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1、ComputerNetworking:ATop-DownApproachrdFeaturingtheInternet,3EditionSolutionstoReviewQuestionsandProblemsVersionDate:April26,2005Thisdocumentcontainsthesolutionstoreviewquestionsandproblemsforthe3rdeditionofComputerNetworking:ATop-DownApproachFeaturingtheInternetbyJimKuroseandKeithRoss.T
2、hesesolutionsarebeingmadeavailabletoinstructorsONLY.PleasedoNOTcopyordistributethisdocumenttoothers(evenotherinstructors).Pleasedonotpostanysolutionsonapublicly-availableWebsite.We’llbehappytoprovideacopy(up-to-date)ofthissolutionmanualourselvestoanyonewhoasks.Allmaterial©copyright1996-
3、2005byJ.F.KuroseandK.W.Ross.AllrightsreservedChapter1ReviewQuestions1.Thereisnodifference.Throughoutthistext,thewords“host”and“endsystem”areusedinterchangeably.EndsystemsincludePCs,workstations,Webservers,mailservers,Internet-connectedPDAs,WebTVs,etc.2.SupposeAlice,anambassadorofcountry
4、AwantstoinviteBob,anambassadorofcountryB,overfordinner.Alicedoesn’tsimplyjustcallBobonthephoneandsay,“cometoourdinnertablenow”.Instead,shecallsBobandsuggestsadateandtime.Bobmayrespondbysayinghe’snotavailablethatparticulardate,butheisavailableanotherdate.AliceandBobcontinuetosend“message
5、s”backandforthuntiltheyagreeonadateandtime.Bobthenshowsupattheembassyontheagreeddate,hopefullynotmorethan15minutesbeforeoraftertheagreedtime.DiplomaticprotocolsalsoallowforeitherAliceorBobtopolitelycanceltheengagementiftheyhavereasonableexcuses.3.Anetworkingprogramusuallyhastwoprograms,
6、eachrunningonadifferenthost,communicatingwitheachother.Theprogramthatinitiatesthecommunicationistheclient.Typically,theclientprogramrequestsandreceivesservicesfromtheserverprogram.4.TheInternetprovidesitsapplicationsaconnection-orientedservice(TCP)andaconnectionlessservice(UDP).EachInte
7、rnetapplicationmakesuseofonethesetwoservices.ThetwoserviceswillbediscussedindetailinChapter3.Someoftheprinciplecharacteristicsoftheconnection-orientedserviceare:•Twoend-systemsfirst“handshake”beforeeitherstartstosendapplicationdatatotheother.•Providesreliabledatatransfer,i.e.,a
