网络试卷(word版)

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1、计算机网络08级试题NOTE:ThisisaCLOSEDBOOK,120-minuteexam.Notextbooks,notesordictionariesareallowed.Itconsistsoffoursectionswithatotalof100marks.YouareencouragedtoWRITEYOURANSWERSINENGLISH.Ifyoudo,youwillget1-5marksadditionally.Thankyou,andGoodluck!SectionOne:MultipleChoice(10Marks):Pleasechoosethebestan

2、swerforeachofthefollowingtenquestions.C1.Theslidingwindowprotocolisusedatthe(A)physicallayeranddatalinklayer(B)datalinklayerandnetworklayer(C)datalinklayerandtransportlayer(D)transportlayerandapplicationlayerD2.TheTransmissionControlProtocol(TCP)is(A)aconnectionlessnetworklayerprotocol(B)aconne

3、ction-orientednetworklayerprotocol(C)aconnectionlesstransportlayerprotocol(D)aconnection-oriented(面向连接的)transportlayerprotocolB3.Packet-switchednetworksmovedatainseparate,smallblocks,i.e.packets,(A)basedonthedestinationMACaddressineachframe.(B)basedonthedestinationIPaddressineachpacket.(C)based

4、onthepacketsize.(D)alongadedicatedpoint-to-pointconnectionssetupduringthecall.D4.WhichoneoffollowingnetworkingdeviceshastwoormoredifferentIPaddresseswithdifferentnet-id?(A)Repeater(B)Hub(C)Bridge(D)RouterA5.”00:e0:f9:23:a8:20”is(A)aMACaddress(B)anIPaddress(C)aPortnumber(D)noneofaboveD6.Whichlay

5、erprovidescommunicationbetweentwoprocessesrunningontwodifferenthosts.(A)Physicallayer(B)Datalinklayer(C)Networklayer(D)TransportlayerC7.TheEthernetstandarddefinesaminimumframessizeas64bytesbecause(A)usersneversendsmalldatafiles.(B)Ethernetcannotdefineasmallsendingwindow.(C)theCSMA/CDischaracter

6、izedby“non-deterministicwhensending”.(D)noneoftheabove.B8.OnanEthernet,ahostalwayslistenstothechannelwhileitistransmittingdata.Assoonasdetectingacollision,itabortstransmission,waitsforawhile,andthenretransmitthesameframe.Theamountofwaitingtimeis(A)aconstant.i.e.onesecond.(B)determinedbythebinar

7、yexponentialback-offalgorithm.(C)determinedbythereceivinghost.(D)determinedbythenetworkadministrator.A9.Whichkindofdelayinapacket-switchednetworkdependsoncongestionlevelofrouter?(A)Queuingdelay（排队时延）(B)Transmissiondelay（发送时延）(C)Pr