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1、毕业论文（设计）外文翻译外文原文AnInsider’sGuidetotheInternetDavidD.ClarkM.I.T.ComputerScienceandArtificialIntelligenceLaboratoryVersion2.07/25/04AlmosteveryonehasheardoftheInternet.Wecruisetheweb,wewatchthevaluationofInternetcompaniesonthestockmarket,andwereadthepundits’predictionsabou
2、twhatwillhappennext.Butnotmanypeopleactuallyunderstandwhatitisandhowitworks.Takeawaythehype,andthebasicoperationoftheInternetisrathersimple.Here,inafewpages,isanoverviewofhowitworksinside,andwhyitworksthewayitdoes.Don’tforget—theInternetisnottheWorldWideWeb,ore-mail.TheI
3、nternetiswhatis“underneath”them,andmakesthemallhappen.ThispaperdescribeswhattheInternetitselfis,andalsotellswhatactuallyhappens,forexample,whenyouclickonalinkinaWebpage.1.IntroductiontotheInternetTheInternetisacommunicationsfacilitydesignedtoconnectcomputerstogethersotha
4、ttheycanexchangedigitalinformation.Forthispurpose,theInternetprovidesabasiccommunicationservicethatconveysunitsofinformation,calledpackets,fromasourcecomputerattachedtotheInternettooneormoredestinationcomputersattachedtotheInternet.Additionally,theInternetprovidessupport
5、ingservicessuchasthenamingoftheattachedcomputers.Anumberofhigh-levelservicesorapplicationshavebeendesignedandimplementedmakinguseofthisbasiccommunicationservice,includingtheWorldWideWeb,Internete-mail,theInternet"newsgroups",distributionofaudioandvideoinformation,andfile
6、transferand"login"betweendistantcomputers.ThedesignoftheInternetissuchthatnewhigh-levelservicescanbedesignedanddeployedinthefuture.TheInternetdiffersinimportantwaysfromthenetworksinothercommunicationsindustriessuchastelephone,radioortelevision.Inthoseindustries,thecommun
7、icationsinfrastructure--wires,fibers,transmissiontowersandsoon—hasbeenputinplacetoserveaspecificapplication.Itmayseemobviousthatthetelephonesystemwasdesignedtocarrytelephonecalls,buttheInternethadnosuchclearpurpose.TounderstandtheroleoftheInternet,considerthepersonalcomp
8、uter,orPC.ThePCwasnotdesignedforoneapplication,suchaswordprocessingorspreadsheets,butisinsteadageneral-
