天津理工大学 计算机网络题库.docx

天津理工大学 计算机网络题库.docx

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天津理工大学计算机网络题库

PARTⅠ:

Choice

B1.Whichofthefollowingservicesdoesnotthetransportlayerprovidefortheapplicationlayer?

A.In-orderdeliveryofdatasegmentsbetweenprocesses

B.Besteffortdeliveryofdatasegmentsbetweencommunicatinghosts

C.Multiplexinganddemultiplexingoftransportlayersegments

D.Congestioncontrol

A2.WhatarethetwoofthemostimportantprotocolsintheInternet?

A.TCPandIPB.TCPandUDPC.TCPandSMTPD.ARPandDNS

C3.TheInternetprovidestwoservicestoitsdistributedapplications:

aconnectionorientedreliableserviceanda（）.

A.connectionorientedunreliableservice

B.connectionlessreliableservice

C.connectionlessunreliableservice

D.Inorderdatatransportservice

D4.Processesontwodifferentendsystemscommunicatewitheachotherbyexchanging（）acrossthecomputernetwork.

A.packetsB.datagramC.framesD.messages

A5.Thejobofdeliveringthedatainatransport-layersegmenttothecorrectsocketiscalled（）.

A.demultiplexingB.multiplexingC.TDMD.FDM

C6.TwoimportantreasonsthattheInternetisorganizedasahierarchyofnetworksforthepurposesofroutingare:

A.Leastcostandmaximumfreecircuitavailability

B.Messagecomplexityandspeedofconvergence

C.Scaleandadministrativeautonomy

D.Linkcostchangesandlinkfailure

B7.Whichofcharactersisnotdistance-vectoralgorithm’scharacters？

（）

A.iterativeB.globalC.asynchronousD.distributed

D8.ThelengthofIPV6addressis（）bits.

A.32B.48C.64D.128

C9.ThehostcomponentofaCIDRaddressoftheforma.b.c.d/25cancontainaddressesfor:

A.225hosts（minus“special”hosts）

B.512hosts（minus“special”hosts）

C.2（32-25）hosts（minus“special”hosts）

D.25hosts（minus“special”hosts）

C10.Theprimaryfunctionoftheaddressresolutionprotocol（ARP）thatresidesinInternethostsandroutersis:

A.ToprovideLANrouterfunctions

B.TotranslatebetweenLANaddressesandphysicalinterfaceaddresses

C.TotranslateIPaddressestoLANaddresses

D.TocalculatetheshortestpathbetweentwonodesonaLAN

A11.ThePOP3protocolrunsover____andusesport____.

A.TCP110B.UDP110C.UDP25D.TCP25

D12.Whenadestinationhosttransportlayerreceivesdatafromthenetworklayer,itunambiguouslyidentifiestheappropriateprocesstopassthedatatobyusingatripletconsistingof:

A.Sourceport#,destinationIPaddress,andsourceIPaddress

B.Destinationport#,sourceport#,processID#

C.Destinationport#,sourceport#,destinationIPaddress

D.Destinationport#,sourceport#,sourceIPaddress

D13.Fromthelistbelow,selecttheitemsfoundintheTCPsegmentstructurethatarenotfoundintheUDPsegmentstructure:

A.ApplicationGeneratedDataB.DestinationPort#C.SourcePort#D.Sequence#

A14.TheRIProutingprotocolisbasedonanalgorithmthatis:

A.Basedoninformationreceivedonlyfromlink“neighbors”

B.Alinkstatealgorithm

C.AnOSPFalgorithm

D.Acentralizedroutingalgorithm

B15.Withanexteriorroutingprotocol,whichofthefollowingissuesgenerallydominatestheroutingdecisions?

A.GeographicaldistancebetweenAS’s

B.Policy

C.NumberofAS’straversed

D.CurrentcongestionlevelsintheAS’s

A1.Endsystemareconnectedtogetherby____.

A.communicationlinksB.applicationlayerC.transportlayerD.thenetworklayer

C2.Whichapplication’sNOTusingTCP?

A.SMTPB.HTTPC.DNSD.Allofthem

B3.Inthepollingprotocols,themasternodepollseachofthenodesina/an____fashion.

A.randomB.appointedC.round-robinD.uncirculated

C4.TheDNSprotocolrunsover____andusesport____.

A.UDP36B.TCP36C.UDP53D.TCP53

A5.TCPprovidesa____servicetoitsapplicationstoeliminatethepossibilityofthesenderover-flowingthereceiver’sbuffer.

A.flow-controlB.congestioncontrolC.reliabilitycontrolD.dataconnection

D6.Wecanclassifyjustaboutanymultipleaccessprotocolasbelongingtooneofthreecategories:

channelpartitioningprotocols,randomaccessprotocols,and____.

A.addressresolutionprotocols

B.Dynamichostconfigurationprotocols

C.link-controlprotocols

D.taking-turnsprotocols

B8.Themaximumtransferunit（MTU）inEthernetframestructureis（）byte.

A.1000B.1500C.800D.2000

B9.ThesocketofUDPisidentifiedby_____and_______.

A.sourceIPaddressandsourceportnumber

B.destinationIPaddressanddestinationportnumber.

C.sourceIPaddressanddestinationportnumber.

D.destinationIPaddressandsourceIPaddress.

C10.Whichisnotplugandplayinthefollowingfouritems?

A.DHCPB.HubsC.RoutersD.Switches

D11．Whichofroutersisnotdefaultrouters?

A.first-hoprouterB.sourcerouterC.destinationrouterD.second-hoprouter

B13.ICMPis_____.

A.theprotocolofApplicationlayer

B.theprotocolofnetworklayer

C.theprotocoloftransportlayer

D.notapartofTCP/IPprotocols

B14.Asgeneral,wehasfollowingchannelpartitioningprotocolsexcept____.

A.TDMB.CSMAC.FDMD.CDMA

D15.____ismostusedforerrorreporting.

A.UDPB.SMTPC.FTPD.ICMP

B16.TheheaderofIPV6is____byte.

A.20B.40C.60D.80

B17.Inthenetworklayertheseservicearehost-to-hostserviceprovidedby____.（B）

A.thetransportlayertothenetworklayer

B.thenetworklayertothetransportlayer

C.thenetworklayertothenetworklayer

D.thetransportlayertothetransportlayer

A18.Ifthereisnotenoughmemorytobufferanincomingpacket,apolicythatdropthearrivingpacketcalled____.

A.drop-tailB.packetlossC.protocolD.encapsulation

C19.Ineithercase,a____receivesroutingprotocolmessages,whichareusedtoconfigureitsforwardingtable.

A.serverB.hostC.routerD.Modem

D20.WhichofthefollowingfunctionsdoesnotbelongtoPPP___.

A.framingB.link-controlprotocolsC.network-controlprotocolsD.errorcorrection

B1.WhichofthefollowingservicesdoestheInternetnetworklayerprovidefortheInternettransportlayer?

A.In-orderdeliveryofdatasegmentsbetweenprocesses

B.Besteffortdeliveryofdatasegmentsbetweencommunicatinghosts

C.Multiplexinganddemultiplexingoftransportlayersegments

D.Congestioncontrol

D2.ThemaintaskoftheInternet’sDomainNameSystem（DNS）isto:

A.TranslateportnumberstoIPaddresses

B.SpecifythestandardsforInternetdomainnames

C.Provideanauthorityforregisteringdomainnames

D.Translatemnemonic（记忆的）namestoIPaddresses

A10.TheFTPprotocolrunsover____andusesport____.

A.TCP21B.TCP80C.UDP20D.TCP110

C3.RDT3.0’sreceiverFSMissameto:

a）RDT1.0b）RDT2.1c）RDT2.2d）RDT2.0

B4.TheTransmissionControlProtocol（TCP）provideswhichofthefollowingservices?

a）End-to-endstationaddressing

b）Applicationmultiplexing

c）Internetworkrouting

d）Mediumaccesscontrol（MAC）

D6.Giventhattherequestedinformationisnotavailableatanyintermediatedatabases,anon-iteratedDNSqueryfromarequestinghostwouldfollowthepath:

a）Rootnameserver,localnameserver,authoritativenameserver

b）Authoritativenameserver,rootnameserver,hostnameserver

c）Localnameserver,rootnameserver,localnameserver,authoritativenameserver

e）Localnameserver,rootnameserver,authoritativenameserver

A8.lectthefouressentialsteps,brieflydescribed,forterminatingaTCPconnectionbetweenaclientandaserver,assumingthattheinitiatinghostistheclient:

（1）ClientsendsTCPsegmentwithACK0andfinalsequencenumber

（2）ClientsendsTCPsegmentwithFIN=1andgoesintoFIN_WAITstate

（3）ServersendsTCPsegmenttoACKtheclient’sFINrequestandentersCLOSE_WAITstate

（4）ServersendsTCPsegmentwithFIN=0

（5）ServersendsTCPsegmentwithFIN=1

（6）ClientsendsTCPsegmentwithtoACKserver’sFINandenterssecondFIN_WAITstate

（7）ClientsendsTCPsegmentwithFIN=0

a）2，3，5，6b）5，1，2，3c）1，3，5，7d）2，3，4，6

B10.Whencompensatingforlinkcostchangesinthedistancevectoralgorithm,itcangenerallybesaidthat:

a）Increasedcostsarepropagatedquickly,i.e.,“badnews”travelsfast

b）Decreasedcostsarepropagatedrapidly,i.e.,“goodnews”travelsfast

c）Decreasedcostsdonotconverge

d）Noneoftheabove

B14.AsanIPdatagramtravelsfromitssourcetoitsdestination:

a）thesourceIPaddressischangedateachroutertoidentifythesendingrouter

b）therouterusesthedestinationIPaddresstoconsultitsroutingtable

c）therouterdoesnotusetheIPaddressesinthedatagram

d）thedestinationIPaddressischangedateachroutertoreflectthenexthop

C15.Fromthelistbelow,choosethebitpatternwhichcouldbeavalidgeneratorvaluefortheCRCcode（R）11010:

a）1110

b）011010

c）100101

d）10011

A16.Considersendinga1300byteIPv4datagramintoalinkthathasanMTUof500bytes:

a）Threefragmentsarecreated.

b）Fourfragmentsarecreated.

c）Threefragmentsarecreatedwithoffsets0,5001000

d）Thelastfragmentconsistsofexactly300bytesofdatafromtheoriginaldatagram

C17.SupposeoneIPv6routerwantstosendadatagramtoanotherIPv6router,butthetwoareconnectedtogetherviaaninterveningIPv4router.Ifthetworoutersusetunneling,then:

a）ThesendingIPv6routercreatesanIPv4datagramandputsitinthedatafieldofanIPv6datagram.

b）ThesendingIPv6routercreatesoneormoreIPv6fragments,noneofwhichislargerthanthemaximumsizeofanIPv4datagram.

c）ThesendingIPv6routercreatesanIPv6datagramandputsitinthedatafieldofanIPv4datagram.

d）ThesendingIPv6routercreatesanIPv6datagramandintervening