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首页 CCNP.642-902.题库V200完美版

CCNP.642-902.题库V200完美版.pdf

CCNP.642-902.题库V200完美版

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2012-06-11 0人阅读 举报 0 0 暂无简介

简介:本文档为《CCNP.642-902.题库V200完美版pdf》,可适用于考试题库领域

ExamAQUESTIONRefertotheexhibitWhichstatementistrueSelectthebestresponseARouterRARwillacceptonlyroutefromitsBGPneighborBRouterRARwillsendonlyroutetoitsBGPneighborCOnlytrafficwithadestinationfromwillbepermittedDOnlytrafficgoingtowillbepermittedAnswer:ASection:RedistribuzioneExplanationReference:考点:policydistributelist用distributelist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影响邻居路由器图中访问控制列表中反演码是为了匹配网络号和子网掩码注意是精确匹配是任意匹配就是位也就是位所以是permitQUESTIONRefertotheexhibitWhichthreestatementsaccuratelydescribetheresultofapplyingtheexhibitedroutemap(Choosethree)Selectresponse(s)wwwlabcomAThemapprohibitstheredistributionofalltypeexternalOSPFrouteswithtagsetBThemapprohibitstheredistributionofalltypeexternalOSPFroutesCThemapredistributesintoEIGRPallroutesthatmatchthepfxprefixlistandthefivemetricvalues,,,,andDThemapprohibitstheredistributionofallexternalOSPFrouteswithtagsetEAllroutesthatdonomatchclausesandoftheroutemapareredistributedwiththeirtagssettoFThemappermitstheredistributionofalltypeexternalOSPFroutesAnswer:AEFSection:RedistribuzioneExplanationReference:考点:policyroutemap用routemap对从ospf重分布进来的路由表项进行过滤。同一个routemap子项中多个match是与的关系而不同routemap子项间是或的关系。过滤掉了type那么就剩下type能过。图中禁止有tagE类型的OSPF重分发允许所有的E类型路由把其他未过滤掉的路由打上Tag标记QUESTIONRefertotheexhibitEIGRPhasbeenconfiguredonallroutersinthenetworkWhatadditionalconfigurationstatementshouldbeincludedonrouterRtoadvertiseadefaultroutetoitsneighborswwwlabcomSelectthebestresponseAR(config)#ipdefaultnetworkBR(config)#iprouteCR(config)#iprouteDR(configrouter)#defaultinformationoriginateAnswer:ASection:EIGRPExplanationReference:考点:EIGRPEIGRP在宣告默认路由是使用ipdefaultnetworkQUESTIONIntowhichtwotypesofareaswouldanareaborderrouter(ABR)injectadefaultroute(Choosetwo)Selectresponse(s)Atheautonomoussystemofadifferentinteriorgatewayprotocol(IGP)BareaCtotallystubbyDNSSAEstubFtheautonomoussystemofanexteriorgatewayprotocol(EGP)Answer:CESection:OSPFExplanationReference:考点:OSPF的特殊区域哪两种类型区域让ABR宣告一条默认路由当然是stub区域和totallystubby区域。注意NSSA区域中宣告默认路由的路由器既是ABR又是ASBR。QUESTIONWhichthreerestrictionsapplytoOSPFstubareas(Choosethree)Selectresponse(s)ANovirtuallinksareallowedBTheareacannotbeabackboneareaCRedistributionisnotallowedunlessthepacketischangedtoatypepacketwwwlabcomDTheareahasnomorethanroutersENoautonomoussystemborderroutersareallowedFInterarearoutesaresuppressedAnswer:ABESection:OSPFExplanationReference:考点:OSPF的特殊区域因为OSPF的末节区域只连接一个区域所以它是不可能成为骨干区域和建立虚电路的。ASBR只能出现在特殊区域NSSA中不能出现在stubarea原因是stubarea不能引入外部路由。QUESTIONWhatarethetworeasonsfortheappearanceofasthenexthopforanetworkintheshowipbgpcommandoutput(Choosetwo)Selectresponse(s)AThenetworkwasoriginatedviaredistributionofaninteriorgatewayprotocolintoBGPBThenetworkwasdefinedbyastaticrouteCThenetworkwasoriginatedviaanetworkoraggregatecommandDThenetworkwaslearnedviaEBGPEThenetworkwaslearnedviaIBGPAnswer:ACSection:BGPExplanationReference:考点:BGP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命令使用聚合aggregate命令。QUESTIONRefertotheexhibitWhichtwostatementsaretrueaboutthepartialconfigurationthatisprovided(Choosetwo)Selectresponse(s)AAlltheconfiguredneighborsareinautonomoussystemBThepeergroupshortenstheIBGPconfigurationCThepeergroupshortenstheEBGPconfigurationDOnlytheoutgoingfiltersareappliedtoBGPupdateswwwlabcomEThreeASpathfiltersareappliedtoeachBGPneighborAnswer:ABSection:BGPExplanationReference:考点:BGP图中定义了一个internal即IBGP对等体组并且将整个对等体组定义为AS。并将三个路由器加入对等体组中。QUESTIONRefertotheexhibitWhichtwostatementsarecorrect(Choosetwo)Selectresponse(s)AAllsixrouteswillbeinstalledintheroutingtableBTworouteswillbeinstalledintheroutingtableCFourrouteswillbeinstalledintheroutingtableDAlltherouteswereredistributedintoBGPfromanIGPEAlltherouteswereoriginatedbyBGPwiththenetworkcommandAnswer:CDSection:BGPExplanationReference:考点:BGP>best表示是最优路径所以有条路由加入路由表中?incomplete表示从IGP重分布到EGP中的路由所以是六条E选项:如果用network命令最后path值应该显示为iQUESTIONWhataretworulesforcompactingIPvaddresses(Choosetwo)Selectresponse(s)AThemaximumnumberoftimesadoublecoloncanreplaceabitsegmentthatconsistsofallzeroesistwoBTheleadingzeroesinanybitsegmentdonothavetobewrittenCEverybitsegmentthatconsistsofallzeroescanberepresentedwithasinglecolonDThetrailingzeroesinanybitsegmentdonothavetobewrittenEAnysingle,continuousstringofoneormorebitsegmentsthatconsistsofallzeroescanberepresentedwithadoublecolonFTwozeroesinthemiddleofanybitsegmentdonothavetobewrittenwwwlabcomAnswer:BESection:IPvExplanationReference:考点:ipv的缩写这道题考的是ipv定义:每个位组开始的可以省略任意多个为的位组可以用::表示但是一个ipv的地址中只允许出现一次::QUESTIONWhatisthedifferencebetweentheIPvaddresses::and::SelectthebestresponseA::istheunspecifiedaddress,and::isthemulticastaddressB::istheunicastaddress,and::istheanycastaddressC::istheunicastaddress,and::isthemulticastaddressD::istheanycastaddress,and::isthemulticastaddressE::isthedefaultroute,and::istheunspecifiedaddressF::istheanycastaddress,and::isthedefaultaddressAnswer:ESection:IPvExplanationReference:考点:ipv(特殊的ipv地址)书中定义的::表示默认路由::表示非特定地址QUESTIONRefertotheoutputWhatIOScommandproducesthisoutputSelectthebestresponseAshowipospfBshowipospfinterfaceCshowipvospfinterfaceDshowipvospfwwwlabcomAnswer:DSection:IPvExplanationReference:考点:ipvospfv是专门为ipv设计的然后第一行又是出现的进程信息所以是命令是showipvospf大家可以敲一遍命令研究研究。如图所示首行是进程信息QUESTIONRefertotheexhibitRouterRTAisthehubrouterforroutersRTBandRTCTheFrameRelaynetworkisconfiguredwithEIGRP,andtheentirenetworkisinautonomoussystemHowever,routerRTBandRTCarenotreceivingeachother'sroutesWhatisthesolutionSelectthebestresponseAConfiguretheautosummarycommandunderroutereigrponrouterRTABIssuethenoipsplithorizoncommandonrouterRTACConfiguresubinterfacesonthespokeroutersandassigndifferentIPaddresssubnetsforeachsubinterfaceDCheckandchangetheaccesslistsonrouterRTAEIssuethenoipsplithorizoneigrpcommandonrouterRTAFConfigureadistributelistonrouterRTAthatallowsittoadvertiseallroutestothespokeroutersAnswer:ESection:EIGRPExplanationReference:考点:EIGRP在帧中继中实现的问题framerelay是一个多路复用技术图中RTB将自己的路由宣告给路由器RTA的s口因为水平分割的原因RTA不会将RTB的路由再从s宣告出去这样RTC将不会得到RTB的路由所以只要关闭RTA水平分wwwlabcom割路由才会接收正常。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因为水平分割而导致边缘路由器之间得不到互相的路由更新。水平分割:在一个接口上得到的路由更新不会从这个接口再宣告出去。QUESTIONArouterhastwopathstoreachanothernetworkinadifferentautonomoussystemNeitherroutewasgeneratedbythelocalrouterandbothrouteshavethesamedefaultweightandlocalpreferencevaluesWhichstatementistrueabouthowBGPwouldselectthebestpathSelectthebestresponseAIfthecommandbgpalwayscomparemedhasbeengiven,thentherouterwillprefertheroutewiththehighestMEDBTherouterwillprefertheroutewiththelowerMEDCTherouterwillprefertheshortestautonomoussystempathDToinfluenceoneroutetobepreferred,itsdefaultlocalpreferencevaluewillbechangedviatheuseofthecommandbgpdefaultlocalpreferenceAnswer:CSection:BGPExplanationReference:考点:BGP的选路策略即是一个更新通过多个BGP对等体学到的时候它的选路策略问题。BGP选路原则:权本始短起M权:weight本:localpref,默认为始:自己通告的即nexthop为短:最短aspath起:Origin,优先级:i>e>M:MED最小MEDCISCO为metric步:lowestRID如题干描述所示bothrouteshavethesamedefaultweightandlocalpreferencevalues:weight和localpre的值都相等QUESTIONRefertotheexhibitOnthebasisoftheinformationintheexhibit,whichtwostatementsaretrue(Choosetwo)wwwlabcomSelectresponse(s)ATheoutputwasgeneratedbyenteringtheshowipbgpcommandontheISProuterBTheoutputwasgeneratedbyenteringtheshowipbgpcommandontheSanJoserouterCTheserialinterfaceontheISProuterhasbeenconfiguredwiththesetmetriccommandDTheserialinterfaceontheISProuterhasbeenconfiguredwiththesetmetriccommandEWhentrafficissentfromtheISPtoautonomoussystem,thetrafficwillbeforwardedtoSanJosebecauseofthelowerMEDvalueofSanJoseFWhentrafficissentfromtheISPtoautonomoussystem,thetrafficwillbeforwardedtoSanJosebecauseofthehigherMEDvalueofSanJoseAnswer:AESection:RedistribuzioneExplanationReference:考点:BGPMED值的问题因为网段的下一条跳这代表这条路由是本地产生的而这条路由是ISProuter的直连路由所以上图是ISP上运行的showipbgp产生的A正确。根据BGP路由选路原理其他路由器宣告过来的路由所带的MED越低此路由器就会选择该路由E正确。如图所示除了MED其他的属性都一样QUESTIONRefertotheexhibitOnthebasisoftheconfigurationthatisprovided,howwouldtheBGPupdatesthatcomefromrouterRbereplicatedinsideautonomoussystemwwwlabcomSelectthebestresponseAAllBGPupdatesthatarereceivedonrouterRwillbesenttoroutersRandRRoutersRandRwillthenforwardthoseBGPupdatestorouterRBAllBGPupdatesthatarereceivedonrouterRwillnotbesenttoroutersRandRCAllBGPupdatesthatarereceivedonrouterRwillbesentdirectlytorouterRDNoneoftheBGPupdatesthatarereceivedonrouterRwilleverbereceivedbyrouterRAnswer:DSection:BGPExplanationReference:考点:BGP因为R没有与R建立BGP对等体关系所以R不会与R发生TCP对话即RR之间没有BGP更新交互D正确。QUESTIONHowisauthenticationhandledwithOSPFvSelectthebestresponseAOSPFvforIPvauthenticationissupportedbySHAauthenticationBOSPFvforIPvauthenticationissupportedbyMDauthenticationCOSPFvforIPvauthenticationissupportedbyIPvIPsecDOSPFvforIPvauthenticationissupportedbyIPvIPsecAnswer:CSection:IPvwwwlabcomExplanationReference:考点:ipvOSPFv的认证方式OSPFv的包头没有authenticationtype和key字段它是通过IPvIPsec来实现认证的IPvIPsec更安全。QUESTIONRefertotheexhibitRouterRTchoosesonepathtonetworkIndicatethereasonRouterRTchoosesthis"best"pathSelectthebestresponseAInmakingitsdecisionaboutthebestpath,RTgivesprecedencetotheorigincodeBInmakingitsdecisionaboutthebestpath,RTgivesprecedencetotheBGPMEDvaluesCIPaddressislowerthanDInmakingitsdecisionaboutthebestpath,RTpreferstheIGPmetricsERTprefersinternalBGProutesFIPaddressislowerthanAnswer:ASection:BGPExplanationReference:考点:BGP的选路策略选路过程(按比较的先后顺序):Weight(Biggerisbetter)Localpreference(Biggerisbetter)Selforiginated(LocallyinjectedisbetterthaniBGPeBGPlearned)ASPath(Smallerisbetter)Origin(PreferORIGINcodeIoverE,andEover)MED(Smallerisbetter)QUESTIONRefertotheexhibitRouterRTandrouterRTbothadvertisenetworktorouterRTviainternalBGPWhatisthereasonthatrouterRTchoserouterRTasitsbestpathtonetworkwwwlabcomSelectthebestresponseAItadvertisesthebestASpathBItadvertisesthebestorigincodeCItadvertisesthebestMEDDItadvertisesthebestlocalpreferenceEIthasabetterrouterIDFItadvertisesalowerautonomoussystemAnswer:ESection:BGPExplanationReference:考点:BGP的选路策略BGP选路原则:权本始短起M权:weight本:localpref,默认为始:自己通告的即nexthop为短:最短aspath起:Origin,优先级:i>e>M:MED最小MEDCISCO为metric步:lowestRID注意图片描述:wwwlabcomQUESTIONUsingtherulesforIPvaddressing,howcantheaddress::F:::C:A:BberewrittenSelectthebestresponseA::F::C:A:BB::F::C:A:BC::F:C::A:BD::F:::C:A:BAnswer:ASection:IPvExplanationReference:考点:ipv的缩写这道题考的是定义:每个位组开始的可以省略任意多个为的位组可以用::表示但是一个ipv的地址中只允许出现一次::QUESTIONWhattwosituationscouldrequiretheuseofmultipleroutingprotocols(Choosetwo)Selectresponse(s)AwhenusingUNIXhostbasedroutersBwhensmallerbroadcastdomainsaredesiredCbecausehavingmultipleroutingprotocolsconfuseshackersDwhenmigratingfromanolderInteriorGatewayProtocol(IGP)toanewIGPEwhenallequipmentismanufacturedbyCiscoFwhentherearemultiplepathstodestinationnetworksAnswer:ADSection:RoutingExplanationReference:考点:多路由协议的运用这题属于定义A、D正确。使用UNIX主机作为路由器做旧的IGP协议向新的IGP协议的迁移。QUESTIONDuringBGPconfigurationonarouterthathaspeeredwithotherBGPspeakers,theBGPcommandaggregateaddressisissuedHowever,thepeersdonotreceivethisaggregatenetworkinBGPadvertisementsAlso,therouterdoesnothavethisaggregatenetworkinitsBGPtableWhichoptionindicatesapossiblereasonthiscommanddidnotcausetheroutertoadvertisetheaggregatenetworktoitspeersSelectthebestresponseAInterfaceislikelyshutdownBTheBGPcommandnosynchronizationismissingCTheBGPcommandnoautosummaryismissingDSubnetsofdonotexistintheBGPtableETheIGPrunningonthisrouterdoesnothavenetworkinstalledFThenexthopIPaddressmustbealoopbackaddressAnswer:DSection:BGPExplanationReference:考点:BGP路由聚合aggregate命令在BGP中用aggregate命令做路由聚合时明细子网必须有一条是up的否则命令是不起作用的。wwwlabcomQUESTIONRefertothepartialconfigurationsintheexhibitWhataddressisutilizedforDRandBDRidentificationonRouterSelectthebestresponseAtheserialaddressBtheserialaddressCarandomlygeneratedinternaladdressDtheconfiguredrouteridaddressAnswer:DSection:OSPFExplanationReference:考点:ipvOSPFv是使用ipv的地址作为RID在配置OSPFv必须要指定他的RID所以DR和BDR的标识符是使用手动指定的ipv地址作为RID。QUESTIONRefertotheexhibitWhatisrequiredtocompletetheIPvroutingconfigurationsshownSelectthebestresponsewwwlabcomAInterfaceauthenticationmustbeconfiguredBTheroutingprocessesmustbeconfiguredwithanareaIDCIPunicastroutingmustbeenabledDIPvaddressesmustbeappliedtotheinterfacesAnswer:CSection:IPvExplanationReference:考点:ipv图中就差ipvunicastrouting必须开启即是全局启用ipv路由QUESTIONRefertotheexhibitRoutersRandRhavebeenconfiguredtooperatewithOSPFRoutersRandRhavebeenconfiguredtooperatewithRIPAfterconfiguringtheredistributionbetweenOSPFandRIPonR,noOSPFroutesaredistributedintoRIPWhatshouldbedonetocorrectthisproblemwwwlabcomSelectthebestresponseATheredistributioncommandshouldbereenteredwiththematchroutetypeparameterincludedBTheredistributioncommandshouldbereenteredwiththeroutemapmaptagparameterincludedCTheredistributioncommandshouldbereenteredwiththemetricmetricvalueparameterincludedDRouteswillfirstneedtobedistributedintoanotherprotocol,andthenintoRIPAnswer:CSection:RedistribuzioneExplanationReference:考点:路由的重分布当OSPF路由重分布进入RIP的时候必须手动配置Metric因为重分布时默认的Metric是无穷大因此路由永远不会选入路由表中。所以要重新输入Metric字段。QUESTIONWhichtworoutingprotocolsrequireametrictobeconfiguredwhenredistributingroutesfromotherprotocols(Choosetwo)Selectresponse(s)ARIPBOSPFCEIGRPDISISEBGPAnswer:ACSection:RoutingExplanationReference:考点:路由的重分布当其他协议的路由重分布进入RIP和EIGRP的时候必须手动配置Metric因为重分布时默认的Metric是无穷大因此路由永远不会选入路由表中。所以要重新输入Metric字段。QUESTIONBydefault,whichstatementiscorrectregardingtheredistributionofroutesfromotherroutingprotocolsintoOSPFSelectthebestresponsewwwlabcomATheywillappearintheOSPFroutingtableastypeEroutesBTheywillappearintheOSPFroutingtableastypeEroutesCSummarizedroutesarenotacceptedDAllimportedrouteswillbeautomaticallysummarizedwhenpossibleEOnlyrouteswithloweradministrativedistanceswillbeimportedAnswer:BSection:OSPFExplanationReference:考点:路由的重分布基本定义其他协议的路由重分布进入OSPF中会默认显示为typeE路由。QUESTIONWhenimplementingOSPFv,whichstatementdescribestheconfigurationofOSPFareasSelectthebestresponseAIninterfaceconfigurationmode,theOSPFvareaIDcombinationassignsinterfacestoOSPFvareasBInrouterconfigurationmode,thenetworkwildcardareaIDcombinationassignsnetworkstoOSPFvareasCIninterfaceconfigurationmode,theIPvOSPFprocessareaIDcombinationassignsinterfacestoOSPFvareasDInrouterconfigurationmode,theIPvOSPFinterfaceareaIDcombinationassignsinterfacestoOSPFvareasAnswer:CSection:IPvExplanationReference:考点:ipv基本定义OSPFv区域和进程号的配置是在接口配置模式下进行的。QUESTIONRefertotheexhibitItisdesiredtosetupaBGPneighborrelationshipbetweenroutersRandRBGPpacketsbetweenthemcouldtravelthroughRorRWhatisthesimplestconfigurationthatwillallowforfailoverSelectthebestresponsewwwlabcomAConfigureBGPneighborrelationshipsbetweenallinterfacesonRandRBInstalladirectconnectionbetweenRandRCConfigureloopbackinterfacesonRandRtoprovidetheupdatesourceaddressforBGPpacketsDConfigureonlyoneneighborrelationshipbetweenR'sinterfaceandR'sinterfaceAnswer:CSection:BGPExplanationReference:考点:BGP图中是一个IBGP的对等体如果用回环口做IBGP对等体邻居关系的连接当物理接口down掉了通过IBGP对链路的重新收敛可以保证BGP会话的稳定。题干中failover备份QUESTIONRefertotheexhibitRoutingupdatesforthenetworkarebeingreceivedfromallthreeneighborsWhichstatementiscorrectregardingtheresultoftheconfigurationshownwwwlabcomSelectthebestresponseATherouterwillpreferthenexthopofforpacketsdestinedforthenetworkBTherouterwillpreferthenexthopofforpacketsdestinedforthenetworkCTherouterwilladvertisethenetworkonlytoDTherouterwilladvertisethenetworkonlytoETherouterwillpreferthenexthopofforpacketsexceptthosedestinedfortheAnswer:BSection:BGPExplanationReference:考点:BGP选路问题如图所示把来自的前缀给他一个的本地优先级因为优先级高了所以路由就会优先选择去往目的地的下一条为如图所示对邻居宣告过来的路由表项做一个进站的更新。Q

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