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1、Chapter1ComputerNetworksandtheInternetIntroduction1-1ßLecturer:YunLiuß13888918579ßliuyunkm@126.comßyunliu.ys168.comIntroduction1-2MarksHomeWorks:10%Projects:20%Exam:70%Introduction1-3中文参考书英文原版教程计算机网络:用自顶向下方法计算机网络——自顶向下方法与描述因特网特色:第2版Internet特色（第三版影印版）作者:[美]JamesF.Kuro
2、se作者:JamesF.KuroseKeithW.Ross出版社:高等教育出版社出版社:人民邮电出版社出版日期:2005-01-01出版日期:2004-01-01ISBN:704012231ISBN:711511942Introduction1-4Chapter1:IntroductionOurgoal:Overview:ßgetcontext,ßwhat’stheInternetoverview,“feel”ofßwhat’saprotocol?networkingßnetworkedgeßmoredepth,detailßn
3、etworkcorelaterincourseßaccessnet,physicalmediaßapproach:ßInternet/ISPstructureüdescriptiveßperformance:loss,delayüuseInternetasßprotocollayers,servicemodelsexampleßhistoryIntroduction1-5Chapter1:roadmap1.1WhatistheInternet?1.2Networkedge1.3Networkcore1.4Networkacces
4、sandphysicalmedia1.5InternetstructureandISPs1.6Delay&lossinpacket-switchednetworks1.7Protocollayers,servicemodels1.8HistoryIntroduction1-6What’stheInternet:“nutsandbolts”viewßmillionsofconnectedrouterworkstationcomputingdevices:hosts,serverend-systemsmobileüPCsworkst
5、ations,serverslocalISPüPDAsphones,toastersrunningnetworkappsßcommunicationlinksregionalISPüfiber,copper,radio,satelliteütransmissionrate=bandwidthßrouters:forwardpacketscompany(chunksofdata)networkIntroduction1-7“Cool”internetappliancesIPpictureframehttp://www.ceiva.
6、com/Web-enabledtoaster+weatherforecasterWorld’ssmallestwebserverhttp://www-ccs.cs.umass.edu/~shri/iPic.htmlIntroduction1-8What’stheInternet:“nutsandbolts”viewßprotocolscontrolsending,routerworkstationreceivingofmsgsserverüe.g.,TCP,IP,HTTP,FTP,PPPmobilelocalISPßIntern
7、et:“networkofnetworks”ülooselyhierarchicalüpublicInternetversusregionalISPprivateintranetßInternetstandardsüRFC:RequestforcommentsüIETF:InternetEngineeringTaskForcecompanynetworkIntroduction1-9What’stheInternet:aserviceviewßcommunicationinfrastructureenablesdistribut
8、edapplications:üWeb,email,games,e-commerce,database.,voting,file(MP3)sharingßcommunicationservicesprovidedtoapps:üconnectionlessüco
