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

《天津理工大学 计算机网络题库.docx》由会员分享，可在线阅读，更多相关《天津理工大学 计算机网络题库.docx（35页珍藏版）》请在冰豆网上搜索。

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