TCP和UDP DNS DHCP OSPF的五種包:

TCP和UDP:

通俗易懂的TCP裏面的三次握手以及四次揮手

【網絡協議】TCP分段與IP分片

DNS :https://blog.csdn.net/weixin_42859280/article/details/105240137

DHCP報文如何交互的。https://blog.csdn.net/weixin_42859280/article/details/105185536

OSPF的五種包:https://blog.csdn.net/Mr_Bei/article/details/83412000
1、Hello包
2、DBD包(database description)
3、LSR包 (Link State Request)
4、LSU包(Link State Update)
5、LSACK包(Link State Acknowledgment)