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.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
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