Why use a firewall? What is the function of firewall?

Traditional firewalls involve two interpretations , A physical firewall is , A wall built in a house for fire protection , In the definition of network , Firewall refers to the defense system between the local network and the external network , It is a network security mode , Be able to isolate risks , Protect the local network , So why use firewalls ？ What is the function of firewall ？

A firewall

Why use a firewall

The firewall is located in the middle of the internal and external network , It can protect the intranet very well , If intrusion is involved , Intruders need to break the firewall first , Only then has the opportunity to invade the intranet network , So firewall is widely used in LAN , Protect network security . For businesses , Using ordinary firewall level is not enough to protect internal data files , The firewall of an enterprise needs to use a higher level , The higher the firewall level , The stronger the security line .

What is the function of firewall

Firewall has filtering function , The firewall is like a filter installed in the internal and external network , Healthy content will flow into the intranet through the firewall , Viral 、 Risky website content will be isolated by the firewall , Protect network security by filtering data , Secondly, the firewall can manage the access text , Block some risk actions and businesses , If there is a cyber attack , There will be an early warning .

With the development of the Internet , There are common risks in intranet security , Firewall has become an indispensable existence in LAN , Using firewall can not only make the information entering the intranet safe and healthy , It also resists the intrusion of bad information , In this way, users will not leak information in the process of using the web page 、 Web page poisoning and other phenomena , Help ensure network usage requirements .