《计算机网络》习题.doc

《计算机网络》习题.doc

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Chapter1ComputerNetworksandtheInternet

1.The（A）isaworldwidecomputernetwork,thatis,anetworkthatinterconnectsmillionsof

computingdevicesthroughouttheworld.

A.publicInternet

B.Intranet

C.switchnet

D.televisionnet

2.（D）Whichkindofmediaisnotaguidedmedia?

A.twisted-paircopperwire

B.acoaxialcable

C.fiberoptics

D.digitalsatellitechannel

3.Whichkindofmediaisaguidedmedia?

（C）

A.geostationarysatellite

B.low-altitudesatellite

C.fiberoptics

D.wirelessLAN

4.Theunitsofdataexchangedbyalink-layerprotocolarecalled（A）.

A.Frames

B.Segments

C.Datagrams

D.bitstreams

5.Whichofthefollowingoptionbelongstothecircuit-switchednetworks?

（D）

A.FDM

B.TDM

C.VCnetworks

D.bothAandB

6.（B）makessurethatneithersideofaconnectionoverwhelmstheothersidebysendingtoomanypacketstoofast.

A.Reliabledatatransfer

B.Flowcontrol

C.Congestioncontrol

D.Handshakingprocedure

7.（A）meansthattheswitchmustreceivetheentirepacketbeforeitcanbegintotransmitthefirstbitofthepacketontotheoutboundlink.

A.Store-and-forwardtransmission

B.FDM

C.End-to-endconnection

D.TDM

8.Datagramnetworksandvirtual-circuitnetworksdifferinthat（C）.

A.datagramnetworksarecircuit-switchednetworks,andvirtual-circuitnetworksare

packet-switchednetworks.

B.datagramnetworksarepacket-switchednetworks,andvirtual-circuitnetworksare

circuit-switchednetworks.

C.datagramnetworksusedestinationaddressesandvirtual-circuitnetworksuseVC.

numberstoforwardpacketstowardtheirdestination.

D.datagramnetworksuseVC.numbersandvirtual-circuitnetworksusedestinationaddressestoforwardpacketstowardtheirdestination.

9.Inthefollowingoptions,whichoneisnotaguidedmedia?

（D）

A.twisted-pairwire

B.fiberoptics

C.coaxialcable

D.satellite

10.Processingdelaydoesnotincludethetimeto（B）.

A.examinethepacket’sheader

B.waittotransmitthepacketontothelink

C.determinewheretodirectthepacket

D.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.datagram

C.segment

D.message

13.Theprotocolsofvariouslayersarecalled（A）.

A.theprotocolstack

B.TCP/IP

C.ISP

D.networkprotocol

14.Therearetwoclassesofpacket-switchednetworks:

（A）networksandvirtual-circuit

networks.

A.datagram

B.circuit-switched

C.television

D.telephone

15.Accessnetworkscanbelooselyclassifiedintothreecategories:

residentialaccess,

companyaccessand（B）access.

A.cabled

B.wireless

C.campus

D.cityarea

Question16～17

Suppose,aistheaveragerateatwhichpacketsarriveatthequeue,Risthetransmissionrate,andallpacketsconsistofLbits,thenthetrafficintensityis（16:

B）,anditshouldnogreaterthan（17:

B）.

16.A.LR／a17.A.2

B.La／RB.1

C.Ra／LC.0

D.LR／aD.1

18.IntheInternet,theequivalentconcepttoendsystemsis（A）.

A.hosts

B.servers

C.clients

D.routers

19.IntheInternet,endsystemsareconnectedtogetherby（C）.

A.copperwire

B.coaxialcable

C.communicationlinks

D.fiberoptics

20.EndsystemsaccesstotheInternetthroughits（C）.

A.modems

B.protocols

C.ISP

D.sockets

21.Endsystems,packetswitches,andotherpiecesoftheInternet,run（D）thatcontrolthe

sendingandreceivingofinformationwithintheInternet.

A.programs

B.processes

C.applications

D.protocols

22.Therearemanyprivatenetworks,suchasmanycorporateandgovernmentnetworks,

whosehostscannotexchangemessageswithhostsoutsideoftheprivatenetwork.These

privatenetworksareoftenreferredtoas（C）.

A.internets

B.LAN

C.intranets