[try to hack] firewall (I)

Blog home page ： Happy star The blog home page of
Series column ：Try to Hack
Welcome to focus on the likes collection ️ Leaving a message.
Starting time ：2022 year 7 month 26 Japan
The author's level is very limited , If an error is found , Please let me know , thank ！

Introduction to firewall

The firewall is between trusted and untrusted Networks , Set a series of security rules to control the access of communication packets between the two networks , Detect information exchanged on the network , Prevent illegal access to important information resources &#