哈工大刘晓峰计算网络课件第三章

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1、Chapter3:TransportLayerOurgoals:understandprincipleslearnabouttransportbehindtransportlayerprotocolsinthelayerservices:Internet:multiplexing/demultiplUDP:connectionlessexingtransportreliabledatatransferTCP:connection-orientedtransportflowcontrolTCPcongestioncontrolcongestioncont

2、rol哈工大计算机学院李全龙ComputerNetworks3:TransportLayer1Chapter3outline3.1Transport-layer3.5Connection-orientedservicestransport:TCP3.2Multiplexingandsegmentstructuredemultiplexingreliabledatatransferflowcontrol3.3Connectionlessconnectionmanagementtransport:UDP3.6Principlesof3.4Principl

3、esofcongestioncontrolreliabledatatransfer3.7TCPcongestioncontrol哈工大计算机学院李全龙ComputerNetworks3:TransportLayer2Transportservicesandprotocolsprovidelogicalcommunicationapplicationtransportbetweenappprocessesnetworkdatalinknetworkrunningondifferenthostsphysicaldatalinknetworkphysicaltransp

4、ortprotocolsrunindatalinkphysicalendsystemsnetworkdatalinksendside:breaksappphysicalnetworkdatalinkmessagesintosegments,physicalpassestonetworklayernetworkdatalinkphysicalrcvside:reassemblessegmentsintomessages,applicationtransportpassestoapplayernetworkdatalinkphysicalmorethanonetran

5、sportprotocolavailabletoappsInternet:TCPandUDP哈工大计算机学院李全龙ComputerNetworks3:TransportLayer3Transportvs.networklayernetworklayer:logicalHouseholdanalogy:communication12kidssendingletterstobetweenhosts12kidstransportlayer:logicalprocesses=kidscommunicationappmessages=lettersbetweenproc

6、essesinenvelopesrelieson,enhances,hosts=housesnetworklayerservicestransportprotocol=AnnandBillnetwork-layerprotocol=postalservice哈工大计算机学院李全龙ComputerNetworks3:TransportLayer4Internettransport-layerprotocolsreliable,in-orderapplicationtransportdelivery(TCP)networkdatalinknetworkphysic

7、aldatalinkcongestioncontrolnetworkphysicaldatalinkflowcontrolphysicalnetworkdatalinkconnectionsetupphysicalnetworkdatalinkunreliable,unorderedphysicaldelivery:UDPnetworkdatalinkphysicalno-frillsextensionof“best-effort”IPapplicationtransportnetworkservicesnotavailabl