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1、PartI:IntroductionChaptergoal:getcontext,overview,“feel”ofnetworkingmoredepth,detaillaterincourseapproach:descriptiveuseInternetasexampleOverview:what’stheInternetwhat’saprotocol?networkedgenetworkcoreaccessnet,physicalmediaperformance:loss,delayprotocollayers,servicemodelsbackbones
2、,NAPs,ISPshistoryATMnetwork11:IntroductionWhat’stheInternet:“nutsandbolts”viewmillionsofconnectedcomputingdevices:hosts,end-systemspc’sworkstations,serversPDA’sphones,toastersrunningnetworkappscommunicationlinksfiber,copper,radio,satelliterouters:forwardpackets(chunks)ofdatathrunetw
3、orklocalISPcompanynetworkregionalISProuterworkstationservermobile21:IntroductionWhat’stheInternet:“nutsandbolts”viewprotocols:controlsending,receivingofmsgse.g.,TCP,IP,HTTP,FTP,PPPInternet:“networkofnetworks”looselyhierarchicalpublicInternetversusprivateintranetInternetstandardsRFC:
4、RequestforcommentsIETF:InternetEngineeringTaskForcelocalISPcompanynetworkregionalISProuterworkstationservermobile31:IntroductionWhat’stheInternet:aserviceviewcommunicationinfrastructureenablesdistributedapplications:WWW,email,games,e-commerce,database.,voting,more?communicationservi
5、cesprovided:connectionlessconnection-orientedcyberspace[Gibson]:“aconsensualhallucinationexperienceddailybybillionsofoperators,ineverynation,...."41:IntroductionWhat’saprotocol?humanprotocols:“what’sthetime?”“Ihaveaquestion”introductions…specificmsgssent…specificactionstakenwhenmsgs
6、received,orothereventsnetworkprotocols:machinesratherthanhumansallcommunicationactivityinInternetgovernedbyprotocolsprotocolsdefineformat,orderofmsgssentandreceivedamongnetworkentities,andactionstakenonmsgtransmission,receipt51:IntroductionWhat’saprotocol?ahumanprotocolandacomputern
7、etworkprotocol:Q:Otherhumanprotocol?HiHiGotthetime?2:00TCPconnectionreq.TCPconnectionreply.Gethttp://gaia.cs.umass.edu/index.htmtime61:IntroductionAcloserlookatnetworkstructure:networkedge:applicationsandhostsnetworkcore:routersnetworkofnetworksaccessnetworks,physicalmedia:com
8、municationlinks71:I
