计算机网络 Circuit Switching and Packet Switching

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1、CircuitSwitchingandPacketSwitchingENTC345Dr.AnaGoulartAssistantProfessorAnnouncementsReading:StallingsChapter1and2Chapter10TA:Aninda@neo.tamu.eduOfficehours:Mondays5to8pm(T101)Hw#1duetodayReviewM/M/1example–incominglinkinformationHw#1:ExamplesofsimulationsandapplicationsHowwasth

2、efirstlab?OnOpnet–TrafficApplicationsandProfilesApplicationModels:generatetypicalapplicationtrafficpatternsExamples:FTPEmailRemoteLoginVideoConferencingDatabaseHTTPPrintVoiceCustomStandardapplicationsOnOpnetStandardapplicationsClient/ServerModelTwo-tierarchitectureClientServerre

3、questresponse*Sessions:singleconversationbetweenclient/server*TrafficorganizedintosessionsApplicationsandProfilesApplications:simpletrafficsources,orcomplexprotocols,ordiscretesetoftasksApplicationProfile:user’sbehaviorSpecifyapplicationhe/sheuseshowlongandhowoftenApplicationsan

4、dProfilesApplicationProfile:user’sbehaviorExample:starttime,duration,repeatability,parallelapplicationsorserialapplicationsEmailHTTPFTPEmailHTTPFTPProfile1:SerialProfile2:ParallelEmailApplicationModelHierarchyProfileApplicationTasksPhaseProfileObjectApplicationObjectTaskObject(C

5、ustomapplications)Lab1–SmallInternetworkApplicationandProfileObjects–databaseSteps:Createapplication–addrow1Createprofile–setattributesWorkstationobject-AssignprofiletodesiredworkstationsServerobject–assignservicetype(application)Example:Howwouldyoumodelthetrafficatthelibrary’ss

6、ubnet?ANetworkConfigurationRRRRREthernetswitchATMswitchFirewallhostPrivateWANServerISPLANPCsSubscriberconnectionInternetResidentialuser(page30-Stallings)WideAreaNetworkImportantconcepts:CircuitswitchingPacketswitchingFramerelayATM(AsynchronousTransferMode)WideAreaNetworksImporta

7、ntconcepts:Circuitswitching–-fixedroutes,dedicatedpathbetween2stations-oneachlink,alogicalchannelisdedicatedtotheconnection-datatransmittedalongthededicatedpathasrapidlyaspossiblePacketswitching–-datasentinasequenceofpackets-eachpacketpassedfromnodetonodealongsomepath-ateachnode

8、,theentirepacketisreceived,storedbrieflyandtran