思科网络技术培训之8：TCP-IP协议.ppt

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1、Chapter8InterconnectingNetworkswithTCP/IPUponcompletionofthischapteryouwillbeabletoperformthefollowingtasks:IdentifytheIPprotocolstack,itsprotocollayerfunctions,andcommonlyusedIPprotocolsIdentifyIPaddressclasses,IPaddresses,IPsubnetmasks,IPnetworknumbers,subnetnumbers,andpossiblehostnumbers.Co

2、nfigureIPaddressesandsubnetmasksonarouterinterfaceandoptionallyconfigureahosttable.InterconnecttheVLANswithalayerthreedevicesuchasarouteronastick.ObjectivesEarlyprotocolsuiteUniversalIntroductiontoTCP/IPHostInternetTCP/IPHostTCP/IPProtocolStackApplicationPresentationSessionTransportNetworkData

3、LinkPhysicalApplicationTransportInternetDataLinkPhysicalIOSTCP/IPApplicationLayerOverview*UsedbytherouterApplicationTransportInternetDataLinkPhysicalFileTransfer-TFTP*-FTP*-NFSE-Mail-SMTPRemoteLogin-Telnet*-rlogin*NetworkManagement-SNMP*NameManagement-DNS*TransportLayerOverviewTransmissionCont

4、rolProtocol(TCP)UserDatagramProtocol(UDP)ApplicationTransportInternetDataLinkPhysicalConnection-OrientedConnectionlessTCPSegmentFormatSourceport(16)Destinationport(16)Sequencenumber(32)Headerlength(4)Acknowledgementnumber(32)Reserved(6)Codebits(6)Window(16)Checksum(16)Urgent(16)Options(0or3

5、2ifany)Data(varies)20BytesBit0Bit15Bit16Bit31PortNumbersTCPPortNumbersFTPTransportLayerTELNETDNSSNMPTFTPSMTPUDPApplicationLayer2123255369161RIP520TCPPortNumbersSourcePortDest.Port…HostA102823…SPDPHostZTelnetZDest.port=23.SendpackettomyTelnetapplication.SendSYN(seq=100c

6、tl=SYN)SYNreceivedSendSYN,ACK(seq=300ack=101ctl=syn,ack)Established(seq=101ack=301ctl=ack)HostAHostB123SYNreceivedTCPThreeWayHandshake/OpenConnectionTCPSimpleAcknowledgmentWindowsize=1SenderReceiverSend1Receive1ReceiveACK2SendACK2Send2Receive2ReceiveACK3SendACK3Send3Receive3Windowsize=1SenderR

7、eceiverSend1Receive1ReceiveACK2SendACK2Send2Receive2ReceiveACK3SendACK3Send3Receive3ReceiveACK4SendACK4TCPSimpleAcknowledgmentTCPSequenceandAcknowledgmentNumbersSourcePortDest.Port…Sequence#Acknowledgement#102823SourceDest.11Seq.2Ack.1