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1、Chapter1IntroductionOriginallymadebyJ.FKuroseandK.W.RossModifiedbyMingyuLimCollaborativeComputingSystemsLab(http://ccslab.konkuk.ac.kr)DepartmentofInternetandMultimediaEngineeringKonkukUniversityIntroduction1-1Chapter1:IntroductionOurgoal:Overview:get“feel”andwhat’stheInter
2、net?terminologywhat’saprotocol?moredepth,detailnetworkedge;hosts,accesslaterincoursenet,physicalmediaapproach:networkcore:packet/circuituseInternetasexampleswitching,Internetstructureperformance:loss,delay,throughputsecurityprotocollayers,servicemodelshistoryIntrodu
3、ction1-2Chapter1:roadmap1.1WhatistheInternet?1.2Networkedgeendsystems,accessnetworks,links1.3Networkcorecircuitswitching,packetswitching,networkstructure1.4Delay,lossandthroughputinpacket-switchednetworks1.5Protocollayers,servicemodels1.6Networksunderattack:security1.7Histo
4、ryIntroduction1-3What’stheInternet:“nutsandbolts”viewPCmillionsofconnectedMobilenetworkservercomputingdevices:GlobalISPhosts=endsystemswirelesslaptoprunningnetworkcellularhandheldHomenetworkappsRegionalISPcommunicationlinksaccessfiber,copper,pointsradio,satelliteInstituti
5、onalnetworkwiredlinkstransmissionrate=bandwidthrouters:forwardrouterpackets(chunksofdata)Introduction1-4“Cool”internetappliancesWeb-enabledtoaster+weatherforecasterIPpictureframehttp://www.ceiva.com/World’ssmallestwebserverhttp://www-ccs.cs.umass.edu/~shri/iPic.htmlInternet
6、phonesIntroduction1-5What’stheInternet:“nutsandbolts”viewMobilenetworkprotocolscontrolsending,receivingofmsgsGlobalISPe.g.,TCP,IP,HTTP,Skype,EthernetHomenetworkInternet:“networkofnetworks”RegionalISPlooselyhierarchicalpublicInternetversusInstitutionalnetworkprivateintran
7、etInternetstandardsRFC:RequestforcommentsIETF:InternetEngineeringTaskForceIntroduction1-6What’stheInternet:aserviceviewcommunicationinfrastructureenablesdistributedapplications:Web,VoIP,email,games,e-commerce,filesharingcommunicationservicesprovidedtoapps:reliabledatad
8、eliveryfromsourcetodestination“besteffort”(unreliable)datadeliveryI
