CCNA试题.docx
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CCNA试题
.WhatisthecorrectorderfortheOSImodel?
P=Presentation,S=Session,D=Datalink,Ph=Physical,T=Transport,A=Application,N=Network
A.PSAPHDNT
B.APSTNDPH
C.PHDNTASP
D.PSATNDPH
Itiscrucialyounotonlymemorizethisandknowwhateachlayerdoes.
2.Whatisencapsulation?
A.Puttingtheheaderonanincomingframe
B.Puttingaheaderonanincomingsegment
C.Puttingaheaderonanoutgoingframe
D.Puttingaheaderonanoutgoingbit
Thisalsoincludestrailersandcanbeputonsegments,packets,andframes.
3.Whichlayerismostconcernedwithuserapplications?
A.Application
B.Presentation
C.Network
D.Physical
4.Whichofthefollowingisde-encapsulation?
A.Strippingtheheaderfromaframe
B.Puttingaheaderonasegment
C.Puttingaheaderonaframe
D.Strippingaframefromalink
Thisalsoincludestrailersasinquestion2.
5.Whatlayerconvertsdataintosegments?
A.Application
B.Presentation
C.Transport
D.Physical
6.WhatlayerconvertsdataintoPackets?
A.Network
B.Application
C.Physical
D.DataLink
7.WhatlayerconvertsdataintoFrames?
A.Application
B.Physical
C.DataLink
D.Transport
8.Whatlayerconvertsdataintobits?
A.Application
B.Session
C.DataLink
D.Physical
Allofthelayersneedtoconvertdataintosomethingthattheycanpassdowntothenextlevel,withtheexceptionoftheApplicationlayerwhichhandsdatatothePresentationlayer.ThePresentationlayerencrypts,andcompressesbeforesendingittotheSessionlayerforitsfirstconversion.
9.Whichlayerismostconcernedwithgettingdata
fromthebeginningtothefinaldestination?
A.Application
B.Presentation
C.Session
D.Transport
Thetransportlayerismostconcernedwithreliabletransportationfromoneendtotheother.
10.WhichofthefollowingisnotapartoftheSessionlayer?
A.Establishingasession
B.Ensuringerrorfreesegments
C.Endingasession
D.KeepingthesenderandreceiverfromsendingamessageatthesametimeThatisthejoboftheTransportlayer.
11.Whichofthefollowingisnotajobforthepresentationlayer?
Choose2
A.Datarepresentation
B.Compression
C.Dialogmanagement
D.Transmission
E.Encryption
Cishandledbythesessionlayer,andDishandledbytheTransportlayer
12.WhatdoesPeertoPeercommunicationinvolve?
A.Eachlayercommunicationwiththelayerbelowit
B.Eachlayercommunicationwithlayeraboveit
C.Eachlayercommunicatingwithadjacentlayerinanothersystem
D.Eachlayercommunicationwithitscorrespondinglayerinanothersystem
AnswerD.
AnswerCsoundscorrectalso,butadjacentandcorrespondingaretwodifferentthings.Thesessionlayercanonlycommunicatewiththesessionlayerinanothersystemforexample.
13.Whydoestheindustryusealayeredmodel?
Chooseallcorrect
A.Whenyouenhanceonelayeritdoesntaffecttheotherlayers
B.Designanddevelopmentcanbemadeinamodularfashion
C.Networkoperationscanbesimplified
D.Troubleshootingcanbesimplified.
14.Whichtwoofthefollowingarenotfromthephysicallayer?
A.SDLC
B.V.35
C.HSSI
D.ISDN
E.RS-232
AnswerAD.SDLCandISDNareWANprotocolsthatfunctionatthedatalinklayer
15.WhichtwoanswersarefunctionsoftheOSImodel"snetworklayer?
A.Sequencingofframes
B.Pathdetermination
C.Packetswitching
D.Packetsequencing
AnswerBC.Sequencingisdoneatthedatalinklayer.Disfictional.
16.WhatisanexampleofaMACaddress?
A.Az32:
6362:
2434
B.Sj:
2817:
8288
C.GGG:
354:
665
D.A625:
cbdf:
6525
Theaddressisa48bitaddresswhichrequires12Hexdigits.AhexdigitcantbepasttheletterF.Hexstandsfor16.1-9andA-Fmakeupnumbersthatarevalid.
17.Whichofthefollowingisnotpartofthedatalinklayer?
A.Transportsdataacrossthephysicallink
B.Performsphysicaladdressing
C.Performsflowcontrol
D.Determinesnetworktopology
E.Terminatesasession
Thisispartofthesessionlayer
18.Whichofthefollowingaredatalinkprotocols?
A.HDLC
B.FTP
C.SQL
D.ISDN
E.TokenRing
FTPisanapplicationandSQLisasessionlayerprotocol.
19.OfthefollowingaddressAA77:
3827:
EF54,whichofthefollowingisthevendorportion?
A.AA7738
B.27EF54
C.AA77
D.EF54
Thevendorcodeishowyoucantellwhomadethecard.Thelast6digitsarethephysicaladdress.
20.Whichofthefollowingareexamplesoflayer3addressing?
A.165.33.4.34
B.AA77:
3827:
EF54
C.HHHH:
hg:
7654
D.76
ThefirstisaTCPIPaddressandthesecondisanIPXaddress
21.WhatisconsideredLayer3addressing?
A.DataLinkLayer
B.NetworkLayer
C.ApplicationLayer
D.Noneofthese
PhysicalisLayer1,thendatalink,andthenNetwork.Thisisthesamelayerthatroutersareon.
22.WhatlayerareBridgeson?
A.DataLink
B.Physical
C.Application
D.Transport
Bridgessegmentnetworksbutarenotabletodetermineaddresseslikethenetworklayerdoes.
23.Repeatersareonwhatlayer?
A.Transport
B.Session
C.Physical
D.Application
Allrepeaterscandoisboostasignal.Anactivehubisagoodexampleofarepeater.Aswitchinghubisagoodexampleoflayer3addressing,sinceswitchesgobynetworkaddressesandIPXaddressesratherthanjustboostsignals.Bridgescanonlyreadmacaddresses,andnotthefullIPXorTCPIPaddresses.
24.Whichofthefollowingareconsideredroutingprotocols?
A.OSPF
B.IP
C.IPX
D.EIGRP
E.TokenRing
AnswersBandCareroutedprotocols,whereasAandDaretheprotocolsthatdotherouting.Thisiseasilyconfused.Youcanrememberitbythinkingthattheroutingprotocolsthathaultheroutedprotocolsarelikeatugshippullingabarge.Thebargeisfullofdata.
25.Whichtwoofthefollowingareconsideredconnectionorientedcommunication?
A.Setupandmaintenanceproceduresareperformedtoensuremessagedelievery
B.Aphysicalcircuitexistsbetweentwocommunicatingdevices
C.Itisabestefforttypeofcommunication
D.Avirtualconnectionexistsbetweenthetwo
Bisnotanecessity,andCisnotaccurate.TCPisconnectionorientedandUDPisnot
26.WhichofthefollowingarenotWANprotocols?
Choose2
A.FrameRelay
B.ATM
C.Ethernet
D.FDDI
E.ISDN
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
ROMwillbeusedifFlashisunavailable.NVRAMisthebackupconfiguration,andRAMistheactiveconfiguration
29.Whichofthefollowingindicatestherouterisinprivilegemode?
A.Router#
B.Router>
C.Router-
D.Router*AnswerBshowstherouterinusermode.
30.Whatdoes"showcdpneighbors"notshow?
Neighbors_________
A.deviceid
B.hardwareplatform
C.iosversion
D.porttypeandnumber
31.Whichofthefollowingwillshowyoutheclock?
A.cl?
B.Cl?
C.Clock?
D.Clock?
Bytypingthistherouterwillfinishthecommandandshowtheclock.
32.CDPoperatesatwhichlayer?
A.Transport
B.Network
C.Datalink
D.Physical
CDPallowsanetworkdevicetoexchangeframeswithotherdirectlyconnectednetworkeddevices.
33.Whichcommanddoesnotshowtwodevicesarenotroutingpacketsbetweenthemsuccessfully?
A.ping
B.showinterface
C.trace
D.telnet
AnswerACD.Withthesecommandsyoucantellwhetherornotyouhavecommunication.Showinterfacejustverifiesthereisaconnection
34.Whatkeystrokesshowsthepossiblecommandsinprivilegemode?
A.help
B.h
C.ctrl+h
D.?
AnswersAandBwillgiveabriefdescriptionwhentyped,andCisnotvalid.
35.Whichtwoitemscontainversionsoftheroutersconfigurationfile?
A.flash
B.nvram
C.ram
D.rom
AandDcontaintheOS.
36.WhichofthefollowingcommandswillallowyoutoreviewthecontentsofRAM?
A.showconfiguration
B.showprotocols
C.showversion
D.showrunning-config
E.showstartup-config
AandEallowyoutoseeNVRAM.
37.Whichofthefollowingwillallowyoutoadd,modify,ordeletecommandsinthestartupconfigurationfile?
A.showstartup-config
B.showrunning-config
C.configureterminal
D.configurememory
AnswerCallowsyoutochangeitemsintherunningconfigurationfile
38.WhichcommandwouldbeusedtorestoreaconfigurationfiletoRAM?
________TFTPrunning-config
A.router#copy
B.router>copy
C.router*copy
D.router^copy
Youmustbeinprivilegemodewhenexecutingthis,whichiswhyyouseethe#sign.
39.Whichofthefollowingcommandswilldisplaytherunningconfigurationfiletoaterminal?
A.showrunning-config
B.showrouter-config
C.router#showflash
D.router>showversion
Itcanonlybeshowninprivilegemode.
40.IfyouneedtocopythecurrentlyexecutingconfigurationfileintoNVRAM,whichcommandwouldyouuse?
A.router#copystartup-configrunning-config
B.router#copystartup-configTFTP
C.router#copyrunning-configstartup-config
D.router>copystartup-configrunning-config
AnswersABCshowthattherouterisinprivilegemodewhichisnecessarytocompletethisaction,butonlyCshowsthecorrectsyntax.
41Whichofthefollowingcom
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