20161223-chapter06 The Transport Layer f

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1、Chapter6:TheTransportLayerTheTransportLayerHeartofthewholeprotocolhierarchy.Providingreliable,cost-effectivedatatransportfromthesourcetothedestination.26.1TheTransportServiceServicesProvidedtotheUpperLayersTransportServicePrimitivesBerkeleySockets*AnExampleofSocketProgramming:AnInternetFile

2、Server*3TransportservicesandprotocolsTransportprotocols:ProvidelogicalcommunicationapplicationtransportbetweenapplicationprocessesnetworkrunningondifferenthostsdatalinknetworkphysicaldatalinkExecuteonendsystems(notthenetworkphysicalnetwork)datalinkphysicalTransportvs.networklayerservicesnetwor

3、kdatalinkNetworklayer:datatransferphysicalnetworkdatalinkbetweenendsystemsphysicali.e.,computer-to-computernetworkdatalinkTransportlayer:datatransferphysicalbetweenprocessesrunningonendsystemsapplicationtransporti.e.,process-to-processnetworkdatalinkrelieson&enhancesphysicalnetworklayerservic

4、es4TransportservicesandprotocolsFundamentaltransportlayerapplicationservicestransportnetworkdatalinknetworkMultiplexing/DemultiplexingphysicaldatalinknetworkphysicaldatalinkErrordetectionphysicalnetworkReliabledatadeliverydatalinkphysicalnetworkdatalinkFlowcontrolphysicalnetworkCongestioncon

5、troldatalinkphysicalServiceimplementationinInternettransportprotocolsapplicationtransportnetworkUDPdatalinkphysicalTCP5Transport-layerprotocolsInternettransportservices:applicationtransportreliable,in-orderunicastdeliverynetwork(TCP)datalinknetworkphysicaldatalinkcongestionnetworkphysicaldata

6、linkflowcontrolphysicalnetworkdatalinkconnectionsetupphysicalnetworkdatalinkunreliable(“best-effort”),unorderedphysicalunicastormulticastdelivery:UDPnetworkdatalinkservicesnotavailable:physicalreal-timeapplicationbandwidthguaranteestransportnetworkreliablemulticastdatalinkphysical66.1.1Serv

7、icesProvidedtotheUpperLayersThenetwork,transport,andapplicationlayers.76.1.2TransportServicePrimitivesTheprimitivesforasimpletransportservice.8TransportServicePrimitives(2)ThenestingofTPDUs,packets,andframes.9Tra