计算机网络英文题库附答案chapterWord格式.docx
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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
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?
Atheformatofmessagesexchangedbetweentwoormorecommunicatingentities
Btheorderofmessagesexchangedbetweentwoormorecommunicatingentities
Ctheactionstakenonthetransmissionofamessageorotherevent
Dthetransmissionsignalsaredigitalsignalsoranalogsignals
27.Inthefollowingoptions,whichisdefinedinprotocol?
Atheactionstakenonthetransmissionand/orreceiptofamessageorotherevent
Btheobjectsexchangedbetweencommunicatingentities
Cthecontentintheexchangedmessages
Dthelocationofthehosts
28.Inthefollowingoptions,whichdoesnotbelongtothenetworkedge?
Aendsystems
Brouters
Cclients
Dservers
29.Inthefollowingoptions,whichbelongstothenetworkcore?
Aendsystems
30.Inthefollowingoptions,whichisnotthebundledwiththeInternet’sconnection-orientedservice?
Areliabledatatransfer
Bguaranteeofthetransmissiontime
Cflowcontrol
Dcongestion-control
31.Anapplicationcanrelyontheconnectiontodeliverallofitsdatawithouterrorandintheproperorder.Thesentencedescribes().
Bcongestion-control
Creliabledatatransfer
Dconnection-orientedservice
32.Itmakessurethatneithersideofaconnectionoverwhelmstheothersidebysendingtoomanypacketstoofast.Thesentencedescribes().
Cconnection-orientedservice
Dreliabledatatransfer
33.IthelpspreventtheInternetfromenteringastateofgridlock.Whenapacketswitchbecomescongested,itsbufferscanoverflowandpacketlosscanoccur.Thesentencedescribes().
34.TheInternet’sconnection-orientedservicehasaname,itis().
ATCP
BUDP
CTCP/IP
DIP
35.Inthefollowingoptions,whichservicedoesnotbeprovidedtoanapplicationbyTCP?
()
Areliabletransport
Bflowcontrol
Cvideoconferencing
Dcongestioncontrol
36.TheInternet’sconnectionlessserviceiscalled().
37.Inthefollowingoptions,whichdoesnotuseTCP?
ASMTP
Binternettelephone
CFTP
DHTTP
38.Inthefollowingoptions,whichdoesnotuseUDP?
AInternetphone
Bvideoconferencing
Cstreamingmultimedia
Dtelnet
39.Therearetwofundamentalapproachestobuildinganetworkcore,()andpacketswitching.
Aelectricalcurrentswitching
Bcircuitswitching
Cdataswitching
Dmessageswitching
40.In()networks,theresourcesneededalongapathtoprovideforcommunicationbetweentheendsystemarereservedforthedurationofthecommunicationsession.
Apacket-switched
Bdata-switched
Ccircuit-switched
Dmessage-switched
41.In()networks,theresourcesarenotreserved;
asession’smessagesusetheresourcesondemand,andasaconsequence,mayhavetowaitforaccesstocommunicationlink.
Apacket-switched
42.Inacircuit-switchednetwork,ifeachlinkhasncircuits,foreachlinkusedbytheend-to-endconnection,theconnectiongets()ofthelink’sbandwidthforthedurationoftheconnection.
Aafraction1/n
Ball
C1/2
Dntimes
43.For(),thetransmissionrateofacircuitisequaltotheframeratemultipliedbythenumberofbitsinaslot.
ACDMA
Bpacket-switchednetwork
CTDM
DFDM
44.()meansthattheswitchmustreceivetheentirepacketbeforeitcanbegintotransmitthefirstbitofthepacketontotheoutboundlink.
AQueuingdelay
BStore-and-forwardtransmission
CPacketloss
DPropagation
45.Thenetworkthatforwardspacketsaccordingtohostdestinationaddressesiscalled()network.
Acircuit-switched
Bpacket-switched
Cvirtual-circuit
Ddatagram
46.Thenetworkthatforwardspacketsaccordingtovirtual-circuitnumbersiscalled()network.
Acircuit-switched
47.Inthefollowingentries,whichisnotakindofaccessnetwork?
Aresidentialaccess
Bcompanyaccess
Cwirelessaccess
Dlocalaccess
48.Supposethereisexactlyonepacketswitchbetweenasendinghostandareceivinghost.ThetransmissionratesbetweenthesendinghostandtheswitchandbetweentheswitchandthereceivinghostareR1andR2,respectively.Assumingthattheswitchusesstore-and-forwardpacketswitching,whatisthetotalend-to-enddelaytosendapacketoflengthL?
(Ignorequeuingdelay,propagationdelay,andprocessingdelay.)()
AL/R1+L/R2
BL/R1
CL/R2
Dnoneoftheabove
49.Thetimerequiredtoexaminethepacket’sheaderanddeterminewheretodirectthepacketispartofthe().
Aqueuingdelay
Bprocessingdelay
Cpropagationdelay
Dtransmissiondelay
50.Thetimerequiredtopropagatefromthebeginningofthelinktothene