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.docx
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天津理工大学计算机网络题库
PARTⅠ:
Choice
B 1.Whichofthefollowingservicesdoesnotthetransportlayerprovidefortheapplicationlayer?
A.In-orderdeliveryofdatasegmentsbetweenprocesses
B.Besteffortdeliveryofdatasegmentsbetweencommunicatinghosts
C.Multiplexinganddemultiplexingoftransportlayersegments
D.Congestioncontrol
A 2.WhatarethetwoofthemostimportantprotocolsintheInternet?
A.TCPandIP B.TCPandUDP C.TCPandSMTP D.ARPandDNS
C 3.TheInternetprovidestwoservicestoitsdistributedapplications:
aconnectionorientedreliableserviceanda( ).
A.connectionorientedunreliableservice
B.connectionlessreliableservice
C.connectionlessunreliableservice
D.Inorderdatatransportservice
D 4.Processesontwodifferentendsystemscommunicatewitheachotherbyexchanging( )acrossthecomputernetwork.
A.packets B.datagram C.frames D.messages
A 5.Thejobofdeliveringthedatainatransport-layersegmenttothecorrectsocketiscalled( ).
A.demultiplexing B.multiplexing C.TDM D.FDM
C 6.TwoimportantreasonsthattheInternetisorganizedasahierarchyofnetworksforthepurposesofroutingare:
A.Leastcostandmaximumfreecircuitavailability
B.Messagecomplexityandspeedofconvergence
C.Scaleandadministrativeautonomy
D.Linkcostchangesandlinkfailure
B 7.Whichofcharactersisnotdistance-vectoralgorithm’scharacters?
( )
A.iterative B.global C.asynchronous D.distributed
D 8.ThelengthofIPV6addressis( )bits.
A.32 B.48 C.64 D.128
C 9.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)
C 10.Theprimaryfunctionoftheaddressresolutionprotocol(ARP)thatresidesinInternethostsandroutersis:
A.ToprovideLANrouterfunctions
B.TotranslatebetweenLANaddressesandphysicalinterfaceaddresses
C.TotranslateIPaddressestoLANaddresses
D.TocalculatetheshortestpathbetweentwonodesonaLAN
A 11.ThePOP3 protocolrunsover____andusesport____.
A.TCP 110 B.UDP 110 C.UDP 25 D.TCP 25
D 12.Whenadestinationhosttransportlayerreceivesdatafromthenetworklayer,itunambiguouslyidentifiestheappropriateprocesstopassthedatatobyusingatripletconsistingof:
A.Sourceport#,destinationIPaddress,andsourceIPaddress
B.Destinationport#,sourceport#,processID#
C.Destinationport#,sourceport#,destinationIPaddress
D.Destinationport#,sourceport#,sourceIPaddress
D 13.Fromthelistbelow,selecttheitemsfoundintheTCPsegmentstructurethatarenotfoundintheUDPsegmentstructure:
A.ApplicationGeneratedData B.DestinationPort# C.SourcePort# D.Sequence#
A 14.TheRIProutingprotocolisbasedonanalgorithmthatis:
A.Basedoninformationreceivedonlyfromlink“neighbors”
B.Alinkstatealgorithm
C.AnOSPFalgorithm
D.Acentralizedroutingalgorithm
B 15.Withanexteriorroutingprotocol,whichofthefollowingissuesgenerallydominatestheroutingdecisions?
A.GeographicaldistancebetweenAS’s
B.Policy
C.NumberofAS’straversed
D.CurrentcongestionlevelsintheAS’s
A 1.Endsystemareconnectedtogetherby____.
A.communicationlinks B.applicationlayer C.transportlayer D.thenetworklayer
C 2.Whichapplication’sNOTusingTCP?
A.SMTP B.HTTP C.DNS D.Allofthem
B 3.Inthepollingprotocols,themasternodepollseachofthenodesina/an____fashion.
A.random B.appointed C.round-robin D.uncirculated
C 4.TheDNSprotocolrunsover____andusesport____.
A.UDP 36 B.TCP 36 C.UDP 53 D.TCP 53
A 5.TCPprovidesa____servicetoitsapplicationstoeliminatethepossibilityofthesenderover-flowingthereceiver’sbuffer.
A.flow-control B.congestioncontrol C.reliabilitycontrol D.dataconnection
D 6.Wecanclassifyjustaboutanymultipleaccessprotocolasbelongingtooneofthreecategories:
channelpartitioningprotocols,randomaccessprotocols,and____.
A.addressresolutionprotocols
B.Dynamichostconfigurationprotocols
C.link-controlprotocols
D.taking-turnsprotocols
B 8.Themaximumtransferunit(MTU)inEthernetframestructureis()byte.
A.1000 B.1500 C.800 D.2000
B 9.ThesocketofUDPisidentifiedby_____and_______.
A.sourceIPaddressandsourceportnumber
B.destinationIPaddressanddestinationportnumber.
C.sourceIPaddressanddestinationportnumber.
D.destinationIPaddressandsourceIPaddress.
C 10.Whichisnotplugandplayinthefollowingfouritems?
A.DHCP B.Hubs C.Routers D.Switches
D 11.Whichofroutersisnotdefaultrouters?
A.first-hoprouter B.sourcerouter C.destinationrouter D.second-hoprouter
B 13.ICMPis_____.
A.theprotocolofApplicationlayer
B.theprotocolofnetworklayer
C.theprotocoloftransportlayer
D.notapartofTCP/IPprotocols
B 14.Asgeneral,wehasfollowingchannelpartitioningprotocolsexcept____.
A.TDM B.CSMA C.FDM D.CDMA
D 15.____ismostusedforerrorreporting.
A.UDP B.SMTP C.FTP D.ICMP
B 16.TheheaderofIPV6is____byte.
A.20 B.40 C.60 D.80
B 17.Inthenetworklayertheseservicearehost-to-hostserviceprovidedby____.(B)
A.thetransportlayertothenetworklayer
B.thenetworklayertothetransportlayer
C.thenetworklayertothenetworklayer
D.thetransportlayertothetransportlayer
A 18.Ifthereisnotenoughmemorytobufferanincomingpacket,apolicythatdropthearrivingpacketcalled____.
A.drop-tail B.packetloss C.protocol D.encapsulation
C 19.Ineithercase,a____receivesroutingprotocolmessages,whichareusedtoconfigureitsforwardingtable.
A.server B.host C.router D.Modem
D 20.WhichofthefollowingfunctionsdoesnotbelongtoPPP___.
A.framing B.link-controlprotocols C.network-controlprotocols D.errorcorrection
B 1.WhichofthefollowingservicesdoestheInternetnetworklayerprovidefortheInternettransportlayer?
A.In-orderdeliveryofdatasegmentsbetweenprocesses
B.Besteffortdeliveryofdatasegmentsbetweencommunicatinghosts
C.Multiplexinganddemultiplexingoftransportlayersegments
D.Congestioncontrol
D 2.ThemaintaskoftheInternet’sDomainNameSystem(DNS)isto:
A.TranslateportnumberstoIPaddresses
B.SpecifythestandardsforInternetdomainnames
C.Provideanauthorityforregisteringdomainnames
D.Translatemnemonic(记忆的)namestoIPaddresses
A 10.TheFTPprotocolrunsover____andusesport____.
A.TCP 21 B.TCP 80 C.UDP 20 D.TCP 110
C 3.RDT3.0’sreceiverFSMissameto:
a) RDT1.0 b)RDT2.1 c)RDT2.2 d)RDT2.0
B 4.TheTransmissionControlProtocol(TCP)provideswhichofthefollowingservices?
a)End-to-endstationaddressing
b)Applicationmultiplexing
c)Internetworkrouting
d)Mediumaccesscontrol(MAC)
D 6.Giventhattherequestedinformationisnotavailableatanyintermediatedatabases,anon-iteratedDNSqueryfromarequestinghostwouldfollowthepath:
a)Rootnameserver,localnameserver,authoritativenameserver
b)Authoritativenameserver,rootnameserver,hostnameserver
c)Localnameserver,rootnameserver,localnameserver,authoritativenameserver
e)Localnameserver,rootnameserver,authoritativenameserver
A 8.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) 2,3,5,6 b)5,1,2,3 c)1,3,5,7 d) 2,3,4,6
B 10.Whencompensatingforlinkcostchangesinthedistancevectoralgorithm,itcangenerallybesaidthat:
a)Increasedcostsarepropagatedquickly,i.e.,“badnews”travelsfast
b)Decreasedcostsarepropagatedrapidly,i.e.,“goodnews”travelsfast
c)Decreasedcostsdonotconverge
d)Noneoftheabove
B 14.AsanIPdatagramtravelsfromitssourcetoitsdestination:
a)thesourceIPaddressischangedateachroutertoidentifythesendingrouter
b)therouterusesthedestinationIPaddresstoconsultitsroutingtable
c)therouterdoesnotusetheIPaddressesinthedatagram
d)thedestinationIPaddressischangedateachroutertoreflectthenexthop
C 15.Fromthelistbelow,choosethebitpatternwhichcouldbeavalidgeneratorvaluefortheCRCcode(R)11010:
a)1110
b)011010
c)100101
d)10011
A 16.Considersendinga1300byteIPv4datagramintoalinkthathasanMTUof500bytes:
a)Threefragmentsarecreated.
b)Fourfragmentsarecreated.
c)Threefragmentsarecreatedwithoffsets0,5001000
d)Thelastfragmentconsistsofexactly300bytesofdatafromt
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