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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.csdn.net/yaopeng_2005/article/details/7064869
图解OSI七层模型
https://www.jianshu.com/p/9b9438dff7a2
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