计算机专业英语 教学课件 作者 王凤岭 第五章.ppt

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1、NetworkTechnologyandWebDesignToolsUNITFIVELessonOneInternetProtocolsLessonTwoTransmissionControlProtocol(TCP)LessonThreeMacromediaDreamweaverMX2004BackgroundTheInternetprotocolsaretheworld'smostpopularopen-system(nonproprietary)protocolsuitebecausetheycanbeus

2、edtocommunicateacrossanysetofinterconnectednetworksandareequallywellsuitedforLANandWANcommunications.LessonOneInternetProtocolsprotocoln.草案，协议nonproprietary开放性的suite套，组across越过，横过interconnect使互相连接communication信息，通讯communicate沟通TheInternetprotocolsconsistofasu

3、iteofcommunicationprotocols,ofwhichthetwobestknownaretheTransmissionControlProtocol(TCP)andtheInternetProtocol(IP).TransmissionControlProtocol传输控制协议InternetProtocol网际协议InternetProtocol(IP)TheInternetProtocol(IP)isanetwork-layer(Layer3)protocolthatcontainsaddr

4、essinginformationandsomecontrolinformationthatenablespacketstoberouted.network-layeraddressroute网络层地址发送IPhastwoprimaryresponsibilities:providingconnectionless,best-effortdeliveryofdatagramsthroughaninternetwork;andprovidingfragmentationandreassemblyofdatagram

5、stosupportdatalinkswithdifferentmaximum-transmissionunit(MTU)sizes.responsibilityn.责任，职责connectionless无连接delivery传输，递送datagram数据包fragmentation分裂，破碎reassembly重新组装linkn.连结物,链接vt.连结；vi.连接起来maximumn.最大量,极大adj.最高的,最多的,最大极限的1.Youaregoingtomakeit.你准行！2.Youaregoingto

6、win.你会赢！3.Youaremyonlyhope.你是我的希望。4.Youarealmostthere.Keeptrying，sticktoit.你马上就要成功了，坚持，坚持下去！5.Youarethebest.你真是顶呱呱！[这是母亲对儿子、女孩对男友常说的话。]68.Youarefantastic.你太棒了！英语口语练习材料TheTCPprovidesreliabletransmissionofdatainanIPenvironment.TCPcorrespondstothetransportlayer(

7、Layer4)oftheOSIreferencemodel.AmongtheservicesTCPprovidesarestreamdatatransfer,reliability,efficientflowcontrol,full-duplexoperation,andmultiplexing.LessonTwoTransmissionControlProtocol(TCP)TCPoffersreliabilitybyprovidingconnection-oriented,end-to-endreliable

8、packetdeliverythroughaninternetwork.connection-oriented以连接为导向的end-to-end端到端的TCPConnectionEstablishmentConnectionestablishmentisperformedbyusinga"three-wayhandshake"mechanism.Athree-wayhan