用TCP/pletionofthischapter,youwillbeabletoperformthefollowingtasks:IdentifytheIPprotocolstack,itsprotocollayer functions,,IPaddresses, masks,worknumbers,numbers,and -Data-LinkPhysical1应用层*Data-LinkPhysicalFileTransfer -TFTP* -FTP* -NFSE-Mail -SMTPRemoteLogin -* -workManagement -SNMP*NameManagement -DNS*传输层TransmissionControlProtocol(TCP)UserDatagramProtocol(UDP)Data-LinkPhysicalConnection-Oriented ConnectionlessTCP段格式SourcePort(16)DestinationPort(16)SequenceNumber(32)Header Length(4)AcknowledgmentNumber(32)Reserved(6)CodeBits(6)Window(16)Checksum(16)Urgent(16)Options(0or32ifAny)Data(Varies)20 BytesBit0Bit15Bit16Bit31端口号TCPPort NumbersF T PTransport LayerT E L N E TD N SS N M PT F T PS M T PUDPApplication Layer2123255369161R I P520TCP端口号SourcePortDestinationPort…HostA102823…ZDestinationport=23. (seq=100ctl=SYN)SYNReceivedHostAHostBTCP三次握手1
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