zyd_chap3_transport_tcp_2014

《zyd_chap3_transport_tcp_2014》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、A/Prof.ZhangNationalLaboratoryofCommunication,UESTCFeb.2014Unit3TransportProtocolsandServices0108440ComputerNetworksUnit3:TransportProtocolandServicesPage.1A/Prof.ZhangNationalLaboratoryofCommunication,UESTCFeb.2014TransportLayerGoals:Overview:•understandprinciplesbehind•transportlayerserv

2、icestransportlayerservices:•multiplexing/demultiplexing-multiplexing/demultiplexing•principlesofreliabledatatransfer-reliabledatatransfer•connection-orientedtransport:-flowcontrolTCP-congestioncontrol-connectionmanagement•itsimplementationintheInternet-flowcontrol-reliabletransfer•principl

3、esofcongestioncontrol•TCPcongestioncontrol•connectionlesstransport:UDP0108440ComputerNetworksUnit3:TransportProtocolandServicesPage.2A/Prof.ZhangNationalLaboratoryofCommunication,UESTCFeb.2014Transportservicesandprotocols•providelogicalcommunicationapplicationbetweenapp’processesrunningtra

4、nsportnetworkondifferenthostsdatalinknetworkphysicaldatalink•transportprotocolsruninendnetworkphysicaldatalinksystemsphysicalnetwork•transportvsnetworklayerdatalinkphysicalnetworkservices:datalinkphysical•networklayer:datatransfernetworkbetweenendsystemsdatalinkphysical•transportlayer:data

5、transferbetweenprocessesapplicationtransport-relieson,enhances,networknetworkdatalinklayerservicesphysical0108440ComputerNetworksUnit3:TransportProtocolandServicesPage.3A/Prof.ZhangNationalLaboratoryofCommunication,UESTCFeb.2014Transportservicesandprotocols•Networklayerhasasinglenetworkadd

6、ress•Transportlayermayhavemultipletransportaddresses-useinmultiplexing/demultiplexing(复接/解复接)0108440ComputerNetworksUnit3:TransportProtocolandServicesPage.4A/Prof.ZhangNationalLaboratoryofCommunication,UESTCFeb.2014Transportservicesandprotocols•Addressing:-Networklayerhasasinglenetworkaddr

7、essIPaddress-Transportlayermayhavemultipletransportaddresses-useinmultiplexing/demultiplexingIPaddress+portnumber-Portnumberassignments(RFC1700)byIANA:well-knownport:0through1023,reservedfor`well-known`servicesliketelnetandftpmaximumnumberofports65535more