计算机网络英文题库附答案chapter5.docx

计算机网络英文题库附答案chapter5.docx

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计算机网络英文题库附答案chapter5

Chapter5TheLinkLayerandLocalAreaNetwork

1．A（）protocolisusedtomoveadatagramoveranindividuallink.

Aapplication-layer

Btransport-layer

Cnetwork-layer

Dlink-layer

2．Theunitsofdataexchangedbyalink-layerprotocolarecalled（）.

Adatagrams

Bframes

Csegments

Dmessages

3．Whichofthefollowingprotocolsisnotalink-layerprotocol?

（）

AEthernet

BPPP

CHDLC

DIP

4．Inthefollowingfourdescriptions,whichoneisnotcorrect?

（）

Alink-layerprotocolhasthenode-to-nodejobofmovingnetwork-layerdatagramsoverasinglelinkinthepath.

BTheservicesprovidedbythelink-layerprotocolsmaybedifferent.

CAdatagrammustbehandledbythesamelink-layerprotocolsonthedifferentlinksinthepath.

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

Doptimalrouting

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

DDNS

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

BARP

CDHCP

DIP

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.

Aphysical-layer

Blink-layer

Cnetwork-layer

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?

（）

Ahub

Brouter

Cswitch

Drepeater

49．Inthefollowingfourdescriptions,whichoneisnotcorrect?

（）

ASwitchesdonotofferanyprotectionagainstbroadcaststorms.

BRoutersprovidefirewallprotectionagainstlayer-2broadcaststorms.

CBothswitchesandroutersareplugandplaydevices.

DArouterisalayer-3packetswitch,aswitchisalayer-2packetswitch.

50．Whichdevicehasthesamecollisiondomain?

（）

AHub

BS