Firewall is an access control measure implemented when two networks communicate, which can prevent hackers in the network from accessing your network to the maximum extent. Refers to the combination of a series of components set between different networks (such as trusted intranet and untrusted public network) or network security domains.
It is the only entrance and exit of information between different networks or network security domains. It can control (allow, deny and monitor) the information flow in and out of the network according to the enterprise's security policy, and has strong anti-attack ability. It is the infrastructure to provide information security service and realize network and information security.
Logically speaking, firewall is a separator, limiter and analyzer, which effectively monitors any activity between intranet and Internet.
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Features:
Firewall needs to strictly control the exchange of information, create a healthy network environment, and block dangerous network information from the computer communication system. All information entering the intranet needs to be checked by firewall technology. Once the firewall technology detects the communication information that does not conform to the Internet specification, it will start the self-defense program and delete the information.
The wide application of computers has promoted great changes in people's life and production mode, and gradually changed the management mode of enterprises. The wide application of Internet technologies such as e-commerce and electronic payment not only provides convenience for people, but also provides opportunities for some lawless elements.
Some hackers even use the security loopholes in computer network systems to steal other people's data and information at will to achieve their own economic goals and cause serious economic losses to others. Firewall technology can give full play to the role of security protection and prevent illegal information from entering the computer computing system during the information exchange between internal and external networks.
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