计算机网络英语期末复习试题及答案Word格式.docx
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DTheactionstakenbyalink-layerprotocolwhensendingandreceivingframesincludeerrordetection,flowcontrolandrandomaccess.
5.Whichofthefollowingservicescannotofferedbyalink-layerprotocol?
Acongestioncontrol
BLinkAccess
CErrorcontrol
DFraming
6.()protocolservestocoordinatetheframetransmissionsofthemanynodeswhenmultiplenodesshareasinglebroadcastlink.
AARP
BMAC
CICMP
DDNS
7.Inthefollowingfourdescriptionsabouttheadapter,whichoneisnotcorrect?
ATheadapterisalsocalledasNIC.
BTheadapterisasemi-autonomousunit.
CThemaincomponentsofanadapterarebusinterfaceandthelinkinterface.
DTheadaptercanprovideallthelink-layerservices.
8.ConsiderCRCerrorcheckingapproach,thefourbitgeneratorGis1011,andsupposethatthedataDis10101010,thenthevalueofRis().
A010
B100
C011
D110
9.Inthefollowingfourdescriptionsaboutrandomaccessprotocol,whichoneisnotcorrect?
AInslottedALOHA,nodescantransmitatrandomtime.
BInpureALOHA,ifaframeexperiencesacollision,thenodewillimmediatelyretransmititwithprobabilityp.
CThemaximumefficiencyofaslottedALOHAishigherthanapureALOHA.
DInCSMA/CD,onenodelistenstothechannelbeforetransmitting.
10.InthefollowingdescriptionsaboutMACaddress,whichoneisnotcorrect?
ATheMACaddressistheaddressofonenode’sadapter.
BNotwoadaptershavethesameMACaddress.
CTheMACaddressdoesn’tchangenomatterwheretheadaptergoes.
DMACaddresshasahierarchicalstructure.
11.TheARPprotocolcantranslate()into().()
Ahostname,IPaddress
Bhostname,MACaddress
CIPaddress,MACaddress
Dbroadcastaddress,IPaddress
12.ThevalueofPreamblefieldinEthernetframestructureis()
A1010101010101010……1010101011111111
B1010101110101011……1010101110101011
C1010101010101010……1010101010101011
D1010101010101010……1010101010101010
13.TherearefourstepsinDHCP,theDHCPservercancomplete().
ADHCPserverdiscovery
BDHCPserveroffers
CDHCPrequest
DDHCPresponse
14.InCSMA/CD,theadapterwaitssometimeandthenreturnstosensingthechannel.Inthefollowingfourtimes,whichoneisimpossible?
A0bittimes
B512bittimes
C1024bittimes
D1028bittimes
15.ThemostcommonEthernettechnologiesare10BaseTand100BaseT.“10”and“100”indicate().
Athemaximumlengthbetweentwoadapters
Btheminimumlengthbetweentwoadapters
Cthetransmissionrateofthechannel
Dthetransmissionrateofthenode
16.TheprincipalcomponentsofPPPincludebutnot().
Aframing
Bphysical-controlprotocol
Clink-layerprotocol
Dnetwork-layerprotocol
17.Inthefollowingfouroptions,whichservicecannotbeprovidedbyswitch?
Afiltering
Bself-learning
Cforwarding
Doptimalrouting
18.Inthefollowingfourservices,whichonewasberequiredinPPP?
Apacketframing
Berrordetection
Cerrorcorrection
Dmultipletypesoflink
19.Theabilitytodeterminetheinterfacestowhichaframeshouldbedirected,andthendirectingtheframetothoseinterfacesis().
Afiltering
Bforwarding
Cself-learning
20.In()transmission(s),thenodesatbothendsofalinkmaytransmitpacketsatthesametime.
Afull-duplex
Bhalf-duplex
Csingle-duplex
Dbothfull-duplexandhalf-duplex
21.ConsiderthedataDis01110010001,ifuseevenparitycheckingapproach,theparitybitis(①),ifuseoddparitycheckingapproach,theparitybitis(②).()
A①0②1
B①0②0
C①1②1
D①1②0
22.Inthefollowingfourdescriptionsaboutparitychecks,whichoneiscorrect?
ASingle-bitparitycandetectallerrors.
BSingle-bitparitycancorrectoneerrors.
CTwo-dimensionalparitynotonlycandetectasinglebiterror,butalsocancorrectthaterror.
DTwo-dimensionalparitynotonlycandetectanycombinationoftwoerrors,butalsocancorrectthem.
23.MACaddressis()bitslong.
A32
B48
C128
D64
24.WirelessLANusingprotocol().
AIEEE802.3
BIEEE802.4
CIEEE802.5
DIEEE802.11
25.Thefollowingprotocolsarebelongingtomultipleaccessprotocolsexceptfor().
Achannelpartitioningprotocols
Broutingprotocols
Crandomaccessprotocols
Dtaking-turnsprotocols
26.Whichofthefollowingisnotbelongingtochannelpartitioningprotocols?
ACSMA
BFDM
CCDMA
DTDM
27.InthefollowingfourdescriptionsaboutCSMA/CD,whichoneisnotcorrect?
AAnodelistenstothechannelbeforetransmitting.
BIfsomeoneelsebeginstalkingatthesametime,stoptalking.
CAtransmittingnodelistenstothechannelwhileitistransmitting.
DWithCSMA/CD,thecollisionscanbeavoidedcompletely.
28.()providesamechanismfornodestotranslateIPaddressestolink-layeraddress.
AIP
BARP
CRARP
29.AMACaddressisa()address.
Aphysical-layer
Bapplication-layer
Clink-layer
Dnetwork-layer
30.Whichofthefollowingiscorrect?
ANotwoadaptershavethesameMACaddress.
BMACbroadcastaddressisFF-FF-FF-FF-FF-FF.
CAportablecomputerwithanEthernetcardalwayshasthesameMACaddress,nomatterwherethecomputergoes.
DAlloftheabove
31.Inthefollowingfourdescriptions,whichoneisnotcorrect?
AARPresolvesanIPaddresstoaMACaddress.
BDNSresolveshostnamestoIPaddresses.
CDNSresolveshostnamesforhostsanywhereintheInternet.
DARPresolvesIPaddressesfornodesanywhereintheInternet.
32.IntheLAN,()protocoldynamicallyassignIPaddressestohosts.
ADNS
CDHCP
33.DHCPprotocolisafour-stepprocess:
①DHCPrequest.②DHCPACK.③DHCPserverdiscovery.④DHCPserveroffer(s).Thecorrectsequenceis()
A①②③④
B③②①④
C③④①②
D①④③②
34.IntheEthernetframestructure,theCRCfieldis()bytes.
A2
B4
C8
D32
35.IntheEthernetframestructure,theDatafieldcarriesthe().
AIPdatagram
Bsegment
Cframe
Dmessage
36.Inthefollowingfourdescriptions,whichoneisnotcorrect?
AEthernetusesbasebandtransmission.
BAlloftheEthernettechnologiesprovideconnection-orientedreliableservicetothenetworklayer.
CTheEthernet10Base2technologyusesathincoaxialcableforthebus.
DTheEthernet10BaseTtechnologyusesastartopology.
37.Ethernet’smultipleaccessprotocolis().
ACDMA
BCSMA/CD
CslottedALOHA
Dtoken-passingprotocol
38.InthefollowingfourdescriptionsaboutCSMA/CD,whichoneisnotcorrect?
AAnadaptermaybegintotransmitatanytime.
BAnadapternevertransmitsaframewhenitsensesthatsomeotheradapteristransmitting.
CAtransmittingadapterabortsitstransmissionassoonasitdetectsthatanotheradapterisalsotransmitting.
DAnadapterretransmitswhenitdetectsacollision.
39.WhichofthefollowingdescriptionsaboutCSMA/CDiscorrect?
ANoslotsareused.
BItusescarriersensing.
CItusescollisiondetection.
DAlloftheabove.
40.TheEthernet10BaseTtechnologyuses()asitsphysicalmedia.
Afiberoptics
Btwisted-paircopperwire
Ccoaxialcable
Dsatelliteradiochannel
41.For10BaseT,themaximumlengthoftheconnectionbetweenanadapterandthehubis()meters.
A100
B200
C500
D10
42.A()isaphysical-layerdevicethatactsonindividualbitsratherthanonframes.
Aswitch
Bhub
Crouter
Dgateway
43.Ahubisa()devicethatactsonindividualbitsratherthanonframes.
Aphysical-layer
Blink-layer
Cnetwork-layer
Dransport-layer
44.Aswitchisa()devicethatactsonframe.
Dtransport-layer
45.Inthefollowingfourdescriptions,whichoneisnotcorrect?
ASwitchescaninterconnectdifferentLANtechnologies.
BHubscaninterconnectdifferentLANtechnologies.
CThereisnolimittohowlargeaLANcanbewhenswitchesareusedtointerconnectLANsegments.
DThereisrestrictiononthemaximumallowablenumberofnodesinacollisiondomainwhenhubsareusedtointerconnectLANsegments.
46.Theabilitytodeterminewhetheraframeshouldbeforwardedtosomeinterfaceorshouldjustbedroppedis().
Afiltering
Bforwarding
Cself-learning
Doptimalrouting
47.Whichofthefollowingdevicesisnotaplugandplaydevice?
Ahub
Brouter
Cswitch
Drepeater
48.Whichofthefollowingdevicesisnotcut-throughdevice?
49.Inthefollowingfourdescriptions,whichoneisnotcorrect?
ASwitchesdonotofferanyprotectionagainstbroadcaststorms.
BRoutersprovidefirewallprotectionagainstlayer-2broadcaststorms.
CBothswitchesandroutersareplugandplaydevices.
DArouterisalayer-3packetswitch,aswitchisalayer-2packetswitch.
50.Whichdevicehasthesamecollisiondomain?
AHub
BSwitch
CRouter
DBridge
51.