帧是在数据链路层数据进行传输与交换的基本单位。构造帧对于理解网络协议的概念、协议执行过程以及网络问题处理的一般方法具有重要的意义。本次课程设计的目的是应用数据链路层与介质访问控制层的知识，根据数据链路层的基本原理，通过构造一个具体的Ethernet帧，从而深入理解网络协议的基本概念与网络问题处理的一般方法-fr a me is the data link layer data transmission and exchange of the basic unit. fr a me structure for understanding the concept of network protocols, protocol implementation and network general approach to deal with the problem of great significance. This course is designed to apply the data link layer and MAC layer knowledge, the data link layer of the basic principles, by constructing a specific Ethernet fr a me, so in-depth understanding of the basic concepts of network protocol processing and network problems General Methods