《计算机网络》习题.docx

《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