CCNA思科网络技术学院教程-第9章_TCP-IP传输层与应用层.ppt

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1、第9章TCP/IP传输层与应用层主要内容讨论传输层如何利用网络层提供的服务来提供源和目的地之间的端到端连接。9.1理解TCP/IP传输层TransmissionControlProtocol(TCP)UserDatagramProtocol(UDP)ApplicationTransportInternetNetworkinterfaceConnection-OrientedConnectionless1、TCP数据段格式Sourceport(16)Destinationport(16)Sequencenumber(32)Headerlength(

2、4)Acknowledgementnumber(32)Reserved(6)Codebits(6)Window(16)Checksum(16)Urgent(16)Options(0or32ifany)Data(varies)20BytesBit0Bit15Bit16Bit31Nosequenceoracknowledgmentfields2、UDPSegmentFormatSourceport(16)Destinationport(16)Length(16)Data(ifany)1Bit0Bit15Bit16Bit31Checksum(16)8By

3、tes3、PortNumbersTCPPortNumbersFTPTransportLayerTELNETDNSSNMPTFTPSMTPUDPApplicationLayer2123255369161RIP520理解TCP端口号SourcePortDest.Port…HostA102823…SPDPHostZTelnetZDest.port=23.SendpackettomyTelnetapplication.Determinesdestinationupper-layerprotocol4、Proto

4、colFieldTransportLayerInternetLayerTCPUDPProtocolNumbersIP176SendSYN(seq=100ctl=SYN)SYNreceivedHostAHostB5、TCPThreeWayHandshake/OpenConnection1SendSYN(seq=100ctl=SYN)SYNreceivedSendSYN,ACK(seq=300ack=101ctl=syn,ack)HostAHostBSYNreceived12TCPThreeWayHandshake/OpenConnectionSen

5、dSYN(seq=100ctl=SYN)SYNreceivedSendSYN,ACK(seq=300ack=101ctl=syn,ack)Established(seq=101ack=301ctl=ack)HostAHostB123SYNreceivedTCPThreeWayHandshake/OpenConnectionTCPSimpleAcknowledgmentWindowsize=1SenderReceiverTCPSimpleAcknowledgmentWindowsize=1SenderReceiverSend1Receive1TCPSim

6、pleAcknowledgmentWindowsize=1SenderReceiverSend1Receive1ReceiveACK2SendACK2TCPSimpleAcknowledgmentWindowsize=1SenderReceiverSend1Receive1ReceiveACK2SendACK2Send2Receive2TCPSimpleAcknowledgmentWindowsize=1SenderReceiverSend1Receive1ReceiveACK2SendACK2Send2Receive2ReceiveACK3SendA

7、CK3TCPSimpleAcknowledgmentWindowsize=1SenderReceiverSend1Receive1ReceiveACK2SendACK2Send2Receive2ReceiveACK3SendACK3Send3Receive3Windowsize=1SenderReceiverSend1Receive1ReceiveACK2SendACK2Send2Receive2ReceiveACK3SendACK3Send3Receive3ReceiveACK4SendACK4TCPSimpleAcknowledgmentTCPSe

8、quenceandAcknowledgmentNumbersSourcePortDest.P