OSI 7 layer diagram

https://www.edrawsoft.cn/%e4%b8%83%e5%b1%82%e7%bd%91%e7%bb%9c%e6%a8%a1%e5%9e%8b%e6%80%8e%e4%b9%88%e7%94%bb%ef%bc%9f5%e4%b8%aa%e6%ad%a5%e9%aa%a4%e5%ae%8c%e6%88%90%e4%b8%93%e4%b8%9a%e7%bd%91%e7%bb%9c%e6%a8%a1%e5%9e%8b/

https://www.cnblogs.com/cangqiongbingchen/p/5038479.html