月满分902题库带笔记和讲解对应8ccnp.642-v200完美版

ExamQUESTIONRefertotheexhibit.Whichstatementistrue?Selectthebestresponse.RouterRAR1willacceptonlyroute/19fromitsBGPneighbRouterRAR1willsendonlyroute/19toitsBGPneighbOnlytrafficwithadestinationfrom/19willbeOnlytrafficgoingto/19willbeAnswer:Section:用distribute-list对从bgp邻居过来的进站路由表项进行过滤。如图所示，在策略中in影响本地路由器out影响图中控制列表中反演码是为匹配网络号和子网掩码，注意0是精确匹配，1是任意匹配，224就是3位，也就是19位，所以是permit/19QUESTIONRefertotheexhibit.Whichtheestatementsaccura ydescribetheresultofapplyingtheexhibitedroutemap?(Choosethree.)Select3Themapprohibitstheredistributionofalltype2externalOSPFroutesithtag6Themapprohibitstheredistributionofalltype2externalOSPFrotThemapredistributesintoEIGRPallroutesthatmatchthep prefixlistandthefivemetricvalues40000,1000,255,1,and1500.Themapprohibitstheredistributionofallexternal uteswithtag6Allroutesthatdonomatchclauses10and20ofthroemapareredistributedwiththeirtagssettoThemappermitstheredistributionofalltype1eernalOSPFAnswer:Section:同一个route-map子项中多个mtc是与的关系，而不同route-map子项间是或的关系。过滤掉了type-2，那么就剩下type-1能过。图中有tag6，E2类型的OSPF重分发；允许所有的E1类型路由；把其他未过滤掉的路由打上Tag8标记QUESTIONRefertotheexhibit.EIGRPhasbeenconfiguredonallroutersinthenetwork.WhatadditionalconfigurationstatementshouldbeincludedonrouterR4toadvertiseadefaultroutetoitsneighbors?SelectthebestR4(config)#ipdefault-networkR4(config)#iprouteR4(config)#iprouteAnswer:Section:EIGRP在默认路由是使用ipdefault-network10.QUESTIONIntowhichtwotypesofareaswouldanarabrderrouter(ABR)injectadefaultroute?(Choosetwo.)Select2response(s).theautonomoussystemofaiffrentinteriorgatewayprotocolareatotallytheautonomoussystemofanexteriorgatewayprotocolAnswer:Section:哪两种类型区域让ABR一条默认路由，当然是stub区域和totallystubby区域。注意NSSA区域中默QUESTIONWhichthreerestrictionsapplytoOSPFstubareas?(Choosethree.)Select3NovirtuallinksareTheareacannotbeabackboneRedistributionisnotallowedunlessthepacketischangedtoatype7Theareahasnomorethan10NoautonomoussystemborderroutersareInterarearoutesareAnswer:Section:殊区域NSSA中，不能出现在stubarea，原因是stubarea不能引入外部路由。QUESTIONWhatarethetworeasonsfortheappearanceofasthenexthopforanetworkintheshowipbgpcommandoutput?(Choosetwo.)Select2ThenetworkwasoriginatedviaredistributionofaninteriorgatewayprotocolintoThenetworkwasdefinedbyastaticThenetworkwasoriginatedviaanetworkoraggregateThenetworkwaslearnedviaThenetworkwaslearnedviaAnswer:Section:用showipbgp命令发现路由下一条地址为，这说明这条路由是它自己产生的。在BGP中，自己产生路由的方式有重分发，使用network命令，使用合aggregate命令。QUESTIONRefertotheexhibit.Whichtwostatemetsaretrueaboutthepartialconfigurationthatisprovided.(ChooseSelect2AlltheconfiguredneighborsareinautonomoussystemThepeergroupshortenstheIBGPThepeergroupshortenstheEBGPOnlytheoutgoingfiltersareappliedtoBGPThreeAS-pathfiltersareappliedtoeachBGPAnswer:Section:QUESTIONRefertotheexhibit.Whichtwostatementsarecorrect?(Choosetwo.)Select2AllsixrouteswillbeinstalledintheroutingTworouteswillbeinstalledintheroutingtabFourrouteswillbeinstalledintheroutingtabAlltherouteswereredistributedintoBGPomanAlltherouteswereoriginatedbyBGPiththenetworkAnswer:Section: QUESTIONWhataretworulesforcompactingIPv6addresses?(Choosetwo.)Select2 umnumberoftimesadoublecoloncanreplacea16-bitsegmentthatconsistsofallzeroesistwo.Theleadingzeroesinany16-bitsegmentdonothavetobeEvery16-bitsegmentthatconsistsofallzeroescanberepresentedwithasingleThetrailingzeroesinany16-bitsegmentdonothavetobeAnysingle,continuousstringofoneormore16-bitsegmentsthatconsistsofallzeroescanberepresentedwithadoublecolon.Twozeroesinthemiddleofany16-bitsegmentdonothavetobeAnswer:Section:每个16位组开始的0可以省任意多个为0的16位组可以用::表示，但是一个ipv6的地址中只允许出现一次QUESTIONWhatisthedifferencebetweentheIPv6addresses::/0and::/128?Selectthebest::/0istheunspecifiedaddress,and::/128isthemulticast::/0istheunicastaddress,and::/128istheanycast::/0istheunicastaddress,and::/128isthemulticast::/0istheanycastaddress,and::/128isthemulticast::/0isthedefaultroute,and::/128istheunspecified::/0istheanycastaddress,and::/128isthedefaultAnswer:Section:QUESTIONRefertotheoutput.WhatIOScommand isoutput?Selectthebestshowipshowipospfshowipv6ospfshowipv6Answer:Section:ospfv3是专门为ipv6设计的，然后第一行又是出现的进程信息，所以是命令是showipv6ospf大家可以敲一遍QUESTIONRefertotheexhibit.RouterRTAisthehubrouterforroutersRTBandRTC.TheFrameRelaynetworkisconfiguredwithEIGRP,andtheentirenetworkisinautonomoussystem1.However,routerRTBandRTCarenotreceivingeachother'sroutes.Whatisthesolution?Selectthebestresponse.Configuretheautosummarycommandunderroutereigrp1onrouterIssuethenoipsplithorizoncommandonrouterConfiguresubinterfacesonthespokeroutersandassigndifferentIPaddresssubnetsforeachCheckandchangetheaccesslistsonrouterIssuethenoipsplithorizoneigrp1commandonrouterConfigureadistributelistonrouterRTAthatallowsittoadvertiseallroutestothespokeAnswer:Section:framerelay是一个多路复用技术，图中RTB将自己的路由给路由器RTA的s0/0口，因为水平分割的原图中的拓扑是一个hubandspoke结构，然后上面运行的是EIGRP协议。注意在星型结构中，边缘路由器会QUESTIONArouterhastwopathstoreachanothernetworkinadifferentautonomoussystem.Neitherroutewasgeneratedbythelocalrouterandbothrouteshavethesamedefaultweightandlocalpreferencevalues.WhichstatementistrueabouthowBGPwouldselectthebestpath?SelectthebestIfthecommandbgp pare-medhasbeengiven,thentherouterwillprefertheroutewiththehighestMED.TherouterwillprefertheroutewiththelowerTherouterwillprefertheshortestautonomoussystemToinfluenceoneroutetobepreferred,itsdefaultlocalpreferencevaluewillbechangedviatheuseofthecommandbgpdefaultlocal-preference50.Answer:Section:权本:local-pref默认为,M:MED，最小MED， 11步：lowestRID如题干描述所示bothrouteshaehesamedefaultweightandlocalpreferencevaluesweight和localQUESTIONRefertotheexhibit.Onthebasisoftheinformationintheexhibit,whichtwostatementsaretrue?(ChooseSelect2TheoutputwasgeneratedbyenteringtheshowipbgpcommandontheISPTheoutputwasgeneratedbyeneringtheshowipbgpcommandontheSanJose1Theserial0/0/1interfacentheISProuterhasbeenconfiguredwiththesetmetric50Theserial0/0/1interfaentheISProuterhasbeenconfiguredwiththesetmetric75WhentrafficissentfromtheISPtoautonomoussystem64512,thetrafficwillbeforwardedtoSanJose1becauseofthelowerMEDvalueofSanJose1.WhentrafficissentfromtheISPtoautonomoussystem64512,thetrafficwillbeforwardedtoSanJose2becauseofthehigherMEDvalueofSanJose2.Answer:Section:router的直连路由，所以上图是ISP上运行的showipbgp产生的，A正确。如图所示除了MED，其他的属性都一样QUESTIONRefertotheexhibit.Onthebasisoftheconfigurationthatisprovided,howwouldtheBGPupdatesthatcomefromrouterR1bereplicatedinsideautonomoussystem65200?SelectthebestAllBGPupdatesthatarereceivedonrouterR2willbesenttoroutersR3andR4.RoutersR3andR4willthenforwardthoseBGPupdatestrouterR5.AllBGPupdatesthatarereceived uterR2willnotbesenttoroutersR3andAllBGPupdatesthatarereceivdorouterR2willbesentdirectlytorouterNoneoftheBGPupdatesthaaereceivedonrouterR2willeverbereceivedbyrouterAnswer:Section:QUESTIONHowisauthenticationhandledwithOSPFv3?Selectthebestresponse.OSPFv3forIPv6authenticationissupportedbySHA-1OSPFv3forIPv6authenticationissupportedbyMD5OSPFv3forIPv6authenticationissupportedbyIPv6OSPFv3forIPv6authenticationissupportedbyIPv4Answer:Section:QUESTIONRefertotheexhibit.RouterRT-1choosesonepathtonetwork/24.IndicatethereasonRouterRT-1choosesthis"best"path.SelectthebestInmakingitsdecisionbotthebestpath,RT-1givesprecedencetotheoriginInmakingitsdecisioaoutthebestpath,RT-1givesprecedencetotheBGPMEDIPaddressislowerthanInmakingitsdecisionaboutthebestpath,RT-1preferstheIGPRT-1prefersinternalBGPIPaddressislowerthanAnswer:Section:选路过程（按比较的先后顺序）：1WeightBiggerisbetter)2Localpreference(Biggerisbetter3Selforiginated(LocallyinjectedisbetterthaniBGP/eBGPlearned)4.AS-Path(Smallerisbetter)5.Origin(PreferORIGINcodeIoverE,andEover?)6.MED(Smallerisbetter)QUESTIONRefertotheexhibit.RouterRT-1androuterRT-2bothadvertisenetwork/16torouterRT-3viainternalBGP.WhatisthereasonthatrouterRT-3choserouterRT-1asitsbestpathtonetworkSelectthebestItadvertisesthebestAS-ItadvertisesthebestoriginItadvertisesthebestItadvertisesthebestlocalIthasabetterrouterItadvertisesalowerauonomousAnswer:Section:权本:local-pref默认为,M:MED，最小MED， 11步：lowestRID注意描述：QUESTIONUsingtherulesforIPv6addressing,howcantheaddress2031:0000:240F:0000:0000:09C0:123A:121Bberewritten?Selectthebestresponse.Answer:Section:QUESTIONWhattwosituationscouldrequiretheuseofmultipleroutingprotocols?(Choostwo)Select2whenusingUNIXhost-basedwhensmaller sarebecausehavingmultipleroutingprotocolsconfuseshackwhenmigratingfromanolderInteriorGatewayProtocolGP)toanewwhenallequipmentismanufacturedbywhentherearemultiplepathstodestinationneAnswer:Section:QUESTIONDuringBGPconfigurati narouterthathaspeeredwithotherBGPspeakers,theBGPcommandaggregate-addressisissued.However,thepeersdonotreceivethisaggregatenetworkinBGPadvertisements.Also,therouterdoesnothavethisaggregatenetworkinitsBGPtable.Whichoptionindicatesapossiblereasonthiscommanddidnotcausetheroutertoadvertisetheaggregatenetworktoitspeers?Selectthebestresponse.InterfaceNULL0islikelyTheBGPcommandnosynchronizationisTheBGPcommandnoauto-summaryisSubnetsof/22donotexistintheBGPTheIGPrunningonthisrouterdoesnothavenetwork/22ThenexthopIPaddressmustbealoopbackAnswer:Section:QUESTIONRefertothepartialconfigurationsintheexhibit.WhataddressisutilizedforDRandBDRidentificationonthebesttheserial1/1theserial2/0arandomlygeneratedinternaltheconfiguredrouter-idAnswer:Section:QUESTIONRefertotheexhibit.WhatisrequiredtocompletetheIPv6routingconfigurationsshown?SelectthebestInterfaceauthenticationmustbeTheroutingprocessesmustbeconfiguredwithanreaIPunicastroutingmustbeIPv4addressesmustbeappliedtotheAnswer:Section:QUESTIONRefertotheexhibit.RoutersR1andR2havebeenconfiguredtooperatewithOSPF.RoutersR1andR3havebeenconfiguredtooperatewithRIP.AfterconfiguringtheredistributionbetweenOSPFandRIPonR1,noOSPFroutesaredistributedintoRIP.Whatshouldbedonetocorrectthisproblem?SelectthebestTheredistributioncommandshouldbereenteredwiththematchroute-typparameterTheredistributioncommandshouldbereenteredwiththeroute-mapmaptagparameterTheredistributioncommandshouldbereenteredwiththemetricmetric-valueparameterRouteswillfirstneedtobedistributedintoanotherprotocol,andthenintoAnswer:Section:QUESTIONWhichtworoutingprotocolsrequireametrictobeconfiguredwhenredistributingroutesfromotherprotocols?(Choosetwo.)Select2IS-Answer:Section:QUESTIONBydefault,whichstatementiscorrectregardingtheredistributionofroutesfromotherroutingprotocolsintoSelectthebestTheywillappearintheOSPFroutingtableastypeE1TheywillappearintheOSPFroutingtableastypeE2SummarizedroutesarenotAllimportedrouteswillbeautomaticallysummarizedwhenOnlyrouteswithloweradministrativedistanceswillbeAnswer:Section:QUESTIONWhenimplementingOSPFv3,whichstatementdescribestheconfigurationofOSPFareas?SelectthebestIninterfaceconfigurationmode,theOSPFv3areaIDcombinationassignsierfcestoOSPFv3Inrouterconfigurationmode,thenetworkwildcardareaIDcombinationasignsnetworkstoOSPFv3Ininterfaceconfigurationmode,theIPv6OSPFprocessareaIDcmbinationassignsinterfacestoOSPFv3areas.Inrouterconfigurationmode,theIPv6OSPFinterfaceareaIcombinationassignsinterfacestoOSPFv3areas.Answer:Section:QUESTIONRefertotheexhibit.ItisdesiredtupaBGPneighborrelationshipbetweenroutersR1andR4.BGPpacketsbetweenthemcouldtravlthroughR2orR3.WhatisthesimplestconfigurationthatwillallowforSelectthebestConfigureBGPneighborrelationshipsbetweenallinterfceonR1andInstalladirectconnectionbetweenR1andConfigureloopbackinterfacesonR1andR4torovietheupdatesourceaddressforBGPConfigureonlyoneneighborrelationshipbetween1'sinterfaceandR4'sinterface.Answer:Section:题干中failover-备份QUESTIONRefertotheexhibit.Routingupdatesforthenetworkarebeingreceivedfromallthreeneighbors.Whichstatementiscorrectregardingtheresultoftheconfigurationshown?SelectthebestTherouterwillpreferthenexthopofforpacketsdestinedfortheTherouterwillpreferthenexthopofforpacketsdestinedfortheTherouterwilladvertisethenetworkonlytoTherouterwilladvertisethenetworkonlyt172TherouterwillpreferthenexthopoffopacketsexceptthosedestinedforAnswer:Section:如图所示对邻居 1过来的路由表项做一个进站的更新QUESTIONWhentroubleshootinganEIGRPconnectivityproblem,younoticethattwoconnectedEIGRProutersare ingEIGRPneighbors.Abetweenthetworouterswassuccessful.Whatisthenextthingthatshouldbechecked?Selectthebestresponse.Verifythatthe oandholdtimersmatchVerifythatEIGRPbroadcastpacketsarenotbeingdroppedbetweenthetworouterswiththeshowipEIGRPpeercommand.VerifythatEIGRPbroadcastpacketsarenotbeingdroppedbetweenthetworouterswiththeshowipEIGRPtrafficcommand.VerifythatEIGRPisenabledfortheappropriatenetworksonthelocalandneighboringAnswer:Section:QUESTIONRefertotheexhibit.OSPFisconfiguredonallroutersinthenetwork.Onthebasisoftheshowipospfneighboroutput,whatpreventsR1fromestablishingafulladjacencywithR2?SelectthebestRouterR1willonlyestablishfulladjacencywiththeDRndBDRonbroadcastmultiaccessRouterR2hasbeenelectedasaDRforthebroadcastmultiaccessnetworkinOSPFRoutersR1andR2areconfiguredasstubrouterforOSPFarea1andOSPFareaRouterR1andR2areconfiguredforavirualinkbetweenOSPFarea1andOSPFarea oparametersonroutersR1andR2onotAnswer:Section:基本定义，在OSPF广播型的路网络中，DR与BDR之间FULL关系，DR、BDR与DROTHER是FULLQUESTIONRefertotheexhibit.Onthebasisoftheconfigurationprovided,howarethe opacketssentbyR2handledbyR5inOSPFarea5?Selectthebest opacketswillbeexchangedandadjacencywillbestablishedbetweenroutersR2and opacketswillbeexchangedbuttheroutersR2andR5 eneighbors opacketswillbedroppedandno ywillbeestablishedbetweenroutersR2and opacketswillbedroppedbuttheoersR2andR5 eAnswer:Section:在R2上显示Area5是末节区域，而R5上没有配置Area5为末节区域。因为stub标记不匹配，那么 QUESTIONWhichstatementistrueaboutOSPFNetworkLSAs?Selectthebestresponse.TheyareoriginatedbyeveryrouterintheOPSFnetwork.Theyincludeallroutersonthelink,interfaces,thecostofthelink,andanyknownneighboronthelink.TheyareoriginatedbytheDRoneverymulti-accessnetwork.TheyincludeallattachedroutersincludingtheDRitself.TheyareoriginatedbyAreaBorderRoutersandaresentintoasingleareatoadvertisedestinationsoutsidethatarea.TheyareoriginatedbyAreaBorderRouterandaresentintoasingleareatoadvertiseanAutonomousSystemBorderRouter.Answer:Section:NetworkLSAs是类型2的LSA，是由DR产生的，只在多路中才会出现。用于描述它本身和它直连网络的QUESTIONRefertotheexhibit.Youarethenetworkadministratorofthe company.YouhavebeentaskedtoimplementahubandspokeEIGRPtopologyoverFrameRelaytoprovideconnectivitybetweenthenetworksatheadquartersandall300spokes.Beforeyoubegintheactualimplementation,whichthreepiecesofinformationaremoreimportanttoknowthantheothers?(Choosethree.)Select3theCommittedInformationRateofalltheFrameRelaytheCiscoIOSversionrunningonallthetheroutermodelnumberofallthespokethenumberofHQnetworksconnectedbehindtheheadquartertheroutingpolicy,suchaswhetherornotthespokescanbeusedasbackuptransientpointbetweenthetwoheadquarterroutersAnswer:Section:因为framerelay是一个多路复用技术，所以第一个要考虑是PVC上的CIR速率，然后要考虑的是边缘路由器不要作为两个HQ路由器的备份链路，即是将边缘路由器打上stub标记，如果要打stubQUESTIONRefertotheexhibit.The companyisrunningEIGRPbetweenalltherouters.Currently,ifoneoftheLANlinks(LAN1orLAN2)attheheadquartersflaps(goesupanddown),theHQ-RTR1andHQ-RTR2routerswillexperiencehighCPUusageandhavealongEIGRPconvergencetime.Asthenewnetworkadministrator,youareaskedtoinvestigatethissituationanddetermineifthereisaquickwaytoresolvethisissue.WhichisthemostimportantthingthatyoucanquicklyverifyfirsttoresolvethisSelectthebestVerifythatthebandwidthsettingonallWANlinksisVerifythattheHQ-RTR1andHQ-RTR2routersareconfiguredtosendonlyadefaultroutetoallthespokerouters.VerifythattheHQ-RTR1andHQ-RTR2routersareconfiguredforEIGRPNonstopVerifythatallthespokeroutersareconfiguredforVerifythatallthespokeroutersareconfiguredasEIGRPAnswer:Section:会容易产生Queryflood，从而导致EIGRP收敛速度变慢。所以，要避免产生Queryflood，故新IOS引入EIGRPstub技术。当spokeRouter配置为stub，就会的邻居(图上为HQ-RTR1和HQ-RTR2),Query发给我。于是就避免了Queryflood.QUESTIONRefertotheexhibit.WhenyouexaminetheroutingtableofR1andR4,youarenotabletoseetheR1EthernetsubnetontheR4routingtable.YouarealsonotabletoseetheR4EthernetsubnetontheR1routingtable.Whichconfigurationchangeshouldbemadetoresolvethisissue?Selecttherouterswheretheconfigurationchangewillberequired,andselecttherequiredEIGRPconfigurationcommand(s).(ChooseR1andR2andipsummary-addresseigrp110.1.10andipsummary-addresseigrpvarianceeigrpstubnoauto-Answer:Section:QUESTIONRefertotheexhibit.TheactualspeedoftheseriallinksbetweenR2andR3are256kb/sand512kb/srespectively.WhenconfiguringEIGRPonroutersR2andR3,thenetworkadministratorconfiguredthebandwidthofbothserialinterfacesto512kb/s.Whatwillbetheeffect?Selectthebestresponse.EIGRPwilloverutilizethe512kb/sTheinterface"delay"valueusedintheEIGRPmetriccalculationwillbeinacurteonthe256kb/sserialinterface.TheamountofbandwidthusedforEIGRProutingprotocoltrafficonthe256kb/slinkcan EIGRPcanloadbalancebetweenthetwoseriallinksonlyifthevrianceissetto2orUnequalcostloadbalancingwillbeAnswer:Section:如果将两个串行链路的带宽改为512kb/s，这两个串行链路会发生均衡负载，流量按1:1在链负载，这 QUESTIONRefertotheexhibit. ajustimplementedthisEIGRPnetwork.AnetworkadministratorcametoyouforadvicewhiletryingtimplementloadbalancingacrosspartoftheirEIGRPnetwork.Ifthevariancevalueisconfigredas2onallroutersandallothermetricandKvaluesareconfiguredtotheirdefaultvalues,trafficromtheInternettothedatacenterwillbeloadbalancedacrosshowmanySelectthebest12345Answer:Section:条数。如图所示，应该是ADEH和AFEH两条。minFD=30QUESTIONRefertotheexhibit.ABostoncompanyboughttheassetsofaNewYorkcompanyandistryingtoroutetrafficbetweenthetwodatanetworksusingEIGRP.Theshowcommandoutputshowsthattrafficwillnotflowbetweenthenetworks.Asanetworkconsultant,youwereaskedtomodifytheconfigurationandcertifytheinteroperabilityofthetwonetworks.Fortraffictoflowfromsubnet/24tothe/24subnet,whichconfigurationchangedoyou SelectthebestTurnoffautosummarizationonroutersN1andAddIPsummaryaddressestotheInternepntinginterfacesofroutersN1andTurnoffautosummarizationonroutersN2andAddwildcardmaskstothenetworkcommandsonroutersN2andAnswer:Section:QUESTIONRefertotheexhibit.ABostoncompanyboughttheassetsofaNewYorkcompanyandistryingtoroutetrafficbetweenthetwodatanetworksusingEIGRPoverEoMPLS.Asanetworkconsultant,youwereaskedtoverifytheinteroperabilityofthetwonetworks.Fromtheshowiproutecommandoutput,whatcanyou lthecustomeraboutthetrafficflowbetweenthesubnetinNewYork(/24)andthesubnetsinBoston(/24and/24)?SelectthebestTrafficisflowingbetweenthe172.18 subnetandsubnetsandandnoconfigurationchangesareneedd.Auto-summarymustbedisabednN1andB1beforetrafficcanflowbetweenthesubnetandsubnetsand.Trafficwillflowbetweethesubnetandwithoutanyfurtherconfigurationchanges.However,ut-summarymustbedisabledonN1andB1beforetrafficcanflowbetweenthesubnetandtheAuto-summarymustbedisabledonN1andB1beforetrafficcanflowbetweenthesubnetandthesubnet.However,trafficwillflowbetweenthesubnetandwithoutanyfurtherconfigurationchanges.Answer:Section:QUESTIONRefertotheexhibit.YouarethenetworkadministratorresponsiblefortheNProuter,therouter,andtherouter.WhatcanyoudetermineabouttheOSPFoperationsfromthedebugoutput?SelectthebestTheNProuterhastwoOSPFneighborsinthe"Full"adjacencyTheNProuterserial0/0interfacehastheOSPFdeadtimersetto10scoTheNProuterserial0/0interfacehasbeenconfiguredwithanOSPFnetworktypeof"point-to-TheandroutersarenotusingthedefaultOSPFdead otimersThe"Mismatched"erroriscausedbytheexpirationoftheOSPFAnswer:Section:o包的deadtime和本地的deadtime不一样。 oparametsfom deadR120C oR30C30-recive的deadtime是120s，本地的deadtime是QUESTIONYouhavejustcompletedOSPFimplementation.Whileexecutingyourverificationplan,youdeterminethatR1isnotabletoestbshfullOSPFadjacencywithR2.TheshowipospfneighborcommandoutputonR1showsthatR2isstuckintheINITstate.Whatcouldbethecauseofthisproblem?Selectthebestresponse.DRandBDRelectionerrorsbetweenR1andTheR2routerhasnotreceivedthe opacketsfromtheR1Mismatched umtransmissionunit(MTU)configurationbetweentheR1andMismatched ointervalconfigurationbetweentheR1andCorruptedLSAsexchangesbetweentheR1andAnswer:Section:基本定义，R1和R2一直停留在INIT状态，这是R1发送了o包，R2没有回应的原因，答案是QUESTIONRefertotheexhibit.YouhavecompletedanOSPFimplementation,andyouareverifyingOSPFoperation.YounoticethatrouterAandrouterBarestuckinthetwo-waystate.Fromtheshowipospfinterfacecommandoutput,whatisthecauseofthisissue?SelectthebestAllOSPFimplementtinsmusthaveatleastoneinterfaceinareaYouareattemptingtoruninthebroadcastmodeoveranNBMABothroutersareconfiguredtofunctionasaBDR;therefore,thereisnoDRSomeonehaschangedtheOSPFrouterID;thereforeyoumustcleartheOSPFTheOSPFpriorityissetto0onbothrouters;thereforeneither etheAnswer:Section:QUESTIONYouhavecompletedanOSPFimplementation,andyouareverifyingOSPFoperation.Duringthisverification,younoticethattheOSPFrouteofisrepeatedlyappearinganddisappearingfromtheroutingtable.FurtherinvestigationfindsthattheOSPFCPUutilizationisveryhighandtheroutersconstantlyperformingSPFcalculations.Youdeterminethatisthesourceoftheroute.Usingtheshowipospfdatabaseroutercommand,younoticethatwhenthisshowcommandisperformedrepeatedly,thecontentsoftheLSAchangeeveryfewseconds.Whatcouldbethecauseofthisproblem?Selectthebestresponse.OSPFauthenticationerrorsbetweensomeoftheTworoutershavethesameOSPFrouterIssueswithmistunedOSPFOSPFLSApacingissuesbetweensomeoftheOSPFneighboradjacencyproblemsbetweensomeoftheAnswer:Section:QUESTIONWhenanOSPFdesignisplanned,whichimplementationcanhelparournothavememoryresourceSelectthebestHaveabackbonearea(area0)with40routersandusedeautroutestoreachexternalHaveabackbonearea(area0)with4routersand30,000xternalroutesinjectedintoHavelessOSPFareastoreducetheneedforinteraearouteHavemultipleOSPFprocessesoneachOSPFroter.Example,routerospf1,routerospfAnswer:Section:相比答案A、B、C、D，消耗内存资源最小的当然是答案AQUESTION umnumberofroutersperOSPFareatypicallydependsonwhichthreefactors?(Choosethree.)Select3response(s).thekindofOSPFareasbeingthenumberofexternalLSAsinthethenumberofDRsandBDRsinthethenumberofvirtuallinksinthehowwelltheareascanbetheuseofLSAAnswer:Section:QUESTIONYouaretroubleshootinganOSPFproblemwhereexternalroutesarenotshowingupintheOSPFWhichtwooptionsarevalidchecksthatshouldbeperformedfirsttoverifyproperOSPFoperation?(Choosetwo.)Select2AretheASBRstryingtoredistributetheexternalroutesintoatotallystubbyAretheABRsconfiguredwithstubbyIsthesubnetskeywordbeingusedwiththeredistributionIsbackbonearea(area0)IstheCPUutilizationoftheroutersAnswer:Section:Totallystubbyarea中只允许1、2类LSA的存在，所以Totallystubbyarea是不能重分布进外部路由的，A正QUESTIONWhenverifyingtheOSPFlinkstatedatabase,whichtypeofLS shouldyouexpecttoseewithinthedifferentOSPFareatypes?(Choosethree.)Select3response(s)AllOSPFroutersinstubbyareascanhavetype3LSAsintheirAllOSPFroutersinstubbyareascanhave LSAsintheirAllOSPFroutersintotallystubbyareascahavetype3LSAsintheirAllOSPFroutersintotallystubbyareas hvetype7LSAsintheirAllOSPFroutersinNSSAareascanhavetype3LSAsintheirAllOSPFroutersinNSSAareascahvetype7LSAsintheirAnswer:Section:StubLSA1,2,3NSSA<-LSABackboneortransit<-LSATotallystubby：LSA1,LSA2,一条LSA3(defaultroute)TotallyNSSA<-LSA1,2,7QUESTIONWhenverifyingOSPFvirtuallinkproblems,whichisanimportantitemtocheckonthetwotransitOSPFSelectthebestOSPFprocessOSPFrouterOSPFnetworkOSPFmemoryOSPFCPUOSPFstubareaAnswer:Section:QUESTIONYouaredeveloaverificationplanforan ingOSPFimplementation.Partofthisplanistoverifythestatusoftype3LSAswithinthenetwork.Whichroutersshouldyouverifyfirsttoensurethattheconfigurationsarecorrectforgeneratingtype3LSAs?SelectthebestInternalrouterswithinthebackbonearea(areaInternalrouterswithintheInternalrouterswithinthestubbyDRsandAnswer:Section:基本概念，只有ABRs才能产生3类LSA，所以查看也在QUESTIONWhichconditionmustbesatisfiedbeforeanEGPneighborcanbeconsideredafeasiblesuccessor?Selectthebestresponse.Theneighbor'sadvertiseddistance utbelessthanorequaltothefeasibledistanceofthecurrentTheneighbor'sadvertiseddistanemustbelessthanthefeasibledistanceofthecurrentTheneighbor's sncemustbegreaterthanthefeasibledistanceofthecurrentTheneighbor'sadvertieddistancemustbeequaltothefeasibledistanceofthecurrentTheneighbor'sadveisddistancemustbegreaterthanorequaltothefeasibledistanceofthecurrentAnswer:Section:QUESTIONBasedontheneedtolimitprocessingandbandwidthutilizationduetodynamicroutingprotocoloperation,thefollowingroutingrequirementshavebeenspecifiedforyournetwork. putationonlyoccursforroutesthatwereaffectedWhichdynamicroutingprotocolshouldbedeployedinyournetworktobestmeettheserequirements?SelectthebestIS-Answer:Section:partialandincrementalroutingupdates-onlythedevicesaffectedbyatopologychangeperformroute QUESTIONWhichstatementaboutanon-zerovaluefortheloadmetric(k2)forEIGRPiste?SelectthebestAchangeintheloadonaninterfacewillcauseEIGRPtorecalculate eoutingmetricsandsendacorrespondingupdateouttoeachofitsneighbors.EIGRPcalculatesinterfaceloadasa5-minuteexponentiallyweightedaveragethatisupdatedevery5EIGRPconsiderstheloadofaninterfaceonlywhen inganupdateforsomeotherAchangeintheloadonaninterfacewillcauseEIGRPtorecalculateandupdatetheadministrativedistanceforallrouteslearnedonthatinterfaceAnswer:Section:QUESTIONYournetworkconsistsofalargehub-and-spokeFrameRelaynetworkwithaCIRof56kb/sforeachWhichstatementabouttheselectionofadynamicprotocolistrue?SelectthebestEIGRPwouldbeappropriateifLMItypeANSIisNOTEIGRPwouldbeappropriate,becausetheFrameRelayspokescouldbesegmentedintotheirownEIGRPwouldbeappropriate,becausebydefault,queriesarenotpropagatedacrosstheslowspeedFrameRelaylinks.EIGRPwouldbeappropriate,becauseyoucanmanagehowmuchbandwidthisconsumedovertheFrameRelayinterface.Answer:Section:这题考的是动态路由协议在帧中继中的部署。Framerelay是一个多路复用技术，所以要考虑协议占用接口带宽的一个，如题还要考虑拓扑是一个星型的结构，在这种情况下EIGRP是一个首选，它能对协议占用接QUESTIONWhenanEIGRPtopologychangeisdetected,whatisthecorrectorderofeventswhenthereisaFS?Selectthebestresponse.Theneighboradjacencyisdeleted.Thefeasiblerouteisused.DUALisRemovealltopologyentrieslearned