天津理工大学 计算机网络题库Word文档格式.docx
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天津理工大学 计算机网络题库Word文档格式.docx
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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?
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
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