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1、ComputerNetworking:ATop-DownApproachFeaturingtheInternet,4thEditionSolutionstoReviewQuestionsandProblemsVersionDate:October29,2007Thisdocumentcontainsthesolutionstoreviewquestionsandproblemsforthe4theditionofComputerNetworking:ATop-DownApproachFeaturingtheInte
2、rnetbyJimKuroseandKeithRoss.ThesesolutionsarebeingmadeavailabletoinstructorsONLY.PleasedoNOTcopyordistributethisdocumenttoothers(evenotherinstructors).Pleasedonotpostanysolutionsonapublicly-availableWebsite.We’llbehappytoprovideacopy(up-to-date)ofthissolutionm
3、anualourselvestoanyonewhoasks.Allmaterial©copyright1996-2007byJ.F.KuroseandK.W.Ross.AllrightsreservedChapter1ReviewQuestions1.Thereisnodifference.Throughoutthistext,thewords“host”and“endsystem”areusedinterchangeably.EndsystemsincludePCs,workstations,Webservers
4、,mailservers,Internet-connectedPDAs,WebTVs,etc.2.SupposeAlice,anambassadorofcountryAwantstoinviteBob,anambassadorofcountryB,overfordinner.Alicedoesn’tsimplyjustcallBobonthephoneandsay,“cometoourdinnertablenow”.Instead,shecallsBobandsuggestsadateandtime.Bobmayr
5、espondbysayinghe’snotavailablethatparticulardate,butheisavailableanotherdate.AliceandBobcontinuetosend“messages”backandforthuntiltheyagreeonadateandtime.Bobthenshowsupattheembassyontheagreeddate,hopefullynotmorethan15minutesbeforeoraftertheagreedtime.Diplomati
6、cprotocolsalsoallowforeitherAliceorBobtopolitelycanceltheengagementiftheyhavereasonableexcuses.3.Anetworkingprogramusuallyhastwoprograms,eachrunningonadifferenthost,communicatingwitheachother.Theprogramthatinitiatesthecommunicationistheclient.Typically,theclie
7、ntprogramrequestsandreceivesservicesfromtheserverprogram.4.1.Dial-upmodemovertelephoneline:residential;2.DSLovertelephoneline:residentialorsmalloffice;3.CabletoHFC:residential;4.100MbpsswitchedEtherent:company;5.WirelessLAN:mobile;6.Cellularmobileaccess(forexa
8、mple,WAP):mobile5.HFCbandwidthissharedamongtheusers.Onthedownstreamchannel,allpacketsemanatefromasinglesource,namely,theheadend.Thus,therearenocollisionsinthedownstreamchannel.6.Cu
