无线通信网络-第4章TCPIP协议族ppt课件.ppt

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1、ProtocolsandtheTCP/IPSuiteChapter4KeyFeaturesofaProtocolSyntaxConcernstheformatofthedatablocksSemanticsIncludescontrolinformationforcoordinationanderrorhandlingTimingIncludesspeedmatchingandsequencingAgentsInvolvedinCommunicationApplicationsExchangedatabetweencompute

2、rs(e.g.,electronicmail)ComputersConnectedtonetworksNetworksTransfersdatafromonecomputertoanotherTCP/IPLayersPhysicallayerNetworkaccesslayerInternetlayerHost-to-host,ortransportlayerApplicationlayerTCP/IPPhysicalLayerCoversthephysicalinterfacebetweenadatatransmissiond

3、eviceandatransmissionmediumornetworkPhysicallayerspecifies:CharacteristicsofthetransmissionmediumThenatureofthesignalsThedatarateOtherrelatedmattersTCP/IPNetworkAccessLayerConcernedwiththeexchangeofdatabetweenanendsystemandthenetworktowhichit'sattachedSoftwareusedde

4、pendsontypeofnetworkCircuitswitchingPacketswitching(e.g.,X.25)LANs(e.g.,Ethernet)OthersT:TCP/IPInternetLayerUsesinternetprotocol(IP)ProvidesroutingfunctionstoallowdatatotraversemultipleinterconnectednetworksImplementedinendsystemsandroutersTCP/IPHost-to-Host,orTransp

5、ortLayerCommonlyusestransmissioncontrolprotocol(tcp)ProvidesreliabilityduringdataexchangeCompletenessOrderTCP/IPApplicationLayerLogicsupportsuserapplicationsUsesseparatemodulesthatarepeculiartoeachdifferenttypeofapplicationProtocolDataUnits(PDUs)CommonTCP/IPApplicati

6、onsSimplemailtransferprotocol(SMTP)ProvidesabasicelectronicmailfacilityFileTransferProtocol(FTP)AllowsfilestobesentfromonesystemtoanotherTELNETProvidesaremotelogoncapabilityLayersoftheOSIModelApplicationPresentationSessionTransportNetworkDatalinkPhysicalOSIApplicatio

7、nLayerProvidesaccesstotheOSIenvironmentforusersProvidesdistributedinformationservicesOSIPresentationLayerProvidesindependencetotheapplicationprocessesfromdifferencesindatarepresentation(syntax)OSISessionLayerProvidesthecontrolstructureforcommunicationbetweenapplicati

8、onsEstablishes,manages,andterminatesconnections(sessions)betweencooperatingapplicationsOSITransportLayerProvidesreliable,transparen