《计算机网络》习题.docx
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《计算机网络》习题.docx
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Chapter1 ComputerNetworksandtheInternet
1.The(A)isaworldwidecomputernetwork,thatis,anetworkthatinterconnectsmillionsofcomputingdevicesthroughouttheworld.
A.publicInternetB.IntranetC.switchnetD.televisionnet
2.(D)Whichkindofmediaisnotaguidedmedia?
A.twisted-paircopperwire
B.acoaxialcableC.fiberoptics
D.digitalsatellitechannel
3.Whichkindofmediaisaguidedmedia?
(C)A.geostationarysatellite
B.low-altitudesatelliteC.fiberoptics
D.wirelessLAN
4.Theunitsofdataexchangedbyalink-layerprotocolarecalled(A).
A.FramesB.SegmentsC.DatagramsD.bitstreams
5.Whichofthefollowingoptionbelongstothecircuit-switchednetworks?
(D)A.FDM
B.TDM
C.VCnetworks
D.bothAandB
6.(B)makessurethatneithersideofaconnectionoverwhelmstheothersidebysendingtoomanypacketstoofast.
A.Reliabledatatransfer
B.FlowcontrolC.CongestioncontrolD.Handshakingprocedure
7.(A)meansthattheswitchmustreceivetheentirepacketbeforeitcanbegintotransmitthefirstbitofthepacketontotheoutboundlink.
A.Store-and-forwardtransmissionB.FDM
C.End-to-endconnectionD.TDM
8.Datagramnetworksandvirtual-circuitnetworksdifferinthat(C).
A.datagramnetworksarecircuit-switchednetworks,andvirtual-circuitnetworksarepacket-switchednetworks.
B.datagramnetworksarepacket-switchednetworks,andvirtual-circuitnetworksarecircuit-switchednetworks.
C.datagramnetworksusedestinationaddressesandvirtual-circuitnetworksuseVC.numberstoforwardpacketstowardtheirdestination.
D.datagramnetworksuseVC.numbersandvirtual-circuitnetworksusedestinationaddressestoforwardpacketstowardtheirdestination.
9.Inthefollowingoptions,whichoneisnotaguidedmedia?
(D)A.twisted-pairwire
B.fiberoptics
C.coaxialcableD.satellite
10.Processingdelaydoesnotincludethetimeto(B).
A.examinethepacket’sheader
B.waittotransmitthepacketontothelinkC.determinewheretodirectthepacketD.checkbit-errorinthepacket
11.Inthefollowingfourdescriptions,whichoneiscorrect?
(C)A.Thetrafficintensitymustbegreaterthan1.
B.Thefractionoflostpacketsincreasesasthetrafficintensitydecreases.
C.Ifthetrafficintensityisclosetozero,theaveragequeuingdelaywillbeclosetozero.
D.Ifthetrafficintensityisclosetoone,theaveragequeuingdelaywillbeclosetoone.12.TheInternet’snetworklayerisresponsibleformovingnetwork-layerpacketsknownas
(B)fromonehosttoanother.A.frame
B.datagramC.segmentD.message
13.Theprotocolsofvariouslayersarecalled(A).
A.theprotocolstackB.TCP/IP
C.ISP
D.networkprotocol
14.Therearetwoclassesofpacket-switchednetworks:
(A)networksandvirtual-circuitnetworks.
A.datagramB.circuit-switchedC.televisionD.telephone
15.Accessnetworkscanbelooselyclassifiedintothreecategories:
residentialaccess,
companyaccessand(B)access.
A.cabledB.wirelessC.campus
D.cityareaQuestion16~17
Suppose,aistheaveragerateatwhichpacketsarriveatthequeue,Risthetransmissionrate,andallpacketsconsistofLbits,thenthetrafficintensityis(16:
B),anditshouldnogreaterthan(17:
B).
16. A.LR/a 17.A.2
B.La/R B.1
C.Ra/L C.0
D.LR/a D.1
18.IntheInternet,theequivalentconcepttoendsystemsis(A).
A.hostsB.serversC.clientsD.routers
19.IntheInternet,endsystemsareconnectedtogetherby(C).
A.copperwire
B.coaxialcableC.communicationlinksD.fiberoptics
20.EndsystemsaccesstotheInternetthroughits(C).
A.modemsB.protocolsC.ISP
D.sockets
21.Endsystems,packetswitches,andotherpiecesoftheInternet,run(D)thatcontrolthesendingandreceivingofinformationwithintheInternet.
A.programsB.processesC.applicationsD.protocols
22.Therearemanyprivatenetworks,suchasmanycorporateandgovernmentnetworks,whosehostscannotexchangemessageswithhostsoutsideoftheprivatenetwork.Theseprivatenetworksareoftenreferredtoas(C).
A.internetsB.LAN
C.intranetsD.WAN
23.Theinternetallows(D)runningonitsendsystemstoexchangedatawitheachother.
A.clientsapplications
B.serverapplicationsC.P2PapplicationsD.distributedapplications
24.TheInternetprovidestwoservicestoitsdistributedapplications:
aconnectionless
unreliableserviceand(B)service.
A.flowcontrol
B.connection-orientedreliableC.congestioncontrol
D.TCP
25.Itdefinestheformatandtheorderofmessagesexchangedbetweentwoormorecommunicatingentities,aswellastheactionstakenonthetransmissionand/orreceiptofamessageorotherevent.Thesentencedescribes(B).
A.InternetB.protocolC.intranetD.network
26.Inthefollowingoptions,whichdoesnotdefineinprotocol?
(D)
A.theformatofmessagesexchangedbetweentwoormorecommunicatingentities
B.theorderofmessagesexchanged
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