BHBIN-E_01_网络基础(v2.0)

BHBIN—1-1Copyright©2003,.Copyright©2003,BHBIN-E-1اBHBIN—1-2Copyright©2003,.Copyright©2003,BHBIN-E-1—1-3Copyright©2003,.Copyright©2003,BHBIN-E-1—1-4Copyright©2003,.Copyright©2003,BHBIN-E-1—1-5Copyright©2003,.Copyright©2003,BHBIN-E-1(TCP)UserDatagramProtocol(UDP)“”“”BHBIN—1-6Copyright©2003,.Copyright©2003,BHBIN-E-1(16)Destinationport(16)Sequencenumber(32)Headerlength(4)Acknowledgementnumber(32)Reserved(6)Codebits(6)Window(16)Checksum(16)Urgent(16)Options(0or32ifany)Data(varies)Bit0Bit15Bit16Bit3120Bytes•—•—•—•—•—“”•—•—•—BHBIN—1-7Copyright©2003,.•——“”•—•—•—BHBIN—1-8Copyright©2003,.Copyright©2003,BHBIN-E-1—1-9Copyright©2003,.Copyright©2003,BHBIN-E-1……A102810282323……SPDPZTelnetZ23Telnet.BHBIN—1-10Copyright©2003,.Copyright©2003,BHBIN-E-1(seq=100ctl=SYN)SYNreceivedHostAHostB1BHBIN—1-11Copyright©2003,.Copyright©2003,BHBIN-E-1(seq=100ctl=SYN)SYNreceivedSendSYN,ACK(seq=300ack=101ctl=syn,ack)HostAHostBSYNreceived12Copyright©2003,BHBIN-E-1(seq=100ctl=SYN)SYNreceivedSendSYN,ACK(seq=300ack=101ctl=syn,ack)Established(seq=101ack=301ctl=ack)HostAHostB123SYNreceivedBHBIN—1-12Copyright©2003,.Copyright©2003,BHBIN-E-1—1-13Copyright©2003,.Copyright©2003,BHBIN-E-1©2003,BHBIN-E-1•1BHBIN—1-14Copyright©2003,.Copyright©2003,BHBIN-E-1©2003,BHBIN-E-1•1BHBIN—1-15Copyright©2003,.Copyright©2003,BHBIN-E-1……Sequence#Sequence#Acknowledgement#Acknowledgement#SourceDest.Seq.Ack.102823101Ijustsent#10.ABBACopyright©2003,BHBIN-E-1……Sequence#Sequence#Acknowledgement#Acknowledgement#102810282323SourceDest.101010Seq.11Ack.102810282323SourceDest.111111Seq.11Ack.Ijustsent#10.ABBHBIN—1-16Copyright©2003,.Copyright©2003,BHBIN-E-1……Sequence#Sequence#Acknowledgement#Acknowledgement#102810282323SourceDest.111111Seq.22Ack.102810282323SourceDest.101010Seq.11Ack.102810282323SourceDest.111111Seq.11Ack.Ijustgot#10,nowIneed#11.Ijustsent#11.ABATCP11BB11ACopyright©2003,BHBIN-E-1……Sequence#Sequence#Acknowledgement#Acknowledgement#102810282323SourceDest.111111Seq.22Ack.102810282323SourceDest.101010Seq.11Ack.102810282323SourceDest.111111Seq.11Ack.102810282323SourceDest.121212Seq.22Ack.Ijustgot#11,nowIneed#12.Ijustsent#11.ABBHBIN—1-17Copyright©2003,.Copyright©2003,BHBIN-E-1“”TCP“”BHBIN—1-18Copyright©2003,.Copyright©2003,BHBIN-E-1=3Send2Windowsize=3Send1Windowsize=3Send32Copyright©2003,BHBIN-E-1=3Send2Windowsize=3Send1Windowsize=3Send3ACK3Windowsize=2Packet3isDroppedBHBIN—1-19Copyright©2003,.Copyright©2003,BHBIN-E-1=3Send2Windowsize=3Send1Windowsize=3Send3ACK3Windowsize=2Packet3isDroppedWindowsize=2Send4Windowsize=2Send32Copyright©2003,BHBIN-E-1=3Send2Windowsize=3Send1Windowsize=3Send3ACK3Windowsize=2Packet3isDroppedWindowsize=2Send4Windowsize=2Send3ACK5Windowsize=2BHBIN—1-20Copyright©2003,.Copyright©2003,BHBIN-E-1•Sourceport(16)Destinationport(16)Length(16)Data(ifany)1Bit0Bit15Bit16Bit31Checksum(16)8Bytes•—•—•—•—BHBIN—1-21Copyright©2003,.Copyright©2003,BHBIN-E-1•OSITCP/IPInternetProtocol(IP)InternetControlMessageProtocol(ICMP)AddressResolutionProtocol(ARP)ReverseAddressResolutionProtocol(RARP)InternetProtocol(IP)InternetControlMessageProtocol(ICMP)AddressResolutionProtocol(ARP)ReverseAddressResolutionProtocol(RARP)ApplicationTransportInternetNetworkAccessBHBIN—1-22Copyright©2003,.Copyright©2003,BHBIN-E-1(4)DestinationIPAddress(32)Options(0or32ifany)Data(variesifany)1Bit0Bit15Bit16Bit31HeaderLength(4)Priority&TypeofService(8)TotalLength(16)Identification(16)Flags(3)Fragmentoffset(13)Timetolive(8)