CCNA4考试.docx

CCNA4考试.docx

《CCNA4考试.docx》由会员分享，可在线阅读，更多相关《CCNA4考试.docx（163页珍藏版）》请在冰豆网上搜索。

CCNA4考试

1Whichcommandwilldisplaystatisticsforallinterfacesconfiguredonarouter?

listinterfaces

showinterfaces√

showprocesses

showstatistics

2WhichofthefollowingarefunctionsofaWAN?

（Choosethree.）

permitreal-timecommunicationbetweenusers√

allowusersaccesstohighbandwidthprovidefull-timelocalserviceprovidee-mailande-commerceservices√connectphysicallyadjacentdevicesprovideaccesstocomputersinotherlocations√

3WhichstatementsaboutVLANsaretrue?

（Choosethree.）

VLANsarerestrictedtoaphysicalsegment.

Theyarelogicalgroupingsofdevices.√

 Userhostscanbegroupedbyfunction.√

 VLANsareconfiguredbysoftware.√

VLANsarestandardized.

4WhichdeviceallowsdatacommunicationtooccurbetweenVLANs?

bridgehubswitchrouter√

5WhatdetermineshowmuchdataasendingstationrunningTCP/IPcantransmitbeforeitmustreceiveanacknowledgment?

segmentsizetransmissionratebandwidthwindowsize√sequencenumber

6Whatisthelength,inbits,ofanEthernetaddress?

12243248√80128

7Whichlayerisresponsiblefororganizingbitsusingframing?

Layer1Layer2√Layer3Layer4

8WhichofthefollowingmessagesaresentfromaDHCPservertoaclientduringasuccessfulconfigurationprocess?

（Choosetwo.）DHCPDISCOVERDHCPOFFER√DHCPREQUESTDHCPACK√

9WhataretheeffectsofLANsegmentationusingaswitch?

（Choosethree.）dedicatedbandwidthbetweensourceanddestinations√enlargedcollisiondomainsdecreasedbroadcastdomainsincreasednumberofcollisiondomains√increasedlatencyinthenetwork√

10TheswitchesinthegraphicareconfiguredforVTPasshown.Selectthestatementsthatcorrectlydescribetheoperationoftheseswitches.（Choosetwo.）AnewVLANcanbeaddedtoSwitch1andthatinformationwillbeaddedonlytoSwitch2.AnexistingVLANcanbedeletedfromSwitch2andthatVLANwillbedeletedfromSwitch1andSwitch4.AnewVLANcanbeaddedtoSwitch4andthatinformationwillbeaddedtoSwitch1,Switch2,andSwitch3.AnewVLANcanbeaddedtoSwitch1andthatinformationwillbeaddedtoSwitch2andSwitch4.√AnewVLANcanbeaddedtoSwitch3andthatinformationwillbeaddedtoSwitch1,Switch2,andSwitch4.AnexistingVLANcanbedeletedfromSwitch4andthatVLANwillbedeletedfromSwitch1andSwitch2.√

11WhatdoestheISDNBRIprovide?

23Bchannelsandone64kbpsDchanneltotalbitrateupto1.536Mbpstwo56kbpsBchannelsandone64kbpsDchanneltwo64kbpsBchannelsandone16kbpsDchannel√

12Whichstatementiscorrectconcerningroutingandroutedprotocols?

Aroutedprotocolallowstherouterstocommunicatewithotherroutersandmaintaintablesforaroutingprotocol.√Aroutingprotocolallowsrouterstocommunicatewithotherroutersandmaintaintablesforaroutedprotocol.Routersonlyneedtouseroutingprotocolstoworkproperly.Thereisnodifferencebetweenroutedandroutingprotocols.

13WhichutilitycanbeusedtoverifyconnectivitythroughallsevenlayersoftheOSImodel?

netstatpingTelnet√traceroute

14WhatisthepurposeoftheIOS“enablesecret”command?

tosetpasswordprotectiononincomingTelnetsessionstosetpasswordprotectionontheconsoleterminaltoallowauseraccesstoUsermodetoallowausertoenterapasswordthatwillbeencrypted√

15IftheabovenetworkhasbeenconfiguredwithRIPv2,howmanyusablehostaddressesareinthe192.168.10.192/30subnet?

02√468

16Whichaddressdoesabridgeusetobuilditsbridgingtable?

destinationIPaddressdestinationMACaddress√sourceIPaddresssourceMACaddress

17WhichstatementdescribesthestoreandforwardtransmissionmodeofanEthernetswitch?

Itisalsoreferredtoasahybridmodeoraserrorsensingmode.Itrequirestheswitchtoreadthefirst64bytesofanEthernetframeandthenbeginstoforwardthedata.Itdecreasesthelatencyofthetransmissionbuthasverylittleerrordetection.Itincreaseslatencywithlargeframes,buterrordetectionishigh.√

18Whatenablesrouterstolearnofdestinationnetworks?

proxyARPCAMtableexchangeshostnametablesroutingprotocols√DNSlookups

19Bydefault,whichofthefollowingmetricsisgiventhemostweightbyIGRP?

bandwidth√hopcountloadreliability

20WhichmethoddoesarouterusetobuildaFrameRelaymap?

ARPrequestsRARPrequestsInverseRARPrequestsInverseARPrequests√

21WhichofthefollowingrepresentsagroupofroutersunderacommonadministrationandisrequiredwhenconfiguringroutingprotocolssuchasIGRPorEIGRP?

controlgroupautonomoussystem√corporatesystemDomainNameSystemlocal-areanetworkwide-areanetwork

22Identifythecorrectpairingofaprotocolanditsclassification.BGP-InteriorIGRP-ExteriorOSPF-ExteriorRIP-Interior√

23WhichstatementsdescribetheuseofLinkStateAdvertisements（LSA）?

（Choosetwo.）LSAsaregeneratedwhenchangesinthenetworkoccur.√Linkstateadvertisementsarerefreshedevery60minutes.TheroutercopiestheinformationreceivedfromeachLSApacketintotheroutingtable.RoutersexchangeLSAstobuildandmaintaintopologydatabases.√ForwardingLSAscanincreasetheoccurrenceofroutingloops.

24Routersandswitchesbothperformimportanttasksinaninternetwork.Whichofthefollowingaredistinguishingdifferencesbetweenthem?

（Choosetwo.）Routersareusedmorethanswitches.Routersneednoconfigurationtooperate.RoutersandswitchesoperateatdifferentlayersoftheOSImodel.√Routersandswitchesroutedifferentsetsofprotocols.Routersblockbroadcasts.√Switchescreatebroadcastdomains.

25Whichofthefollowingdoswitchessendatregularintervalstoeliminateswitchingloops?

bi-directionalprotocoldataunitsbinaryprotocoldataunitsbridgeprotocoldataunits（BPDU）√bufferedprotocoldataunits

26WhichofthefollowingIPaddressesarebroadcastaddressesifthesubnetmaskis255.255.255.240?

（Choosethree.）75.32.75.15√205.16.35.11199.254.129.111√129.130.17.143√135.22.55.93105.33.62.213

27ForwhichconditionwilltheARPprotocolbeused?

ThedestinationIPaddressisunknown.ThedestinationMACaddressisunknown.√ThesourceIPaddressisunknown.ThesourceMACaddressisunknown.

28Whichofthefollowingistrueregardinglatency?

CSMA/CDrequiresnolatency.Itisalsocalledasymmetry.Itisbasedentirelyondistance.Networkingdevicesaddtolatency.√

29TheCakeroutershowninthegraphichasmultipleRIPversion2（hopcourters）pathstothenetworkattachedtoE0ofthePierouter.WhichinterfaceontheCakerouterwillbeusedtoforwardapacketfromthe192.168.5.0networktothe192.168.13.0network?

E0E1√S0S1ItwillloadbalanceacrossS0andS1.ItwillloadbalanceacrossS0,S1andE1.

30WhatisrequiredtoconfiguremultipleDLCIsonasinglerouterinterface?

AsinglenetworkaddressMultipleLMIsSubinterfaces√MultipleIPaddressesonthesamesubnet

31Whenmustdatabesentbywayofthedefaultroute?

Thedestinationnetworkisonadifferentnetworkthanthesource.Thedestinationnetworkisnotdirectlyconnectedtotherouter.Thedestinationnetworkisastubnetwork.Thereisnoentryintheroutingtableforthedestinationnetwork.√

32WhichofthefollowingEIGRPfunctionsistheresponsibilityoftheIPprotocol-dependentmodule（PDM）?

（Choosethree.）thecalculationofsuccessorandfeasiblesuccessorroutesforIPandIPXtrafficthenotificationofDUALwhenIProutinginformationisreceived√thecommunicationofinformationaboutIProuteswithneighborroutersthemaintenanceoftheIProutingtabletheexchangeofhellopacketswithotherIP-enabledrouters√theinsertionoflowestcostpathsintotheroutingtable√

33WhichreasoniscorrectforhavingatleastonetrueconditioninanACL?

Ifthereisnotatruestatement,allpacketsarereturnedtothesender.Theimplicit"denyany"statementwilldenyalltraffic.√Trueconditionsonlytestthestatusoftherouter.YouarenotrequiredtohaveatruestatementinACL.

34CompanyXYZhasaClassBaddressof135.166.0.0andcurrentlyhas4individualsegmentstosubnet.Thecompanywillbeadding5additionalsegmentsoverthisyearand7additionalnetworksthefollowingyear.Whatsubnetmaskshouldbeusedonthenetworkinordertosupportthelargestnumberofhostspersubnet?

255.255.224.0255.255.240.0255.255.248.0√255.255.250.0255.255.252.0

35Givenarouterthathasalreadybeenconfigured,whatisthecorrectloadingsequencewhenpoweringon?

bootstrap,RAM,operatingsystembootstrap,configurationfile,operatingsystembootstrap,operatingsystem,configurationfile√operatingsystem,configurationfile,RAM

36WhatisanadvantageoftheuseoflayersintheOSIreferencemodel?

Itbreaksnetworkcommunicationsintolargerparts.Itincreasescomplexity.Itpreventschangesinonelayerfromaffectingotherlayers.√Itrequirestheuseofsingle-vendorequipmentforhardwareandsoftwarecommunications.

37Whichofthefollowingistrueregardingroutingmetrics?

Allroutingprotocolsusethesamemetrics.IGRPusesbandwidthasitsonlymetric.Routerscomparemetricstodeterminethebestroute.√Thelargermetricgenerallyrepresentsthebetterpath.

38Whichofthefollowingareroutedprotocols?

AppleTalk,IP,IGRPIP,IPX,AppleTalk√IP,RIP,IPXIPX,OSPF,EIGRP

39Whichnetworkingdeviceperformspathdetermination?

ahubaswitcharouter√abridge

40WhichtypeofACLonlychecksthesourceaddress?

ExtendedACLGeneralACLSourceACLStandardACL√

41WhatisthedefaultISDNencapsulationusedonCiscoISDNrouters?

SLIPPPPHDLC√VPP

42WhichofthefollowingimprovessecurityinPPPauthentication?

LCPNCPCHAP√PAP

43WhatisthefunctionofthefirstphaseofPPPn