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1、Computerwking:ATopDownApproachFeaturingtheInter3rdEditionSolutionstoReviewQuestionsProblemsVersionDate:April262005Thisdocumentcontainsthesolutionstoreviewquestionsproblemsfthe3rdeditionofComputerwking:ATopDownApproachFea

2、turingtheInterbyJimKuroseKeithRoss.ThesesolutionsarebeingmadeavailabletoinstructsONLY.PleasedoNOTcopydistributethisdocumenttoothers(evenotherinstructs).PleasedonotpostanysolutionsonapubliclyavailableWebsite.We’llbehappyt

3、oprovideacopy(uptodate)ofthissolutionmanualourselvestoanyonewhoasks.Allmaterial?copyright19962005byJ.F.KuroseK.W.Ross.Allrightsreserved5.Flowcontrolcongestioncontrolaretwodistinctcontrolmechanismswithdistinctobjectives.F

4、lowcontrolmakessurethatneitherendofaconnectionoverwhelmsthebuffersintheotherendoftheconnectionbysendingtomanypacketstofast.Congestioncontrolregulatestheamountofdatathatanapplicationcansendintothewkhelpingtopreventcongest

5、ioninthewkce(i.e.inthebuffersinthewkrouters).6.TheInter’sconnectionientedserviceprovidesreliabledatatransferbyusingacknowledgementsretransmissions.Whenonesideoftheconnectiondoesn’treceiveanacknowledgement(fromtheothersid

6、eoftheconnection)fapacketittransmitteditretransmitsthepacket.7.Acircuitswitchedwkcanguaranteeacertainamountofendtoendbwidthfthedurationofacall.Mostpacketswitchedwkstoday(includingtheInter)cannotmakeanyendtoendguaranteesf

7、bwidth.8.Inapacketswitchedwkthepacketsfromdifferentsourcesflowingonalinkdonotfollowanyfixedpredefinedpattern.InTDMcircuitswitchingeachhostgetsthesameslotinarevolvingTDMframe.9.Attimet0thesendinghostbeginstotransmit.Attim

8、et1=LR1thesendinghostcompletestransmissiontheentirepacketisreceivedattherouter(nopropagationdelay).Becausetherouterhastheentirepacketattimet1itcanbegintotransmitthepackettothereceivinghostattimet1.Attimet2=t1LR2therouter

9、completestransmissiontheentirepacketisreceivedatthereceivinghost(againnopropagationdelay).ThustheendtoenddelayisLR1LR2.10.InaVCwkeachpacketswitchinthewkcemaintainsconnectionstateinfmationfeachVCpassingthroughit.Someofthi

10、sconnectionstateinfmationismaintainedtoaVCnumbertranslationtable.(Seepage25)11.TheconsofVCsinclude(i)theneedtohaveasignalingprotocoltosetupteardowntheVCs(ii)theneedtomaintainconnectionstateinthepacketswitches.Ftheprossom

11、eresearchersengineersarguethatitiseasiertoprovideQoSservicessuchasservicesthatguaranteeaminimumtransmissionrateservicesthatguaranteemaximumendtoendpacketdelay–whenVCsareused.12.1.Dialupmodemovertelephoneline:residential2

12、.DSLovertelephoneline:residentialsmalloffice3.CabletoHFC:residential4.100MbpsswitchedEtherent:company5.WirelessLAN:mobile6.Cellularmobileaccess(fexampleWAP):mobile13.Atier1ISPconnectstoallothertier1ISPsatier2ISPconnectst

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