一、因特网概述 二、因特网的产生和发展 三、因特网的功能和服务模式 四、因特网的体系结构

一、必要条件: 1 PostNuke0.726N的 Winzip压缩包 2 网上主机空间(login:ya########) 3 网上空间支持PHP和 MySQL

一、为实时应用程序提供标准化格式的分组 二、一般在UDP之上运行 三、有定义的首部字段如下

一、应用程序和应用层协议 应用程序:沟通,分布式的进程

Summary of mac protocols What do you do with a shared media? Channel Partitioning by time, frequency or code Time Division, Code Division, Frequency Division Random partitioning dynamic

Chapter 7: Network security Foundations: what is security? crypfography authentication message integrity key distribution and certification Security in practice: application layer: secure e-mail

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

Link Layer: setting the context actual PDu flow Router r1 applicatio pp lication transport trar sport network net vork data link