C语言双语课件 CHAPTER2.ppt

计算机网络与通信Data and Computer Communications 2. 协议体系结构, TCP/IP, 互联网应用 Protocol Architecture, TCP/IP, and Internet-Based Applications Protocol Architecture, TCP/IP, and Internet-Based Applications To destroy communication completely, there must be no rules in common between transmitter and receiver—neither of alphabet nor of syntax —On Human Communication, Colin Cherry Contents Contents Contents Operation of TCP/IP TCP Header UDP Header IP Header IPv6 Header Some TCP/IP Protocols 思考题 协议是什么？为什么需要协议？ 协议构成的基本要素是什么？ 协议体系结构为什么采用分层的方法？优缺点？ 三层简单协议体系结构中，各层协议完成的功能？ 网络系统中的两级地址是？ 靠什么来传递对等层协议相关信息？ 协议体系结构的工作？ TCP/IP协议包括哪五个部分？ Contents 协议分层的理解 请举一日常生活中的例子来形象地描述该模型中各层的peer-to-peer protocol（对等协议）和上下层之间的interface（接口）。 北大学生张明给理工大学生李强写信的例子 张明写信 李强读信 封入信封 拆开信封 投入信箱 从信箱中取信件 收信分检装邮包 开邮包选路投递 邮包送转运站 从转运站取回邮包 装列车箱发运 列车箱卸包送转运站 2.4 Standardized Protocol Architectures Layer Specific Standards特定层的标准 Primitive Types Service Primitives （原语） and Parameters define services between adjacent layers using: primitives to specify function performed parameters to pass data and control info Contents Contents Multimedia Technologies Summary introduced need for protocol architecture TCP/IP protocol architecture protocol architecture standardization multimedia application needs 协议的关键要素 TCP/IP协议体系结构 Assignments Part 1 2.1 Multiple choice 1. Which of the following is NOT the key elements of a protocol? A. syntax 　 B. semantics　　 C. rule　　　　 D. timing 2.1 Multiple choice 2-5. The layers in TCP／IP protocol architecture are 2 , In transport layer, TCP provides 3 data transmission，and UDP provides 4 data transmission. In network layer, IP provides 5 packet transmission. 2. A．transport layer, internet layer, network access layer, physical layer B．application layer, transport layer, internet layer, network access layer, phys