packet和frame区别(数据链路层和网路层)
https://blog.csdn.net/kewbblog/article/details/9135551
https://blog.csdn.net/wenqian1991/article/details/42467643
TCP/UDP报文和传输过程(传输层)
https://blog.csdn.net/ght886/article/details/80055488
IP报文格式(网络层)
https://www.cnblogs.com/zhangbing12304/p/11016921.html
MTU 巨帧 TCP/UDP与分片
https://blog.csdn.net/zhengxianghdu/article/details/50673165
其他:
https://blog.csdn.net/wenqian1991/article/details/44042677
计算机网络各层主要协议报文格式详解