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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’predictionsaboutwhatwillh
2、appennext.Butnotmanypeopleactuallyunderstandwhatitisandhowitworks.Takeawaythehype,andthebasicoperationoftheInternetisrathersimple.Here,inafewpages,isanoverviewofhowitworksinside,andwhyitworksthewayitdoes.Don’tforget—theInternetisnottheWorldWideWeb,ore-mail.TheInternetiswhatis“unde
3、rneath”them,andmakesthemallhappen.ThispaperdescribeswhattheInternetitselfis,andalsotellswhatactuallyhappens,forexample,whenyouclickonalinkinaWebpage.1.IntroductiontotheInternetTheInternetisacommunicationsfacilitydesignedtoconnectcomputerstogethersothattheycanexchangedigitalinforma
4、tion.Forthispurpose,theInternetprovidesabasiccommunicationservicethatconveysunitsofinformation,calledpackets,fromasourcecomputerattachedtotheInternettooneormoredestinationcomputersattachedtotheInternet.Additionally,theInternetprovidessupportingservicessuchasthenamingoftheattachedc
5、omputers.Anumberofhigh-levelservicesorapplicationshavebeendesignedandimplementedmakinguseofthisbasiccommunicationservice,includingtheWorldWideWeb,Internete-mail,theInternet"newsgroups",distributionofaudioandvideoinformation,andfiletransferand"login"betweendistantcomputers.Thedesig
6、noftheInternetissuchthatnewhigh-levelservicescanbedesignedanddeployedinthefuture.TheInternetdiffersinimportantwaysfromthenetworksinothercommunicationsindustriessuchastelephone,radioortelevision.Inthoseindustries,thecommunicationsinfrastructure--wires,fibers,transmissiontowersandso
7、on—hasbeenputinplacetoserveaspecificapplication.Itmayseemobviousthatthetelephonesystemwasdesignedtocarrytelephonecalls,buttheInternethadnosuchclearpurpose.TounderstandtheroleoftheInternet,considerthepersonalcomputer,orPC.ThePCwasnotdesignedforoneapplication,suchaswordprocessingors
8、preadsheets,butisinsteadageneral-
