【网络】OSI七层模型和TCP/IP五层模型

参考 

OSI七层模型和TCP/IP五层模型

https://www.cnblogs.com/qishui/p/5428938.html

以太网数据格式与封装解封

https://www.cnblogs.com/qishui/p/5437301.html

OSI七层模型详解

https://blog.youkuaiyun.com/yaopeng_2005/article/details/7064869

图解OSI七层模型

https://www.jianshu.com/p/9b9438dff7a2