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1、ChapterI1.Whatisthedifferencebetweenahostandanendsystem?Listthetypesofendsystems.IsaWebserveranendsystem?2.Whatisaclientprogram?Whatisaserverprogram?Doesaserverprogramrequestandreceiveservicesfromaclientprogram?3.Listsixaccesstechnologies.Classifyeachoneasresidentialaccess,companyacce
2、ss,ormobileaccess.4.Dial-upmodems,HFC,andDSLareallusedforresidentialaccess.Foreachoftheseaccesstechnologies,providearangeoftransmissionratesandcommentonwhetherthetransmissionrateissharedordedicated.5.DescribethemostpopularwirelessInternetaccesstechnologiestoday.Compareandcontrastthem.
3、6.Whatadvantagedoesacircuit-switchednetworkhaveoverapacket-switchednetwork?WhatadvantagesdoesTDMhaveoverFDMinacircuit-switchednetwork?7.Considersendingapacketfromasourcehosttoadestinationhostoverafixedroute.Listthedelaycomponentsintheend-to-enddelay.Whichofthesedelaysareconstantandwhi
4、charevariable?8.Howlongdoesittakeapacketoflength2,000bytestopropagateoveralinkofdistance2,000km,propagationspeedm/s,andtransmissionrate2Mbps?Moregenerally,howlongdoesittakeapacketoflengthLtopropagateoveralinkofdistanced,propagationspeeds,andtransmissionrateRbps?Doesthisdelaydependonpa
5、cketlength?Doesthisdelaydependontransmissionrate?9.WhatarethefivelayersintheInternetprotocolstack?Whataretheprincipalresponsibilitiesofeachoftheselayers?10.WhichlayersintheInternetprotocolstackdoesarouterprocess?Whichlayersdoesalink-layerswitchprocess?Whichlayersdoesahostprocess?11.Wh
6、atisanapplication-layermessage?Atransport-layersegment?Anetwork-layerdatagram?Alink-layerframe?12.Thiselementaryproblembeginstoexplorepropagationdelayandtransmissiondelay,twocentralconceptsindatanetworking.Considertwohosts,AandB,connectedbyasinglelinkofrateRbps.Supposethatthetwohostsa
7、reseparatedbymmeters,andsupposethepropagationspeedalongthelinkissmeters/sec.HostAistosendapacketofsizeLbitstoHostB.a.Expressthepropagationdelay,,intermsofmands.b.Determinethetransmissiontimeofthepacket,,intermsofLandR.c.Ignoringprocessingandqueuingdelays,obtainanexpressionfortheend-to
8、-endd
