学年秋.docx
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学年秋.docx
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学年秋
浙江大学2005–2006学年秋季学期
《计算机网络》课程期末考试试卷
开课学院:
软件学院,考试形式:
闭卷
考试时间:
_____年____月____日,所需时间:
120分钟
考生姓名:
___学号:
专业:
得分:
答案:
题号
答案
得分
1-10
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90
91-100
Foreveryfollowingquestion,pleaseselectyourbestansweronly!
!
!
1.Thetransmissionunitforthephysicallayerisa/an__________.
A.)packet
B.)frame
C.)bit
D.)byte
2.Whichbestdescribesthestructureofanencapsulateddatapacket?
A.)Segmentheader,networkheader,data,frametrailer
B.)Segmentheader,networkheader,data,segmenttrailer
C.)Frameheader,networkheader,data,frametrailer
D.)Frameheader,segmentheader,data,segmenttrailer
3.Thecommunicationsubnetconsistsof__________.
A.)physicallayer,datalinklayer,andnetworklayer
B.)physicallayer,networklayer,transportlayer
C.)physicallayer,datalinklayer,networklayer,transportlayer
D.)datalinklayer,networklayer,transportlayer,sessionlayer
4.WhichofthefollowingstatementsbestdescribesaWAN?
A.)ItconnectsLANsthatareseparatedbyalargegeographicarea.
B.)Itconnectsworkstations,terminals,andotherdevicesinametropolitanarea.
C.)ItconnectsLANswithinalargebuilding.
D.)Itconnectsworkstations,terminals,andotherdeviceswithinabuilding.
5.Whichisthemovementofdatathroughlayers?
A.)Wrapping
B.)Encapsulation
C.)Traveling
D.)Transmission
6.WhichistheOSImodel?
A.)Aconceptualframeworkthatspecifieshowinformationtravelsthroughnetworks.
B.)Amodelthatdescribeshowdatamakeitswayfromoneapplicationprogramtoanotherthroughoutanetwork.
C.)Aconceptualframeworkthatspecifieswhichnetworkfunctionsoccurateachlayer
D.)Alloftheabove
7.WhichoftheOSIlayersdividesthetransmittedbitstreamintoframes?
A.)Physicallayer
B.)Datalinklayer
C.)Networklayer
D.)Transportlayer
8.Whichofthefollowingisincorrect?
A.)TheOSImodelisbettertheTCP/IPmodel.
B.)TheOSImodelprovidesmoreefficientimplementationthantheTCP/IPmodel.
C.)TheOSImodelhasmorelayersthantheTCP/IPmodel.
D.)TheOSImodelmakesthedistinctionbetweenservices,interfaces,protocols.
9.IntheTCP/IPmodel,whichlayerdealswithreliability,flowcontrol,anderrorcorrection?
A.)Application
B.)Transport
C.)Internet
D.)Networkaccess
10.TheTCP/IPprotocolsuitehasspecificationsforwhichlayersoftheOSImodel?
A.)1through3
B.)1through4and7
C.)3,4,and5through7
D.)1,3,and4
11.Anoiseless4-kHzchannelissampledevery1msec.Whatisthemaximumdatarate?
A.)8000bps
B.)4000bps
C.)1000bps
D.)Canbeinfinite
12.Ifabinarysignalissentovera4-kHzchannel,whatisthemaximumachievabledatarate?
A.)8000bps
B.)4000bps
C.)1000bps
D.)Canbeinfinite
13.Ifabinarysignalissentovera4-kHzchannelwhosesignal-to-noiseratiois127:
1,whatisthemaximumachievabledatarate?
A.)28000bps
B.)8000bps
C.)4000bps
D.)Canbeinfinite
14.Amodemconstellationdiagramhasdatapointsatthefollowingcoordinates:
(1,1),(1,-1),(-1,1),and(-1,-1).Howmanybpscanamodemwiththeseparametersachieveat1200baud?
A.)1200bps
B.)2400bps
C.)4800bps
D.)Noneoftheabove
15.WhatisWDM?
A.)Multiplexingonfiber-opticcable.
B.)Multiplexingusingthedensityofthetransmissionmedia.
C.)AformofflowcontrolthatmonitorsWANdelays.
D.)AformofcongestionmanagementforWANs.
16.Whichtechnologyisnotatypeofwirelesscommunication?
A.)Cellular
B.)Broadband
C.)Infrared
D.)Spreadspectrum
17.Whatisoneadvantageofusingfiberopticcableinnetworks?
A.)Itisinexpensive.
B.)Itiseasytoinstall.
C.)Itisanindustrystandardandisavailableatanyelectronicsstore
D.)Itiscapableofhigherdataratesthaneithercoaxialortwisted-paircable.
18.Atelephoneswitchisakindof__________.
A.)packet-switching
B.)buffer-switching
C.)fabric-switching
D.)circuit-switching.
19.AcableTVsystemhas100commercialchannels,allofthemalternatingprogramswithadvertising.Thiskindofmultiplexinguses___________.
A.)TDM
B.)FDM
C.)FDM+TDM
D.)Noneoftheabove.
20.Abitstring,01101111101111110,needstobetransmittedatthedatalinklayer.Whatisthestringactuallytransmittedafterbitstuffing(Wheneverthesender’sdatalinklayerencountersfiveconsective1sinthedata,itautomaticallystuffsa0bitintotheoutgoingbitstream)
A.)01101111101111110
B.)0110111110011111010
C.)011011111011111010
D.)Noneoftheabove
21.WhenDCF(DistributedCoordinationFunction)isemployed,802.11usesaprotocolcalled__________.
A.)CSMA/CA
B.)CSMA/CD
C.)ALOHA
D.)WDMA
22.WhichofthefollowingcanNOTdirectlybeusedforframing?
A.)Charactercount.
B.)Flagbyteswithbytestuffing.
C.)Startingandendingflags,withbitstuffing.
D.)Physicallayercodingviolations.
23.WhichofthefollowingcanaVLANbeconsidered?
A.)Broadcastdomain
B.)Collisiondomain
C.)Bothabroadcastandacollisiondomain
D.)Domainname
24.WhatisthepurposeofSpanningTreeProtocol?
(NetworkBridging)
A.)Tomaintainsinglelooppaths
B.)Tomaintainaloop-freenetwork
C.)Tomaintainamultiloopnetwork
D.)Tomaintainareducedloopnetwork
25.Whichusesthetwistedpairs?
A.)10Base5.
B.)10Base2.
C.)10Base-F.
D.)10Base-T.
26.Howdoswitcheslearntheaddressesofdevicesthatareattachedtotheirports?
A.)Switchesgetthetablesfromarouter.
B.)Switchesreadthesourceaddressofapacketthatisenteringthroughaport.
C.)Switchesexchangeaddresstableswithotherswitches.
D.)Switchesarenotcapableofbuildingaddresstables.
27.Repeaterscanprovideasimplesolutionforwhatproblem?
A.)Toomanytypesofincompatibleequipmentonthenetwork
B.)Toomuchtrafficonanetwork
C.)Too-slowconvergencerates
D.)Toomuchdistancebetweennodesornotenoughcable.
28.Whichofthefollowingistrueofaswitch’sfunction?
A.)Switchesincreasethesizeofacollisiondomains.
B.)SwitchescombinetheconnectivityofahubwiththecapabilitytofilterorfloodtrafficbasedonthedestinationMACaddressoftheframe.
C.)Switchescombinetheconnectivityofahubwiththetrafficdirectionofarouter.
D.)SwitchesperformLayer4pathselection.
29.EthernetMACaddressesarehowmanybitsinlength?
A.)12
B.)24
C.)48
D.)64
30.Whatistheinformationthatis“burnedin”toanetworkinterfacecard?
A.)NIC
B.)MACaddress
C.)Hub
D.)LAN
31.WhichconnectordoesUTP(UnshieldTwisedPair)use?
A.)STP
B.)RJ-45
C.)RJ-69
D.)BNC
32.Usingrepeatersdoeswhichofthefollowingtothecollisiondomain?
A.)Reduces
B.)Hasnoeffecton
C.)Extends
D.)Noneoftheabove
33.Whichofthefollowingisnotafeatureofmicrosegmentation?
A.)Itenablesdedicatedaccess.
B.)Itsupportsmultipleconversionsatanygiventime.
C.)Itincreasesthecapacityforeachworkstationconnectedtothenetwork.
D.)Itincreasescollisions.
34.Whichofthefollowingprotocolswouldhavethehighestchannelutilization?
A.)0.5-persistentCSMA
B.)1-persistentCSMA
C.)PureALOHA
D.)SlottedALOHA
35.Whichofthefollowingistrueconcerningabridgeanditsforwardingdecisions?
A.)BridgesoperateatOSILayer2anduseIPaddressestomakedecisions.
B.)BridgesoperateatOSILayer3anduseIPaddressestomakedecisions.
C.)BridgesoperateatOSILayer2anduseMACaddressestomakedecisions.
D.)BridgesoperateatOSILayer3anduseMACaddressestomakedecisions.
36.FastEthernetsupportsuptowhattransferrate?
A.)5Mbps
B.)10Mbps
C.)100Mbps
D.)1000Mbps
37.MediaAccessControlreferstowhat?
A.)ThestateinwhichaNIChascapturedthenetworkingmediumandisreadytotransmit
B.)Rulesthatgovernmediacaptureandrelease
C.)Rulesthatdeterminewhichcomputeronashared-mediumenvironmentisallowedtotransmitthedata
D.)Aformalbytesequencethathasbeentransmitted.
38.WhichbestdescribesaCSMA/CDnetwork?
A.)Onenode’stransmissiontraversestheentirenetworkandisreceivedandexaminedbyeverynode.
B.)SignalsaresentdirectlytothedestinationifthesourceknowsboththeMACandIPaddresses
C.)Onenode’stransmissiongoestothenearestrouter,whichsendsitdirectlytothedestination.
D.)Signalsalwaysaresentinbroadcastmode.
39.WhichofthefollowingstatementsaboutIPv4headerfieldsisincorrect?
A.)Anaddresshas32bits.
B.)TheTTLhas4bits.
C.)Theversionhas4bits.
D.)Theidentificationhas16bits.
40.ThesubnetmaskforaclassBnetworkis255.255.255.192.Howmanysubnetworksareavailable?
(Disregardspecialaddresses)
A.)2
B.)4
C.)1024
D.)192
41.Whichofthefollowingcanbeusedtoconnectakeyboardwithacomputer?
A.)802.3
B.)802.11
C.)802.15
D.)802.16
42.Whichofthefollowingcanbeusedasthewirelesslocalloopforpublicswitchedtelephonesystems?
A.)802.3
B.)802.11
C.)802.15
D.)802.16
43.WhatistheIPaddressoftheinternalloopback?
A.)10.10.10.1
B.)255.255.255.0
C.)127.0.0.1
D.)192.0.0.1
44.Howdoesthenetworklayerforwardpacketsfromthesourcetothedestination?
A.)ByusinganIProutingtable
B.)ByusingARPresponses
C.)Byreferringtoanameserver
D.)Byreferringtothebridge
45.Whatisoneadvantageofdynamicrouting?
A.)Takeslittlenetworkoverheadandreducesnetworktraffic
B.)Reduc
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