CiscoCCNA考试七十九题Word文件下载.docx

CiscoCCNA考试七十九题Word文件下载.docx

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answera. 

4.whichofthefollowingisde-encapsulation?

a.strippingtheheaderfromaframe 

b.puttingaheaderonasegment 

c.puttingaheaderonaframe 

d.strippingaframefromalink 

answera.thisalsoincludestrailersasinquestion2. 

5.whatlayerconvertsdataintosegments?

c.transport 

answerc. 

6.whatlayerconvertsdataintopackets?

a.network 

b.application 

c.physical 

d.datalink 

7.whatlayerconvertsdataintoframes?

b.physical 

c.datalink 

d.transport 

8.whatlayerconvertsdataintobits?

b.session 

answerd.allofthelayersneedtoconvertdataintosomethingthattheycanpassdowntothenextlevel,withtheexceptionoftheapplicationlayerwhichhandsdatatothepresentationlayer.thepresentationlayerencrypts,andcompressesbeforesendingittothesessionlayerforitsfirstconversion. 

9.whichlayerismostconcernedwithgettingdatafromthebeginningtothefinaldestination?

c.session 

answerd.thetransportlayerismostconcernedwithreliabletransportationfromoneendtotheother. 

10.whichofthefollowingisnotapartofthesessionlayer?

a.establishingasession 

b.ensuringerrorfreesegments 

c.endingasession 

d.keepingthesenderandreceiverfromsendingamessageatthesametime 

answerb.thatisthejobofthetransportlayer. 

11.whichofthefollowingisnotajobforthepresentationlayer?

choose2 

a.datarepresentation 

b.compression 

c.dialogmanagement 

d.transmission 

e.encryption 

answercd.cishandledbythesessionlayer,anddishandledbythetransportlayer 

12.whatdoespeertopeercommunicationinvolve?

a.eachlayercommunicationwiththelayerbelowit 

b.eachlayercommunicationwithlayeraboveit 

c.eachlayercommunicatingwithadjacentlayerinanothersystem 

d.eachlayercommunicationwithitscorrespondinglayerinanothersystem 

answerd.answercsoundscorrectalso,butadjacentandcorrespondingaretwodifferentthings.thesessionlayercanonlycommunicatewiththesessionlayerinanothersystemforexample. 

13.whydoestheindustryusealayeredmodel?

chooseallcorrect 

20.whichofthefollowingareexamplesoflayer3addressing?

a.165.33.4.34 

b.aa77:

3827:

ef54 

c.hhhh:

hg:

7654 

d.76 

answerab.thefirstisatcpipaddressandthesecondisanipxaddress 

21.whatisconsideredlayer3addressing?

a.datalinklayer 

b.networklayer 

c.applicationlayer 

d.noneofthese 

answerb.physicalislayer1,thendatalink,andthennetwork.thisisthesamelayerthatroutersareon. 

22.whatlayerarebridgeson?

a.datalink 

c.application 

answera.bridgessegmentnetworksbutarenotabletodetermineaddresseslikethenetworklayerdoes. 

23.repeatersareonwhatlayer?

a.transport 

d.application 

answerc.allrepeaterscandoisboostasignal.anactivehubisagoodexampleofarepeater.aswitchinghubisagoodexampleoflayer3addressing,sinceswitchesgobynetworkaddressesandipxaddressesratherthanjustboostsignals.bridgescanonlyreadmacaddresses,andnotthefullipxortcpipaddresses. 

24.whichofthefollowingareconsideredroutingprotocols?

a.ospf 

b.ip 

c.ipx 

d.eigrp 

e.tokenring 

answerad.answersbandcareroutedprotocols,whereasaanddaretheprotocolsthatdotherouting.thisiseasilyconfused.youcanrememberitbythinkingthattheroutingprotocolsthathaultheroutedprotocolsarelikeatugshippullingabarge.thebargeisfullofdata. 

25.whichtwoofthefollowingareconsideredconnectionorientedcommunication?

a.setupandmaintenanceproceduresareperformedtoensuremessagedelievery 

b.aphysicalcircuitexistsbetweentwocommunicatingdevices 

c.itisabestefforttypeofcommunication 

d.avirtualconnectionexistsbetweenthetwo 

answerad.bisnotanecessity,andcisnotaccurate.tcpisconnectionorientedandudpisnot. 

26.whichofthefollowingarenotwanprotocols?

a.framerelay 

b.atm 

c.ethernet 

d.fddi 

e.isdn 

answercd.ethernetandfddiarelanprotocols. 

27.whichofthefollowingwillallowyoutoviewnvramscontents?

a.showconfiguration 

b.showprotocols 

c.showversion 

d.showrunning-config 

e.showstartup-config 

answerae.theseshowthebackupconfigurationstoredinnvram.theotheranwsersallowyoutoviewram. 

28.whichofthefollowingcontainstheosimage?

a.flash 

b.nvram 

c.ram 

d.interfaces 

answera.romwillbeusedifflashisunavailable.nvramisthebackupconfiguration,andramistheactiveconfiguration 

29.whichofthefollowingindicatestherouterisinprivilegemode?

a.router# 

b.router>

c. 

router- 

d.router* 

answera.answerbshowstherouterinusermode. 

30.whatdoes"

showcdpneighbors"

notshow?

neighbors_________ 

a.deviceid 

b.hardwareplatform 

c.iosversion 

d.porttypeandnumber 

31.whichofthefollowingwillshowyoutheclock?

a.cl?

b.cl?

c.clock?

d.clock?

answerd.bytypingthistherouterwillfinishthecommandandshowtheclock. 

32.cdpoperatesatwhichlayer?

b.network 

answerc.cdpallowsanetworkdevicetoexchangeframeswithotherdirectlyconnectednetworkeddevices. 

33.whichcommanddoesnotshowtwodevicesarenotroutingpacketsbetweenthemsuccessfully?

a.ping 

b.showinterface 

c.trace 

d.telnet 

answeracd.withthesecommandsyoucantellwhetherornotyouhavecommunication.showinterfacejustverifiesthereisaconnection 

34.whatkeystrokesshowsthepossiblecommandsinprivilegemode?

a.help 

b.h 

c.ctrl+h 

d.?

answerd.answersaandbwillgiveabriefdescriptionwhentyped,andcisnotvalid. 

35.whichtwoitemscontainversionsoftheroutersconfigurationfile?

d.rom 

answerbc.aanddcontaintheos. 

36.whichofthefollowingcommandswillallowyoutoreviewthecontentsofram?

answerbcd.aanddallowyoutoseenvram. 

37.whichofthefollowingwillallowyoutoadd,modify,ordeletecommandsinthestartupconfigurationfile?

a.showstartup-config 

b.showrunning-config 

c.configureterminal 

d.configurememory 

answerd.answercallowsyoutochangeitemsintherunningconfigurationfile 

38.whichcommandwouldbeusedtorestoreaconfigurationfiletoram?

________tFtprunning-config 

a.router#copy 

copy 

c.router*copy 

d.router^copy 

answera.youmustbeinprivilegemodewhenexecutingthis,whichiswhyyouseethe#sign. 

39.whichofthefollowingcommandswilldisplaytherunningconfigurationfiletoaterminal?

a.showrunning-config 

b.showrouter-config 

c.router#showflash 

d.router>

showversion 

answera.itcanonlybeshowninprivilegemode. 

40.ifyouneedtocopythecurrentlyexecutingconfigurationfileintonvram,whichcommandwouldyouuse?

a.router#copystartup-configrunning-config 

b.router#copystartup-configtftp 

c.router#copyrunning-configstartup-config 

copystartup-configrunning-config 

answerc.answersabcshowthattherouterisinprivilegemodewhichisnecessarytocompletethisaction,butonlycshowsthecorrectsyntax.

41whichofthefollowingcommandswouldnotsetapasswordonaCISCOrouter?

a.router（config）#enablesecret 

b.router（config-line）#passwordtest 

c.router（config）#serviceencryptionpassword 

d.router（config）#enablepassword 

answerc.thiscommandisusedtoencryptpasswordsinconfigurationfiles. 

42.whichofthefollowingwouldcausearoutertobootintotheinitialconfigurationdialogafterpoweringhascycled?

a.someonehadcopiedthestartupconfigurationfileinatftpserver 

b.therunningconfigurationfilewascopiedtothestartupconfigurationfile 

c.itisthefirsttimerouterhaseverbeenturnedon 

d.thewriteerasecommandwasexecutedimmediatelybeforepoweringdowntherouter. 

answercandd.thesetwoscenariosdescribewhatwillhappenwhentherouterneedstousenvramtobootifitcannotfindtheconfigurationfile. 

43.whatwouldcausearoutertobootfromrom?

a.0x3202 

b.0x2302 

c.0x2101 

d.0x2103 

answerc.aconfigurationregisterof1or0willcausetheroutertobootfromrom. 

44.wheredoestherunningconfigfileexist?

a.nvram 

b.rom 

d.flash 

answerc.thisfileiserasediftherouterisr