计算机网络英文题库附答案chater.docx

计算机网络英文题库附答案chater.docx

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计算机网络英文题库附答案chater

Chapter1ComputerNetworksandtheInternet

1．The（）isaworldwidecomputernetwork,thatis,anetworkthatinterconnectsmillionsofcomputingdevicesthroughouttheworld.ppt3

ApublicInternet

BIntranet

Cswitchnet

Dtelevisionnet

2．Whichkindofmediaisnotaguidedmedia（）

Atwisted-paircopperwire

Bacoaxialcable

Cfiberoptics

Ddigitalsatellitechannel

3．Whichkindofmediaisaguidedmedia（）

Ageostationarysatellite

Blow-altitudesatellite

Cfiberoptics

DwirelessLAN

4．Theunitsofdataexchangedbyalink-layerprotocolarecalled（）.

AFrames

BSegments

CDatagrams

Dbitstreams

5．Whichofthefollowingoptionbelongstothecircuit-switchednetworks（）

AFDM

BTDM

CVCnetworks

DbothAandB

6．（）makessurethatneithersideofaconnectionoverwhelmstheothersidebysendingtoomanypacketstoofast.

AReliabledatatransfer

BFlowcontrol

CCongestioncontrol

DHandshakingprocedure

7．（）meansthattheswitchmustreceivetheentirepacketbeforeitcanbegintotransmitthefirstbitofthepacketontotheoutboundlink.

AStore-and-forwardtransmission

BFDM

CEnd-to-endconnection

DTDM

8．Datagramnetworksandvirtual-circuitnetworksdifferinthat（）.

Adatagramnetworksarecircuit-switchednetworks,andvirtual-circuitnetworksarepacket-switchednetworks.

Bdatagramnetworksarepacket-switchednetworks,andvirtual-circuitnetworksarecircuit-switchednetworks.

Cdatagramnetworksusedestinationaddressesandvirtual-circuitnetworksuseVC.numberstoforwardpacketstowardtheirdestination.

DdatagramnetworksuseVC.numbersandvirtual-circuitnetworksusedestinationaddressestoforwardpacketstowardtheirdestination.

9．Inthefollowingoptions,whichoneisnotaguidedmedia（）

Atwisted-pairwire

Bfiberoptics

Ccoaxialcable

Dsatellite

10．Processingdelaydoesnotincludethetimeto（）.

Aexaminethepacket’sheader

Bwaittotransmitthepacketontothelink

Cdeterminewheretodirectthepacket

Dcheckbit-errorinthepacket

11．Inthefollowingfourdescriptions,whichoneiscorrect（）

AThetrafficintensitymustbegreaterthan1.

BThefractionoflostpacketsincreasesasthetrafficintensitydecreases.

CIfthetrafficintensityisclosetozero,theaveragequeuingdelaywillbeclosetozero.

DIfthetrafficintensityisclosetoone,theaveragequeuingdelaywillbeclosetoone.

12．TheInternet’snetworklayerisresponsibleformovingnetwork-layerpacketsknownas（）fromonehosttoanother.

Aframe

Bdatagram

Csegment

Dmessage

13．Theprotocolsofvariouslayersarecalled（）.

Atheprotocolstack

BTCP/IP

CISP

Dnetworkprotocol

14．Therearetwoclassesofpacket-switchednetworks:

（）networksandvirtual-circuitnetworks.

Adatagram

Bcircuit-switched

Ctelevision

Dtelephone

15．Accessnetworkscanbelooselyclassifiedintothreecategories:

residentialaccess,companyaccessand（）access.

Acabled

Bwireless

Ccampus

Dcityarea

Question16～17

Suppose,aistheaveragerateatwhichpacketsarriveatthequeue,Risthetransmissionrate,andallpacketsconsistofLbits,thenthetrafficintensityis（16）,anditshouldnogreaterthan（17）.

16．ALR／a

BLa／R

CRa／L

DLR／a

17．A2

B1

C0

D-1

18．IntheInternet,theequivalentconcepttoendsystemsis（）.

Ahosts

Bservers

Cclients

Drouters

19．IntheInternet,endsystemsareconnectedtogetherby（）.

Acopperwire

Bcoaxialcable

Ccommunicationlinks

Dfiberoptics

20．EndsystemsaccesstotheInternetthroughits（）.

Amodems

Bprotocols

CISP

Dsockets

21．Endsystems,packetswitches,andotherpiecesoftheInternet,run（）thatcontrolthesendingandreceivingofinformationwithintheInternet.

Aprograms

Bprocesses

Capplications

Dprotocols

22．Therearemanyprivatenetworks,suchasmanycorporateandgovernmentnetworks,whosehostscannotexchangemessageswithhostsoutsideoftheprivatenetwork.Theseprivatenetworksareoftenreferredtoas（）.

Ainternets

BLAN

Cintranets

DWAN

23．Theinternetallows（）runningonitsendsystemstoexchangedatawitheachother.

Aclientsapplications

Bserverapplications

CP2Papplications

Ddistributedapplications

24．TheInternetprovidestwoservicestoitsdistributedapplications:

aconnectionlessunreliableserviceand（）service.

Aflowcontrol

Bconnection-orientedreliable

Ccongestioncontrol

DTCP

25．Itdefinestheformatandtheorderofmessagesexchangedbetweentwoormorecommunicatingentities,aswellastheactionstakenonthetransmissionand/orreceiptofamessageorotherevent.Thesentencedescribes（）.

AInternet

Bprotocol

Cintranet

Dnetwork

26．Inthefollowingoptions,whichdoesnotdefineinprotocol（）

Atheformatofmessag