2024年计算机考试-juniper认证笔试考试历年高频考点试题摘选含答案

2024年计算机考试-juniper认证笔试考试历年高频考点试题摘选含答案第1卷一.参考题库(共75题)1.ABridged1483serviceofferingisgroupingDSLusersintoalargesubnet.Whatarethreecharacteristicsofthisconfiguration？（）A、ItburnsIPaddresses.B、ItconservesIPaddresses.C、AgroupofPVCsisasubnet.D、ItprovidesanumberedIPaddresstotheERXE、ItprovidesanIPunnumberedaddresstoERX2.WhichJ-Webtabdoyouusetoaddlicensestothedevice?（）A、"Configure"B、"Troubleshoot"C、"Monitor"D、"Maintain"3.Whichtwomethodsareusedtoassignaroute-distinguisherinaKompellaLayer2VPN?（）A、byassigningtheRDundertherouting-instancesB、byassigningtheRDunderprotocolsbgpC、byassigningtheRDunderrouting-optionsD、byassingtheRDunderpolicy-options4.Youissuethepinginterfacet1-1/1/0bypass-routingcount1000rapidcommand.Whichstatementiscorrect?（）A、Thecountparametercreatesacounterthatyoucanviewwiththeshowfirewallcommand.B、Thecountparameterallowstheroutertocountthenumberofpingsforloggingpurposes.C、Thecountparameterallowstheroutertopausefor1000secondsbeforesendingoutaping.D、Thecountparameterallowstheroutertosendout1000pingsandthenstop.5.WhichCLIcommanddoyouusetoblockMIMEcontentatthe[editsecurityutmfeature-profile]hierarchy?（）A、setcontent-filteringprofilepermit-commandblock-mimeB、setcontent-filteringprofileblock-mimeC、setcontent-filteringblock-content-typeblock-mimeD、setcontent-filteringnotificationsblock-mime6.Anewsoftwareengineerhasbeenhired.Aspartofthenormalhiringprocess,theuserwasaddedtotheActiveDirectoryandplacedintotheDomainUsersgroupandtheSW_DEVgroup.TheDomainUsersgrouphasaccesstothecompany'sintranetwebsiteandtimecardsystem.TheSW_DEVgrouphasaccesstothesourcecodelibraryserver.YouhavecreatedrolesthatcorrespondtoeachActiveDirectorygroup.Theusercallsthehelpdeskstatingthattheycannotaccessthesourcecodelibraryserver. WhichtwotroubleshootingtoolswouldyouuseontheJunosPulseAccessControlServicetoresolvetheissue?（）A、Performapolicytraceforthespecificuserandreviewtheoutputtoisolatetheproblem.B、ReviewtheEventslog.C、ReviewtheAdminAccesslogtoverifythattheuserhasthecorrectpermissionstoaccesstheSVVJDEVresource.D、ReviewtheUserAccesslogtoverifythattheuserisgettingmappedtoboththeDomainUserroleandtheSW_DEVrole.7.Whatistheadministrativescopingaddressrangeassociatedwithglobalscope?（）A、/24B、/10C、/14D、-558.In IS-IS， how long will the restart helper keep the restarting router in the up state？（）A、The hello dead timer expires.B、The restart duration timer expires.C、The restarting router sets the down bit.D、The restart helper sends out three CSNPs.9.Whichcommanddoyouusetodisplaythemessagesseenduringthelastsystemboot?（）A、showsystemboot-messagesB、showchassismessagesC、showfilesystemboot-messagesD、showboot-logmessages10.WithintheL2TPLNSconfigurationoftherouter,whereisthePPPauthenticationmethodspecified?（）A、profileB、remotehostC、aaadomain-mapD、l2tpdestinationprofile11.Which two statements are true regarding proxy ARP？（）A、Proxy ARP is enabled by default.B、Proxy ARP is not enabled by default.C、JUNOS security devices can forward ARP requests to a remote device when proxy ARP is enabled.D、JUNOS security devices can reply to ARP requests intended for a remote device when proxy ARP isenabled12.YouhavereceivedadefaultroutethroughBGPfromyourISPandyouwanttoredistributeitintoOSPF.Whichmethodwillaccomplishthis?（）A、ApplyanexportpolicytoOSPFthatexportsthedefaultrouteB、ApplyanimportpolicytoOSPFthatimportsthedefaultrouteC、Applythedefault-networkcommandtoOSPFD、Applytheredistribute-igpcommandtoBGP13.ACandidateRPreceivesabootstrapmessagewithahigherprioritythanitsown.Whathappens?（）A、UsehighestIPaddressasBSR.B、Resetthebootstraptimerandcontinuetolisten.C、Forwardalltraffictothebootstrapmessageoriginator.D、DeclareselfasBSRandsendbootstrapmessagesevery60seconds.14.Whichthreeauthenticationresourcesaregroupedwithinanauthenticationrealm?（）A、AuthenticationenforcerB、DirectoryserverC、CaptiveauthenticationD、AuthenticationpolicyE、Role-mappingrules15.WhatisthedefaultprotocolpreferenceforOSPFinternalroutes?（）A、10B、15C、150D、16016.WhatisthemaximumnumberofinputpolicyliststhatyoucanattachtoanIPinterface？（）A、1B、2C、128D、51217.Whatarethreeterminatingactionsforfirewallfilters?（）A、rejectB、dropC、permitD、acceptE、discard18.Which IDP policy action closes the connection and sends an RST packet to both the client and the server？（）A、close-connectionB、terminate-connectionC、close-client-and-serverD、terminate-session19.Whichthreecommandswillcausealogicalinterfacetogoadministrativelydownafterbeingcommitted?（）A、shutdownB、deactivateC、disableD、downE、delete20.The ERX Edge Router responds to a received PPP over Ethernet Active Discovery Initiation （PADI） with which message type？（）A、PPPoE Active Discovery OfferB、PPPoE Active Discovery InitiationC、PPPoE Active Session ConfirmationD、PPPoE Active Session Acknowledgment21.WhatisthedefaultprotocolpreferenceforBGPEBGProutes?（）A、10B、100C、170D、17522.YouareconfiguringanLDAPauthenticationserver,andyouwanttoconfigurerole-mappingrulesbasedongroupmembership.Whenyouattempttosearchforgroupsintheservercatalog,nogroupsappear.AssumingtheLDAPserverisreachableandfunctioningproperly,intheadminGUI.Whichtwopartsoftheconfigurationshouldyouverifyarecorrect?（）A、FindinguserentriesB、AuthenticationrequiredC、LDAPServerTypeD、Determininggroupmembership23.WhichJunosPulseAccessControlServiceclientprovidesabuilt-inviewertoaccesslocallogs?（）A、OdysseyAccessClientB、JunosPulseC、JavaagentD、Agentlessaccess24.WhichtwomechanismscontrolroutedistributionbetweenPEroutersina2547bisVPN?（）A、siteidB、policiesC、circuitidD、extendedcommunities25.YouwouldliketoconfigureanATMPVCwithavirtualcircuitidentifierof33onvirtualpath0.ThePVCshoulduseanunspecifiedbitrateandbeencapsulatedintheAAL5SNAPformat. Whichcommandaccomplishesthisgoal?（）A、atmpvc0/33aal5snapB、atmpvc33033aal5snapC、atmpvc0/33aal5snapubrD、atmpvc33033aal5snapubr26.ForwhichBGPattributeisahighervaluepreferred?（）A、OriginB、CommunityC、LocalPreferenceD、ASPathlength27.Which two statements regarding system logging on a Juniper enterprise router are correct？（）A、The system log has a proprietary format.B、System logs must be sent to a remote device.C、New system logs can be created and archived.D、Most software processes create their own logs.28.WhichtwostatementsaretrueregardinganEthernetcollisiondomain?（）A、Ifaswitchisused,thecollisiondomainislimitedtoeachdeviceandtheswitch.B、Ifahubisused,thecollisiondomainislimitedtoeachdeviceandthehub.C、Ifahubisused,thecollisiondomainincludesalldevicesconnectedtothehub.D、Ifaswitchisused,thecollisiondomainincludesalldevicesconnectedtotheswitch.29.Which multicast groups support Auto-RP mapping and discovery？（）A、9B、9C、0D、030.WhichthreeBGPstatesareassociatedwithestablishingTCPconnectivity?（）(Choosethree.)A、IdleB、ActiveC、ConnectD、OpenSentE、Established31.WhatisthedefaultSNMPpermissionlevelonJunosdevices?（）A、readB、read-writeC、read-onlyD、write32.What is a function of the OSPF Type 7 LSA？（）A、It describes the reachability of routes in stub areas.B、It describes the reachability of routes in totally-stubby areas.C、It describes the reachability of routes in not-so-stubby areas.D、It describes the reachability of routes in partially-stubby areas.33.Referingtotheexhibit,whichstatementiscorrect?（） A、Thepacketshaveexceededthetime-to-livevalueB、ThereisaloopC、TheasterisksindicatearesponsetimeoutD、Theasteriskindicatethatthetracerouteiscompleted34.WhenanSRXseriesdevicereceivesanESPpacket,whathappens?（）A、IfthedestinationaddressoftheouterIPheaderoftheESPpacketmatchestheIPaddressoftheingressinterface,itwillB、IfthedestinationIPaddressintheouterIPheaderofESPdoesnotmatchtheIPaddressoftheingressinterface,itwillC、IfthedestinationaddressoftheouterIPheaderoftheESPpacketmatchestheIPaddressoftheingressinterface,basedpacket.D、IfthedestinationaddressoftheouterIPheaderoftheESPpacketmatchestheIPaddressoftheingressinterface,basedofinnerheader,itwilldecryptthepacket.35.WhichcommandpromptsanERXEdgeRoutertogointoaloopbackmodeonT1number1whenacommandisreceivedfromaremoteERXEdgeRouter?（） A、AB、BC、CD、D36.Whatarethreetypesofroutinginstances?（）A、VPNB、virtual-routerC、policyD、VRFE、forwarding37.WhichtwocommandswouldyouusetoviewOSPFroutes?（）A、showiprouteospfB、showospfroutesC、showrouteprotocolospfD、showroute38.You have a firewall filter containing two terms applied in an inbound direction on a customer interface. You would like this filter to protect your network from a spoofed denial of service attack. What match criterion should be used in the first term of the filter？（）A、Source TCP portB、Source IP addressC、Destination TCP portD、Destination IP address39.In a bridged 1483 network， what configuration command allows the ERX Edge Router to advertise customer networks into the provider’s IGP？ （）A、redistribute directB、redistribute staticC、redistribute connectedD、redistribute access-internal40.YouwouldliketoconfigureyourPC'sIP

addressof56asanFTPhostwithausernameofuserandapasswordofmypass.Whichconfigurationcommandaccomplishesthisgoal?（）A、hostuserpc56ftpusermypassB、hostuserpc56tftpusermypassC、hostnameuserpc56ftpusermypassD、hostnameuserpc56tftpusermypass41.Anetworkadministratorwantstoverifytheactivealarmsoninterfaceso-0/0/0.0.Whichcommanddisplaysthisinformation?（）A、showinterfacesalarmsB、showinterfacesterseC、showalarmsextensiveD、showinterfacesextensive42.WhichtwostepsarerequiredforaKompellaLayer2VPN?（）A、Configureasite

idforeachce.B、ConfigureaVPNlabelforeachVPN.C、ConfigureaMP-bgpsessiontoeachpe.D、ConfigureanExtendedLDPSessiontoeachpe.43.WhichtwostatementsaretrueregardingtraceoptionsonJunosdevices?（）A、YoucanseethecontentsofthelogfilebyenteringtheshowlogcommandB、TraceoptionswillsendinformationtoyourscreenautomaticallyC、TraceoptionsarelimitedtooneprotocolatatimeD、Thefilenameandsetofflagsmaybespecifiedwhenenablingtraceoptions44.YouarereceivingreportsofpossibleunauthorizedaccesstoresourcesprotectedbyafirewallenforcerrunningtheJunosOS.Youwanttoveritywhichusersarecurrentlyaccessingresourcesthroughtheenforcer.Whichcommandshouldyouusetoverifyuseraccessontheenforcer?（）A、showservicesunified-access-controlauthentication-tableB、showauthtableC、showservicesunified-access-controlpoliciesD、showservicesunified-access-controlcaptive-portal45.Giventheroutingentriesshownintheexhibit,whichnext-hopIPaddresswillbeusedfordiedestinationIPaddress42?（） A、0B、31C、10.181.1D、3046.WhichtwostatementsdescribethedefaultroutingpolicyforBGP?（）A、Advertiseonlylocallyoriginatedroutes.B、AcceptallBGProutesandimportintoinet.0.C、AdvertiseallactiveBGProutes.D、AdvertiseonlyEBGProutes.47.WhichRADIUSconfigurationcommandimplementsaprimary/backupscenarioformultipleservers?（）A、radiusalgorithmdirectB、radiusalgorithmbackupC、radiusalgorithmprimaryD、radiusalgorithmround-robin48.Whichcommanddoyouusetoidentifythemeaningofasyslogmessage?（）A、helplogmessagesB、manlogmessagesC、mansyslogD、helpsyslog49.YouareatthetopofthehierarchyandmustconfigureOSPFoninterfaceso-0/0/0unit100.Whichtwoachievethisresult?（）A、setprotocols

setospfarea0

setinterfaceso-0/0/0.100B、setprotocolsospfarea0interfaceso-0/0/0.100C、editprotocolsospfinterfaceso-0/0/0.100D、editprotocolsospfarea0

setinterfaceso-0/0/0.10050.Whichthreeattributesarecarriedinasourceactivemessage?（）A、NLRIinformationB、IPaddressoforiginatingRPC、addressofmulticastsourceD、allactiveRPsinthelocaldomainE、groupaddresstowhichthesourceissending51.Whichtwostatementsdescribethecriteriabandwidthdetectionusestodynamicallyalterbandwidthallocation?（）(Choosetwo.)A、Throughputisraisedaslatencydecreases.B、Throughputisbasedonavailablebandwidth.C、Throughputisloweredaslatencydecreases.D、LatencyismeasuredbySYNsreturnedforeachmetapacket.52.What is shown by thecommand show interfaces extensive fe-0/0/0 but not shown by the command show interface detail fe-0/0/0？（）A、input error counterB、interface MTU sizeC、input packets counterD、the IP address on logical interface fe-0/0/0.053.Whichcommandwilldisplaythecontentsoftheforwardingtable?（）A、showrouteforwarding-tableB、showforwardingC、showconfiguration54.Bydefault,ifequal-costpathsexistforthesamedestination,whichactionwilltheroutertake?（）A、Drophalfthetraffic.B、Makeacopyofthetrafficandsendittobothdestinations.C、Load-balancetrafficbetweentheavailablepaths.D、Randomlyselectoneoftheavailablepathstosendtraffic.55.Whatisthehighest(strongest)prioritythatcanbesetonanLSPinJUNOSsoftware?（）A、0B、7C、64D、25556.Whichthreeattributesarecarriedinasourceactivemessage?（）A、NLRIinformationB、IPaddressoforiginatingRPC、addressofmulticastsourceD、allactiveRPsinthelocaldomainE、groupaddresstowhichthesourceissending57.What is the interface connecting the routing engine to the packet forwarding engine called？（）A、Loopback 0B、managementC、internal（fxp1）D、control interface58.Whenconfiguringmorethanonearchivalsite,whichstatementistrue?（）A、ThesystemwillfirstattemptthetransferusingtheURLconfiguredlastB、ThesystemwilltransfertheconfigurationtoeacharchivalsiteC、ThesystemwillnottransfertoasecondarysiteunlesstheprevioussitefailsD、Thesystemwilltransferusingsecurecopyprotocl(SCP)beforeattemptingFTP59.Whichtwostatementsaboutthetrackconfigurationoptionarecorrect?（）A、Thetrackoptionmonitorsinterfacesasdefinedbytheuser.B、ThetrackoptionmonitorsallinterfacesparticipatinginVRRP.C、Thetrackoptionallowsforareductionofthepriorityvalueifthemonitoredinterfacegoesdown.D、Thetrackoptioncausessyslogentriestobewritteninthemessageslogfile,ifthemonitoredinterfacegoesdown.60.HowdoyoudisableaserverfromJuniperDXClusterwithoutterminatingactiveclientrequests?（）A、Deletetheserver.B、"Softpause"thetargetserver.C、"Hardpause"thetargetserver.D、CreateanewClusterwithouttheserver.61.WhichcommandclearsthehistoryofBGPdampedroutes?（）A、clearbgpdampingB、clearbgpneighborC、clearbgpneighbordampD、clearprotocolbgpdamp62.YouareaskedtoconfiguretheconfigurationarchivalfeatureonyourJunosdevices.Whichtwotransfermethodsareavailable?（）A、TFTPB、FTPC、SCPD、SFTP63.For which two functions is the Routing Engine responsible？（）A、packet forwardingB、queuing functionsC、routing protocol controlD、JUNOS software operation64.Which two statements about the use of SCREEN options are correct？（）A、SCREEN options are deployed at the ingress and egress sides of a packet flow.B、Although SCREEN options are very useful， their use can result in more session creation.C、SCREEN options offer protection against various attacks at the ingress zone of a packet flow.D、SCREEN options examine traffic prior to policy processing， thereby resulting in fewer resouces used formalicious packet processing.65.Whichtwoconditions,whenmet,allowanIS-ISLevel2routertobeconsideredattached?（）A、YoucanreachotherLevel2routers.B、Itcanreachatleastoneotherdefinedarea.C、TherouterisreachablebyatleasttwoES-ISnodes.D、Ithasatleastoneenabledreachableprefixwithavalidmetricdefined.66.Whatisanadvantageofdynamicrouting?（）A、Unlikestaticrouting,dynamicroutingprovidesredundantIPaddressesforend-userdevices.B、Unlikestaticrouting,dynamicroutingrequiresnoinitialuserconfiguration.C、Dynamicroutingcanprovideincreasednetworkavailabilitywhencomparedtostaticrouting.D、DynamicroutingprovidesDNSservicesalongwithIPconnectivity;staticroutingdoesnot.67.WhichconfigurationcausesRIP-learnedroutestobeadvertisedtootherRIPneighbors?（）A、setprotocolripno-passiveB、topeditpolicy-optionspolicy-statementdemo

setterm1fromprotocolrip

setterm1thenaccept

topsetprotocolsripgroupinternalexportdemoC、setprotocolsripadvertisein-outD、topeditpolicy-optionspolicy-statementdemo

setterm1fromactiveroutes

setterm1thenaccept

topsetprotocolsripgroupinternalexportdemo68.WhatarethreeexamplesofaCPE-provisionedVPN?（）A、L2TPB、2547bisC、L2FD、PPTPE、MPLS69.InJUNOSsoftware,whichwouldpreventanOSPFrouterfromimportingthe/30summaryroute?（）A、Importpoliciesarenotallowedforinternalroutes,sothisisnotpossible.B、Exportpoliciesarenotallowed,sothisisnotpossible.C、Applyafirewallfiltermatching10.0.0/4/30andrejecttheroute.D、Applyanimportpolicymatching/30andrejecttheroute.70.Whichcommandwillsavethecurrentactiveconfigurationastherescueconfiguration?（）A、user@router#save

rescueB、user@router>requestsystemconfigurationrescuesaveC、user@router#saverescueconfigurationD、user@router>filesaverescue-configuration71.Younavigateto"UAC">"InfranetEnforcer">"AuthTableMapping"intheadminGUI.Youseeonepolicy,whichistheunmodified,originaldefaultpolicy.Whichstatementistrue?（）A、Dynamicauthtablemappingisnotenabled.B、Asuccessfulauthenticationattemptwillresultinanewauthenticationtableentry,whichwillbedeliveredonlytotheJunosenforcerprotectingthenetworkfromwhichtheuserhasauthenticated.C、Tocreateastaticauthtablemapping,youmustdeletethedefaultpolicy.D、Thedefaultpolicyappliesonlytothefactory-defaultroleUser.72.AnadministratorhascreatedthreedifferentOdysseyAccessClientpreconfigurationfilesandassignedthemtothreedifferentrolesinthesamerealm.WhichactionshouldtheadministratortaketoensurethatusersgetthecorrectOdysseyAccessClientpreconfigurationfile?（）A、ConfigureeachuseraccountintheauthserverwiththeappropriateOdysseyAccessClientpreconfigurationfiles.B、Configuretherole-mappingruleswiththeappropriateOdysseyAccessClientpreconfigurationfiles.C、Ensurethatmergerolesisselectedintherole-mappingrules.D、EnsurethatthefirstroleauserismappedtoistherolewiththeappropriateOdysseyAccessClientpreconfigurationfile.73.Whichzoneissystem-defined?（）A、securityB、functionalC、junos-globalD、management74.Howdoyouwritethecurrentcandidateconfigurationtothepermanentstoragemedia?（）A、[edit]

user@router#save/var/tmp/current.confB、[edit]

user@router#write/var/tmp/current.confC、[edit]

user@router#commit/var/tmp/current.confD、[edit]

user@router#dump/var/tmp/current.conf75.WhichconfigurationcommandconfiguresIS-IStosupportMPLSTrafficEngineering?（）A、metric-stylewideB、redistributemplsC、metric-stylenarrowD、dynamic-redistribute第2卷一.参考题库(共75题)1.Whichlogcontainsinformationaboutservicerestarts,systemerrors,warnings,andrequeststocheckserverconnectivity?（）A、EventslogB、SystemlogC、UserAccesslogD、AdminAccesslog2.Which attribute is required for all IKE phase 2 negotiations？（）A、proxy-IDB、preshared keyC、Diffie-Hellman group keyD、main or aggressive mode3.What are three RSVP messages？（）A、PathErr：Path errorB、ResvErr：Reservation errorC、PathConf：Path confirmationD、ResvConf：Reservation confirmation4.Whichzonetypecanbespecifiedinapolicy?（）A、securityB、functionalC、userD、system5.WhichstatementistrueregardingtheJunosOS?（）A、AllplatformsrunningtheJunosOSusethesamesourcecodebaseB、AllplatformsrunningtheJunosOSusethesamePFEC、AllplatformsrunningtheJunosOSuseaharddrivetooptimizesyslogdatastorageD、AllplatformsrunningtheJunosOSuseaseparateprocesswithprotectedmemoryspaceforeachroutingprotocol6.WhatarethreeelementstheJunosPulseAccessControlServiceusestoestablishendpointaccesstoprotectedresources?（）A、sign-inpolicyB、authenticationrealmsC、rolerestrictionsD、policyrealmsE、routingpolicy7.Which CLI command will ping destination  ten times and display the incoming interface of the received packet？（）A、ping count 10  detailB、ping number 10  detailC、ping count 10  extensiveD、ping number 10  extensive8.WhatarethethreecomponentsoftheISONETaddress?（）A、AreaIDB、N-selectorC、SystemIDD、ASnumberE、ISOnumberF、MACaddress9.YouhaveconfiguredaClassifierAccessControlList(CLACL)withmultiplematchclauses.Eachmatchclausehasmultipledefinedfieldswithinit.WhichtwostatementsdescribehowtherouterevaluatesthisCLACL?（）A、Allfieldsineachmatchclausemustmatch.B、AllmatchclausesintheCLACLmustmatch.C、Onlyasinglefieldineachmatchclausemustmatch.D、OnlyasinglematchclauseintheCLACLmustmatch10.You must configure a SCREEN option that would protect your device from a session table flood.Which configuration meets this requirement？（） A、AB、BC、CD、D11.WhatarethreeTLVsthatsupportIS-ISextensionsfortrafficengineering?（）A、ExtendedISreachabilityB、ExtendedIPreachabilityC、TrafficengineeringopaqueD、TrafficengineeringrouterIDE、ExtendedMPLSreachability12.InaJunosPulseAccessControlServicefirewallenforcementconfiguration,whatisthepurposeofthesourceIPpolicy?（）A、tospecifythedestinationaddressestowhichaccessispermittedB、tospecifythesourceaddresspermittedtoaccesstheresourceC、tospecifytheservicestowhichaccessispermittedD、toinformtheenforcertoexpectpolicyinformationfromtheJunosPulseAccessControlService13.WhichCLIcommanddisplayserrorstatisticsforaninterfaceinreal-time?（）A、monitortrafficB、showinterfacesC、monitorinterfaceD、showinterfacesextensive14.WhatarethreecomponentsoftheNETaddress?（）(Choosethree.)A、AreaIDB、N-selectorC、SystemIDD、ISOnumberE、MACaddress15.InaBridged1483network,whichsetofcommandsisusedtoconfigureanATMsubinterface?（） A、AB、BC、CD、D16.DuringOSPFadjacencyformation,inwhichstateisarouterinwhenitisnegotiatingtobeinchargeofthedatabasesynchronizationprocess?（） A、AB、BC、CD、D17.Which two external authentication server types are supported by JUNOS Software for firewall userauthentication？（）A、RADIUSB、TACACS+C、LDAPD、IIS18.Whichstatementistrueregardingthepassword-recoveryprocess?（）A、YoumusthaveaconsoleconnectionB、YoucannotsettheconsoleporttoaninsecuremodeC、YoumustpresstheEnterkeysothatyoucanbootintosingle-usermodeD、WhenpromptedtoenterthefullpahnameoftheshellyoumustpresstheEnterkey19.ThetrafficengineeringextensionstoRSVPprovidewhatfunctionality?（）A、IProutingB、datasecurityC、labeldistributionD、datacompression20.AuserisconnectedonaDSLlineandisusingaPPPoverEthernetservice.WhichnetworkdevicestripstheATMheaderfromthedatagramandinvestigatesthePPPheader?（）A、DSLAMB、DSLmodemC、ERXEdgeRouterD、customerworkstation21.Whichsourceofroutinginformationispreferredbydefault?（）A、OSPFinternalB、OSPFexternalC、IS-ISLevel1D、IS-ISLevel222.Whichthreestatementsare