Cisco642611最新题库.docx
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Cisco642611最新题库.docx
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Cisco642611最新题库
642-611MPLS-ImplementingCiscoMPLSExam
Number:
642-611
ExamA
QUESTION1
WhichIOScommandshouldyouusetolistroutersinanLSR'sadjacencytable?
A.
showtagtdpnei
B.
showtagtdpadj
C.
showtagtdpsum
D.
showtagtdpdetail
Answer:
A
Section:
(none)
Explanation/Reference:
Explanation:
TheTDPneighborsandthestatusofindividualTDPsessionsalsocanbemonitoredwiththeshowtagtdpneighborcommand.ThecommanddisplaystheTDPidentifiersofthelocalandremoterouters,theIPaddressesandtheTCPportnumbersbetweentheTDPconnectionisestablished,theconnectionuptimeandtheinterfacesthroughwhichtheTDPneighborwasdiscovered,aswellasalltheinterfaceIPaddressesusedbytheTDPneighbor.
Reference:
MPLSandVPNArchitectures(Ciscopress)page33
QUESTION2
TheVPNcalledmy_vpnisoperatingoninterfaces0/0ofaPE-router.TheCE-PEroutingprotocolisRIP.TheMPLSbackboneIGPisOSPF.HowcouldyouverifythattheroutesreceivedfromtheremoteCE-routerarebeingredistributedintoRIP?
A.
VerifytheroutingtableinthelocalCE-router.
B.
UsetheshowipcefvrfcommandonthelocalPE-routerandverifytheadjacencytableintheCEFcache.
C.
UsethedebugiproutingcommandinthelocalPE-routerandverifywhichroutesareadvertisedtothelocalCE-router.
D.
UsetheshowiproutingadvertisedcommandonthelocalPE-routerandverifythattheroutesarebeingadvertisedtotheCE-router.
Answer:
A
Section:
(none)
Explanation/Reference:
Explanation:
"showipcefvrfXXX"onlyshowstablesonthePErouterbeforeredistribution
QUESTION3
WhichIOSshowcommandcanbeusedtoexaminealltheroutesthathavebeenredistributedintoMP-BGP?
A.
showipbgpvpnv4all
B.
showipbgp
C.
showiproutevrfname
D.
showipprotocolvrfname
E.
showiproutebgp
F.
showipbgpsum
Answer:
A
Section:
(none)
Explanation/Reference:
QUESTION4
TheVPNnamedmy_vpnisoperatingoninterfaces0/0ofaPE-router.TheCE-PEroutingprotocolisBGP.TheMPLSbackboneIGPisOSPF.HowshouldyouverityroutinginformationisbeingexchangedbetweenthePE-routersthatsupportthisVPN?
A.
OnthelocalPE-router,youusetheshowipcefvrfcommandandverifythatthereisalabelfortheremotePE-router'snext-hop.
B.
OnthelocalPE-router,youusetheshowipbgpsummarycommandandverifythattheBGPsessiontotheremoterPE-routeisup.
C.
OnthelocalPE-router,youusetheshowipbgpvpn4commandandverifythatroutesfromtheremotePE-routerhavebeenreceived.
D.
FromtheCE-router,youusethepintvrfcommandtopingtheremoteCE-router.IftheCE-routerscannotpingeachother,thenthePE-routersarenotexchangingroutinginformation.
Answer:
C
Section:
(none)
Explanation/Reference:
Explanation:
TodisplayVPNaddressinformationfromtheBGPtabl,usetheshowipbgpvpnv4commandinEXECmode.
QUESTION5
WhatisthepurposeoftheDownbitinanOSPFLSAheader?
A.
TheDownbitisusedtopreventredistributionloopsbetweenMP-BGPandOSPF.
B.
TheDownbitisusedtoindicatetheroutethatisbeingadvertisedhasbecomeunavailable.
C.
TheDownbitisusedtoindicateaninterfacehasbeenshutdownorbecomeunavailable.
D.
TheDownbitisusedtoindicatetheroutethatisbeingadvertisediscomingfromanareathatislowerinthehierarchicalmodel.
Answer:
A
Section:
(none)
Explanation/Reference:
QUESTION6
Exhibit:
***MISSING***
WhatistheinteractionbetweentheroutersinArea2andthesuper-backbone?
A.
TheOSPFsuper-backboneiscompletelytransparenttoOSPFArea2.
B.
Thesuper-backboneappearsasaBGPdomaintotheroutersinOSPFArea2.
C.
Thesuper-backboneappearsasanotherOSPFareatotheroutersinOSPFArea2.
D.
Thesuper-backboneappearsasanotherOSPFdomaintotheroutersinOSPFArea2.
Answer:
Section:
(none)
Explanation/Reference:
Explanation:
Pending,duetomissingexhibit.
QUESTION7
HowareroutingprotocolcontextimplementedinOSPF?
A.
EachroutingcontextisimplementedbyredistributingintoMBGP.
B.
Eachroutingcontextisimplementedbyassigningittoaninterface.
C.
Eachroutingcontextisimplementedasaseparateroutingprocess.
D.
Eachroutingcontextisimplementedasaseparateisolatedinstanceofthesameroutingprotocol.
Answer:
C
Section:
(none)
Explanation/Reference:
Explanation:
Accordingtothe"ImplementingCiscoMPLS"StudentGuide(TextPartNumber:
97-1154-01)Volume2,version1.0,page8-6.
-Routingcontext=routingprotocolruninonevrf
-RoutingcontextswereintroducedinCiscoIOSsoftwaretosupporttheneedforseparateisolatedcopiesofVPNroutingprotocols.Theycanbeimplementedasseparateroutingprocesses(OSPF),similartotraditionalCiscoIOSsoftwareimplementation,orasseparateisolatedinstancesofthesameroutingprotocol(EBGP,RIPv2).
Thisisthesameissueasthequestion201.
QUESTION8
TheVPNnamedmy_vpnisoperatingoninterfaces0/0ofaPE-router.TheCE-PEroutingprotocolisOSPF.
TheMPLSbackboneIPGisOSPF.
Whichstatementistrueabouttheinteractionbetweenthecustomer'sOSPFroutesandthebackbone'sOSPFroutes?
A.
OnthePE-router,twoinstancesofOSPFarerun:
onefortheVPNandoneforthebackboneIGP.
B.
OnthePE-router,threeinstancesifOSPFarerun:
onefortheVPN,oneforthebackboneIGP,andonetocarrythePE-PREroutes.
C.
ThisconfigurationisacceptableforMPLSimplementations.
However,whenMPLSVPNsareimplemented,OSPFcannotbeusedastheCE-PEroutingprotocolandthebackboneIGP.
D.
OnthePE-router,asingleinstanceofOSPFisrun.
However,thecustomer'sroutesarekeptseparateforthebackboneroutebecausetheRDispreparestothecustomer'sroutes.
Answer:
C
Section:
(none)
Explanation/Reference:
Explanation:
ItisimportanttonotethattheMPLS/VPNbackboneisnotarealOSPFarea0backbone.NoadjacenciesareformedbetweenPErouters-onlybetweenPEandCErouters.MP-iBGPisusedbetweenPErouters,andallOSPFroutesaretranslatedintoVPN-IPv4routes.ThismeansthattheredistributionofroutesintoBGPdoesnotcausetheseroutestobecomeexternalOSPFrouteswhenadvertisedtoothermembersitesofthesameVPN.Reference:
MPLSandVPNArchitectures(Ciscopress)page235
QUESTION9
Exhibit:
WhichstatementistrueaboutroutesummarizationforroutesannouncedtothebackbonebyArea1?
A.
Bydefault,routeswillnotbesummarized.
B.
Bydefault,routeswillbesummarizedonthenetworkboundaries.
C.
Bydefault,routeswillbesummarizedtoArea3(NSSA)butnottoArea2.
D.
Bydefault,routeswillbesummarizedbaseduponthesummarizationscheduleconfiguredintheCE-router.
Answer:
B
Section:
(none)
Explanation/Reference:
Explanation:
Summarizingistheconsolidationofmultipleroutesintoonesingleadvertisement.ThisisnormallydoneattheboundariesofAreaBorderRouters(ABRs).Althoughsummarizationcouldbeconfiguredbetweenanytwoareas,itisbettertosummarizeinthedirectionofthebackbone.Thiswaythebackbonereceivesalltheaggregateaddressesandinturnwillinjectsthem,alreadysummarized,intootherareas.Therearetwotypesofsummarization:
1.Inter-arearoutesummarization
1.Externalroutesummarization
Reference:
QUESTION10
WhatistheinfluenceoftheDownbitontheOSPFroutesectionprocess?
A.
OSPFrouteswiththeDownbitsetareneverenteredintheM-BGProutingtable.
B.
OSPFrouteswiththeDownbutsetareneverenteredinthebackbone'sIGProutingtable.
C.
OSPFrouteswiththeDownbitsetarepassedupthehierarchicalmodel.
Theyareblockedfrombeingpasseddownthehierarchicalmodel.
D.
OSPFrouteswiththeDownbitsetaremarkedasunavailable.
AfterthethirdconsecutiveupdatewiththeDownbitset,theyareremovedfromtheroutingtable.
Answer:
A
Section:
(none)
Explanation/Reference:
Explanation:
CustomerroutesareNEVERenteredintothecoreIGPinanMPLSenvironment.Thedownbitdoesnotchangethisfact.Whatisdoesdoinsteadisthatitpreventroutesredistributesfromm-bgptoOSPFfrombeingredistributedbackintoM-bgp.ThismakesAthecorrectanswer
QUESTION11
Exhibit:
Whatistheinteractionbetweenasuper-backboneandArea3?
A.
Thesuper-backboneappearsasaNSSAtothenon-backboneOSPFroutersofArea3.
B.
Thesuper-backboneappearsasBGPdomaintothenon-backboneOSPFroutersofArea3.
C.
Thesuper-backboneappearsasanotherOSPFareatothenon-backboneOSPFroutersofArea3.
D.
Thesuper-backboneappearsasArea0(backbonearea)tothenon-backboneOSPFroutersofArea3.
Answer:
D
Section:
(none)
Explanation/Reference:
Explanation:
Traditionally,anelaborateOSPFnetworkconsistsofabackbonearea(area0)andanumberofareasconnectedtothisbackboneviaanareaborderrouter(ABR).ByusinganMPLSbackboneforVPNwithOSPFonthecustomer'ssite,youcanintroduceathirdlevelinthehierarchyoftheOSPFmodel.ThisthirdleveliscalledtheMPLSVPNsuperbackbone.
Insimplecases,theMPLSVPNsuperbackboneiscombinedwiththetraditionalarea0backbone.Thismeansthatthereisnoarea0backboneonthecustomernetwork,sincetheMPLSVPNsuperbackboneplaysthesameroleasthearea0backbone.Thisisshowninthediagrambelow:
Reference:
QUESTION12
HowareOSPFrouteattributespropagatesacrosstheMPLSVPNbackbone?
(Choosetwo)
A.
OSPFpriorityispropagatedintheExperimentalBits.
B.
OSPFcostorexternalmetricispropagatedintheBGPMEDattribute.
C.
Metricsfo
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