第3章 tcpip协议栈74700.doc

第3章 tcpip协议栈74700 第三章第三章?1999,Cisco Systems,Inc.8-1TCP/IP协议栈TCP/IP协议栈本章目标本章目标通过本章的学习，您应该掌握以下内容:?掌握TCP/IP分层模型?掌握TCP/IP分层模型?1999,Cisco Systems,Inc.cisco.ID8-2?掌握三次握手过程?理解OSI和TCP/IP模型的区别和联系TCP/IP介绍TCP/IP介绍主机Inter主机?1999,Cisco Systems,Inc.cisco.ID8-3早期的协议族全球范围TCP/IPTCP/IP协议族TCP/IP协议族765应用层表示层会话层会话层应用层?1999,Cisco Systems,Inc.cisco.ID8-45432432传输层网络层数据链路层物理层1主机到主机层Inter层1网络接入层应用层概述应用层概述应用层文件传输-TFTP*-FTP*-NFSE-Mail-SMTP?1999,Cisco Systems,Inc.cisco.ID8-5*路由器使用主机到主机层Inter层远程登陆-Tel*-rlogin*网络管理-SNMP*名称管理-DNS*网络接入层主机到主机层概述主机到主机层概述Transmission ControlProtocol(TCP)User DatagramProtocol(UDP)应用层主机到主机层面向连接非面向连接非面向连接?1999,Cisco Systems,Inc.cisco.ID8-6gInter层网络接入层TCP数据格式TCP数据格式Source port (16)Destination port (16)Sequence number (32)Acknowledgement number (32)Acknowledgement number (32)2020Bit0Bit15Bit16Bit31?1999,Cisco Systems,Inc.cisco.ID8-7Headerlength (4)Reserved (6)Code bits (6)Window (16)Checksum (16)Urgent (16)Options(0or32if any)Data(varies)Bytes端口号端口号FTPPTELLNETDNSSSNMMPTFTTPSMTTP应用层RIP?1999,Cisco Systems,Inc.cisco.ID8-8TCP端口号传输层UDP2123255369161161520520TCP端口号TCP端口号源端口目标端口Host AHostAHost ZTelZ?1999,Cisco Systems,Inc.cisco.ID8-9102823SPDP目标端口=23.发送SYN(seq=100ctl=SYN)接收SYNHost AHostBTCP三次握手TCP三次握手1?1999,Cisco Systems,Inc.cisco.ID8-10发送SYN(seq=100ctl=SYN)接收SYNHost AHostB1TCP三次握手TCP三次握手?1999,Cisco Systems,Inc.cisco.ID8-11发送SYN,ACK(seq=300ack=101ctl=syn,ack)接收SYN2发送SYN(seq=100ctl=SYN)接收SYNHost AHostB1TCP三次握手TCP三次握手?1999,Cisco Systems,Inc.cisco.ID8-12发送SYN,ACK(seq=300ack=101ctl=syn,ack)建立会话(seq=101ack=301ctl=ack)23接收SYNTCP连接建立TCP简单确认TCP简单确认发送方接收方?1999,Cisco Systems,Inc.cisco.ID8-13滑动窗口=1TCP简单确认TCP简单确认发送方接收方发送1接收1?1999,Cisco Systems,Inc.cisco.ID8-14滑动窗口=1TCP简单确认TCP简单确认发送方接收方发送1接收1接收ACK2发送ACK2?1999,Cisco Systems,Inc.cisco.ID8-15滑动窗口=1TCP简单确认TCP简单确认发送方接收方发送1接收1接收ACK2发送ACK2?1999,Cisco Systems,Inc.cisco.ID8-16滑动窗口=1发送2接收2TCP简单确认TCP简单确认发送方接收方发送1接收1接收ACK2发送ACK2?1999,Cisco Systems,Inc.cisco.ID8-17滑动窗口=1发送2接收2接收ACK3发送ACK3TCP简单确认TCP简单确认发送方接收方发送1接收1接收ACK2发送ACK2?1999,Cisco Systems,Inc.cisco.ID8-18滑动窗口=1发送2接收2接收ACK3发送ACK3发送3接收3发送方接收方发送1接收1接收ACK2发送ACK2TCP简单确认TCP简单确认?1999,Cisco Systems,Inc.cisco.ID8-19滑动窗口=1发送2接收2接收ACK3发送ACK3发送3接收3接收ACK4发送ACK4TCP顺序号和确认号TCP顺序号和确认号源端口目标端口顺序号#确认号#我发送#10.?1999,Cisco Systems,Inc.cisco.ID8-20Source Dest.Seq.Ack.102823101TCP顺序号和确认号我已收到#10我已收到#10,现在我需要#11.源端口目标端口顺序号#确认号#我发送#10.?1999,Cisco Systems,Inc.cisco.ID8-21102810282323Source Dest.10101010Seq.11Ack.102810282323Source Dest.11111111Seq.11Ack.TCP顺序号和确认号TCP顺序号和确认号端口源端口标端口目标端口号顺序号#确认号#我已收到#10我已收到#10,现在我需要#11.我发送#10.?1999,Cisco Systems,Inc.cisco.ID8-22102810282323Source Dest.11111111Seq.22Ack.102810282323Source Dest.10101010Seq.11Ack.102810282323Source Dest.11111111Seq.11Ack.TCP顺序号和确认号TCP顺序号和确认号端口源端口标端口目标端口号顺序号#确认号#我已收到#11我已收到#11,现在我需要#12.我发送#11?1999,Cisco Systems,Inc.cisco.ID8-23102810282323Source Dest.11111111Seq.22Ack.102810282323Source Dest.10101010Seq.11Ack.102810282323Source Dest.11111111Seq.11Ack.102810282323Source Dest.12121212Seq.22Ack.TCP窗口TCP窗口发送方接收方?1999,Cisco Systems,Inc.cisco.ID8-24TCP窗口TCP窗口Window size=3Send2发送方接收方Window size=3Send1?1999,Cisco Systems,Inc.cisco.ID8-25Window size=3Send3Window size=3Send2TCP窗口TCP窗口发送方Window size=3Send1接收方?1999,Cisco Systems,Inc.cisco.ID8-26Window size=3Send3ACK3Window size=2数据3被丢弃Window size=3Send2TCP窗口TCP窗口发送方Window size=3Send1接收方?1999,Cisco Systems,Inc.cisco.ID8-27Window size=3Send3ACK3Window size=2数据3被丢弃Window size=3Send4Window size=3Send3Window size=3Send2TCP窗口TCP窗口发送方Window size=3Send1接收方?1999,Cisco Systems,Inc.cisco.ID8-28Window size=3Send3ACK3Window size=2数据3被丢弃Window size=3Send4Window size=3Send3ACK5Window size=2UDP数据格式UDP数据格式Source port (16)Destination port (16)Length (16)1Bit0Bit15Bit16Bit31Checksum (16)8Bytes?1999,Cisco Systems,Inc.cisco.ID8-29没有顺序号和确认号Data(if any)Inter层概述Inter层概述Inter Protocol(IP)Inter ControlMessageProtocol(ICMP)Protocol(ICMP)应用层主机到主机层主机到主机层?1999,Cisco Systems,Inc.cisco.ID8-30OSI网络层对应的是TCP/IP的inter层Address ResolutionProtocol(ARP)Reverse AddressResolutionProtocol(RARP)Inter层网络接入层IP数据IP数据Version (4)1Bit0Bit15Bit16Bit31HeaderLength (4)Priority&Typeof Service (8)Total Length (16)Identification (16)Flags (3)Fragment offset (13)Time tolive (8)Time tolive (8)Protocol (8)Protocol (8)Header checksum (16)Header checksum (16)2020?1999,Cisco Systems,Inc.cisco.ID8-31Destination IPAddress (32)Options(0or32if any)Data(varies ifany)Source IPAddress (32)Bytes协议域协议域TransportLayerTCPUDPProtocolProtocolNumbers171766?1999,Cisco Systems,Inc.cisco.ID8-32决定上层协议InterLayerIPICMP协议ICMP协议ApplicationTransportDestination UnreachableUnreachable11?1999,Cisco Systems,Inc.cisco.ID8-33InterNetwork AessEcho(Ping)OtherICMPARP协议ARP协议我需要知道的物理地址.?1999,Cisco Systems,Inc.cisco.ID8-34IP:=?ARP协议ARP协议我知道你的请求，这是我的物理地址我需要知道的物理地址.?1999,Cisco Systems,Inc.cisco.ID8-35IP:=?ARP协议ARP协议我知道你的请求，这是我的物理地址我需要知道的物理地址.?1999,Cisco Systems,Inc.cisco.ID8-36IP:Ether:0800.0020.1111IP:=?ARP协议ARP协议我知道你的请求，这是我的物理地址我需要知道的物理地址.?1999,Cisco Systems,Inc.cisco.ID8-37映射IPEtherLocal ARPIP:Ether:0800.0020.1111IP:=?RARP协议RARP协议我的地址是多少？?1999,Cisco Systems,Inc.cisco.ID8-38Ether:0800.0020.1111IP=?RARP协议RARP协议我的地址是多少？我听到了广播你的地址是5.?1999,Cisco Systems,Inc.cisco.ID8-39Ether:0800.0020.1111IP=?RARP协议RARP协议我的地址是多少？我听到了广播你的地址是5.?1999,Cisco Systems,Inc.cisco.ID8-40Ether:0800.0020.1111IP:5Ether:0800.0020.1111IP=?RARP协议RARP协议我的地址是多少？我听到了广播你的地址是5.?1999,Cisco Systems,Inc.cisc