思科网络技术学院教程(第二章 高层协议).ppt

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1、Copyright?1998,CiscoSystems,Inc.ICRC_revision_11.3高层协议第二章应用层与会话层Copyright?1998,CiscoSystems,Inc.ICRC_revision_11.3事务应用字处理图表电子表格数据库设计/制造课题计划其他应用层选择网络应用支持用户的事务应用网络应用电子邮件文件传输远程访问客户端/服务器模式处理信息定位网络管理其他?Graphics?VisualImagesPICTTIFFJPEGGIF表示层为应用层提供代码格式的转换?Text?DataASCIIEBCDICEncrypted

2、?Sound?VideoMIDIMPEGQuickTimelogin:网络文件系统(NFS)结构化查询语言(SQL)远程过程调用(RPC)X窗口系统互连网浏览器DNA会话控制协议(SCP)会话层ServiceRequestServiceReply支持在不同主机上对等应用程序之间的对话传输层Copyright?1998,CiscoSystems,Inc.ICRC_revision_11.3传输层概览将会话层数据分割成较小的分组建立端到端的连接将分组从一端主机发送到另一端主机保证数据可靠传输面向连接的会话同步同步确认连接协商数据传输(发送分组)SenderRece

3、iver连接建立流量控制BufferFullTransmitSenderReceiver流量控制BufferFullTransmitNotReadyStopSenderReceiver流量控制BufferFullProcessSegmentsBufferOKTransmitNotReadyStopSenderReceiver流量控制BufferFullProcessSegmentsBufferOKTransmitNotReadyStopReadyGoSenderReceiver流量控制BufferFullProcessSegmentsBufferOKTrans

4、mitNotReadyStopReadyGoResumeTransmissionSenderReceiver窗口技术Windowsize=1Send1Receive1SenderReceiver窗口技术Windowsize=1Send1Receive1Ack2SenderReceiver窗口技术Windowsize=1Send1Receive1Ack2Send2Receive2SenderReceiver窗口技术Windowsize=1Send1Receive1Ack2Send2Receive2Ack3SenderReceiver窗口技术Windowsize=1Se

5、nd1Receive1Ack2Send2Receive2Ack3Send1Send2Receive1Receive2Windowsize=3Send3Receive3SenderReceiverSenderReceiver窗口技术Windowsize=1Send1Receive1Ack2Send2Receive2Ack3Send1Send2Receive1Receive2Windowsize=3Send3Receive3Ack4SenderReceiverSenderReceiver窗口技术Windowsize=1Send1Receive1Ack2Send2Rece

6、ive2Ack3Send1Send2Receive1Receive2Windowsize=3Send3Receive3Ack4Send4SenderReceiverSenderReceiver正向确认SenderReceiver123456正向确认SenderReceiverSend2Send1Send3123456123正向确认SenderReceiverSend2Send1Send3Ack4Send4123456123正向确认SenderReceiverSend2Send1Send3Ack4Send5Send4Send612345612346正向确认Sender

7、ReceiverSend2Send1Send3Ack4Send5Send4Send6Ack512345612346正向确认SenderReceiverSend2Send1Send3Ack4Send5Send4Send6Ack5Send5123456123456正向确认SenderReceiverSend2Send1Send3Ack4Send5Send4Send6Ack5Send5Ack7123456123456正向确认SenderReceiverSend2Send1Send3Ack4Send5Send4Send6Ack5Send5Ack7123456123456