Network layer functions transport packet from sending to receiving hosts network layer protocols in physical every host, router data link physical data link

TCP segment structure 32 bits URG: urgent data (generally not used) source port #f dest port counting by bytes sequence number

IP datagram format IP protocol version 32 bits Imber total datagram header lenath lver/head pe length(bytes) (bytes) Hlen service

Chapter Overview: understand principles transport layer services behind transport layer 0multiplexing/demultiplexing services: 0connectionless transport: UDP multiplexing/demultiplex

Part 2: Application Layer Our goals: More chapter goals conceptual specific protocols implementation http aspects of network ftp

第12讲网页设计与编程(三) 一、CG概念和PHP程序设计基础

一、什么是安全性? 二、密码术 三、报文鉴别

一、了解多媒体网络的应用要求 二、多媒体的网络应用

TEEE80211无线LANp128-129 一、无线LANs:不拘范围(经常是移动的)联网形态 二、TEEE802.11标准

一、TP分包&重组 网络链路具有MTU(最大传输单位〕属性-是有链路层最大帧的限制决定的O不同类型的链路,不同的fragmentation: