Whatmustbedonetoensurethatthisnewswitch estherootbridgeonthenetwork?LowerthebridgepriorityChangetheMACaddressoftheIncreasetheVTPrevisionnumberfortheLowertherootpathcostontheswitchAssigntheswitchanIPaddresswiththelowestAnswer:考点：STP的原则RID优先级+mac地址QUESTIONRefertotheexhibit.Assumethatalloftherouterinterfacesareoperationalandconfiguredcorrectly.HowwillrouterR2beaffectedbytheconfigurationofR1thatisshownintheexhibit?RouterR2willnotformaneighborrelationshipwithRouterR2willobtainafullroutingtable,includingadefaultroute,fromR2willobtainOSPFupdatesfromR1,butwillnotobtainadefaultroutefromR2willnothavearouteforthedirectlyconnectedserialnetwork,butallotherdirectlyconnectednetworkswillbepresent,aswellasthetwoEthernetnetworksconnectedtoR1.Answer:QUESTIONWhichthreeIPaddressescanbeassignedtohostsifthesubnetmaskis/27andsubnetzeroisusable?(Choosethree.)Answer:E：刚好是网络号，错误F：QUESTIONarrivesattheHokesBrouter.WhtiondoestherouterforwardsthereceivedpacketouttheSerial0/0forwardsapacketcontaininganEIGRPadvertisementouttheSerial0/1Answer:QUESTIONRefertotheexhibit.FromRouterA,anetworkadministratorisabletotheserialinterfaceofRouterBbutunabletoanyofthesubnetsattachedtoRouterB.Basedonthepartialoutputsintheexhibit,whatcouldbetheproblem?EIGRPdoesnotsupportTheEIGRPnetworkstatementsareincorrectlyTheIPaddressingontheserialinterfaceofRouterAisTheroutingprotocolhassummarizedontheclassfulEIGRPhasbeenconfiguredwithaninvalidautonomoussystemAnswer:QUESTIONItconvergesItusescosttodeterminethebestItusestheDUALalgorithmtodeterminethebestOSPFroutersdiscoverneighborsbeforeexchangingroutingAnswer:ACF 使用dual算法，错误，这个是EIGRP的算法E： QUESTIONRefertotheexhibit.SW1andSW2havedefaultconfigurations.Whatwillhappenifhost1sendsaHosts2,3,and4willreceivetheHosts1,2,3,and4willreceivetheHost2andtheFa0/0interfaceofR1willreceivetheHosts2,3,4,andinterfacesFa0/0andFa0/1ofR1willreceivetheAnswer:QUESTIONArouterhaslearnedthreepossibleroutesthatcouldbeusedtoreachadestinationnetwork.OnerouteisfromEIGRPandhasacompositemetricof20514560.AnotherrouteisfromOSPFwithametricof782.ThelastisfromRIPv2andhasametricof4.WhichrouteorrouteswilltherouterinstallintheroutingtheOSPFtheEIGRPtheRIPv2allthreetheOSPFandRIPv2Answer:EIGRPOSPFRIPQUESTIONForwhattwopurposesdoestheEthernetprotocolusephysicaladdresses?(ChoosetouniquelyidentifydevicesatLayertoallowcommunicationwithdevicesonadifferenttodifferentiateaLayer2framefromaLayer3toestablishaprioritysystemtodeterminewhichdevicegetstotransmittoallowcommunicationbetweendifferentdevicesonthesametoallowdetectionofaremotedevicewhenitsphysicaladdressisAnswer:A：在二层唯一确定一台设备，正 QUESTIONAsaframeleavesaLayer3device,theLayer2encapsulationinformationischangedfromwhatitwaswhenitenteredthedevice.Forwhattworeasonscanthishappen?(Choosetwo.)Thedataismovingfrom10BASE-TXto100BASE-TheWANencapsulationtypehasThedataformathaschangedfromogtoThesourceanddestinationhostsareinthesameThesourceanddestinationMACaddresseshaveAnswer: QUESTIONPassiveroutesareintheprocessofbeingcalculatedbyEIGRPsupportsVLSM,routesummarization,androutingupdateEIGRPexchangesfullroutingtableinformationwithneighboringrouterswitheveryIfthefeasiblesuccessorhasahigheradvertiseddistancethanthesuccessorroute,it estheprimaryroute.Aqueryprocessisusedtodiscoverareplacementforafailedrouteifafeasiblesuccessorisnotidentifiedfromthecurrentroutinginformation.Answer: QUESTIONRefertotheexhibit.Inthecommunicationbetweenhost1andhost2overthepoint-to-pointWAN,whichprotocolortechnologyisrepresentedbydashedlineA?Answer: D：ieee802.3QUESTIONRefertotheexhibit.TheswitchinthegraphichasadefaultconfigurationandtheMACtableisfullypopulated.Inaddition,thisnetworkisoperatingproperly.ThegraphicrepresentsselectedheaderinformationinaframeleavinghostA.Whatcanbeconcludedfromthisinformation?TheMACaddressofhostAisTherouterwillforwardthepacketinthisframetotheTheswitchwillonlyforwardthisframetotheattachedrouterAlldevicesinthisLANexcepthostAwillpassthepackettoLayerAnswer:QUESTIONWhatisanappropriateuseofadefaulttoprovideroutingtoalocalwebtoprovideroutingfromanISPtoastubtoprovideroutingthatwilloverridetheconfigureddynamicroutingtoprovideroutingtoadestinationthatisnotspecifiedintheroutingtableandwhichisoutsidethelocalAnswer:A：提供路由到本地webB：QUESTIONRefertotheexhibit.Ajuniornetworkengineerhaspreparedtheexhibitedconfigurationfile.Whattwostatementsaretrueoftheplannedconfigurationforinterfacefa0/1?(Choosetwo.)ThetwoFastEthernetinterfaceswillrequireNATconfiguredontwooutsideserialAddresstranslationonfa0/1isnotrequiredforDMZDevicestoaccesstheThefa0/1IPaddressoverlapswiththespaceusedbyThefa0/1IPaddressisinvalidfortheIPsubnetonwhichitInternethostsmaynotinitiateconnectionstoDMZDevicesthroughtheconfigurationthatisAnswer:QUESTIONRefertotheexhibit.Tworoutershavejustbeenconfiguredbyanewtechnician.Allinterfacesareup.However,theroutersarenotsharingtheirroutingtables.Whatistheproblem?SplithorizonispreventingRouter2fromreceivingroutinginformationfromRouter1isconfiguredforRIPversion2,andRouter2isconfiguredforRIPversionRouter1hasanACLthatisblockingRIPversionThereisaphysicalconnectivityproblembetweenRouter1andRouter1isusingauthenticationandRouter2isAnswer:QUESTIONAmedium-sizedcompanyhasaClassCIPaddress.IthastwoCiscoroutersandonenon-Ciscorouter.AllthreeroutersareusingRIPversion1.Thecompanynetworkisusingtheblockof/24.ThecompanyhasdecideditwouldbeagoodideatosplitthenetworkintothreesmallersubnetsandcreatetheoptionofconservingaddresseswithVLSM.Whatisthebestcourseofactionifthecompanywantstohave40hostsineachofthethreesubnets?ConvertalltherouterstoEIGRPanduse2/27,4/27,and2/27asthenewsubnetworks.asthenewsubnetworks.asthenewsubnetworks.ConvertalltherouterstoRIPversion2anduse4/26,28/26,and133.219.192/26asthenewsubnetworks.ConvertalltherouterstoOSPFanduse6/28,2/28,and8/28asthenewsubnetworks.Answer:QUESTIONRefertotheexhibit.WhyhasthisswitchnotbeenelectedtherootbridgeforIthasmorethanoneinterfacethatisconnectedtotherootnetworkItisrunningRSTPwhiletheelectedrootbridgeisrunning802.1dspanningIthasahigherMACaddressthantheelectedrootIthasahigherbridgeIDthantheelectedrootAnswer:考点：考查STP原则，RID小者优先。由提示可知根桥的RID为20481A： QUESTIONRefertotheexhibit.AtofanRSTPelectionprocess,whichaccesslayerswitchportwillassumethediscardingrole?Switch3,portSwitch3,portAnswer:W3为跟桥，W4会选一个口作根端，另堵塞。两个口o同下端的为跟口，的堵。QUESTIONRefertotheexhibit.HowmanypathscantheEIGRProutingprocessusetoforwardpacketsfromHQ_Routertoaneighborrouter?twoequal-costtwounequal-costthreeequal-costfourequal-costfourunequal-costAnswer:考点：考查EIGRP负载均衡。根据提示，variance=3um=4，所以支持不等价负载均衡，最多支持A：2条等价路径，错误B：2C：三条等价路径，错误D：三条不等价路径，错误E：四条等价路径，错误F：四条不QUESTIONSelecttheactionthatresultsfromexecutingtheseSwitch(config-if)#switchportport-AdynamicallylearnedMACaddressissavedinthestartup-configurationAdynamicallylearnedMACaddressissavedintherunning-configurationAdynamicallylearnedMACaddressissavedintheVLANStaticallyconfiguredMACaddressesaresavedinthestartup-configurationfileifframesfromthataddressarereceived.StaticallyconfiguredMACaddressesaresavedintherunning-configurationfileifframesfromthataddressarereceived.Answer:DAtatupcnfigE:Augnfiungnfi里了。QUESTIONRefertotheexhibit.Thefollowingcommandsareexecutedoninterfacefa0/1of2950Switch(config-if)#switchportport-security2950Switch(config-if)#switchportport-securitymac-addresssticky2950Switch(config-if)#switchportport-securityum1TheEthernetframethatisshownarrivesoninterfacefa0/1.Whattwofunctionswilloccurwhenthisframeisrece