Firewall technology is a technology that organically combines all kinds of software and hardware devices used for security management and screening to help computer networks build a relatively isolated protection barrier between their internal and external networks, so as to protect user data and information security.

The main function of firewall technology is to discover and deal with the security risks and data transmission problems that may occur when the computer network is running in time. The treatment measures include isolation and protection, and at the same time, it can record and detect various operations in computer network security.

Ensure the safety of computer network operation, ensure the integrity of user data and information, and provide users with a better and safer computer network experience.

Extended data:

Main types of firewalls:

1, filter the firewall

The filtering firewall is in the network layer and the transport layer, and can be analyzed according to the address and protocol type of the data source to determine whether it can pass.

Under the standard of firewall, information can only be transmitted if the security performance and type are met, and some unsafe factors will be filtered and blocked by firewall. ?

2. Apply proxy type firewall

The main working scope of application proxy firewall is at the highest level of OSI, above the application layer. Its main feature is that it can completely isolate the network communication flow and monitor the application layer through a specific agent program. ?

3. Compound type

At present, the widely used firewall technology belongs to composite firewall technology, which combines the advantages of packet filtering firewall technology and proxy firewall technology. For example, if the security policy sent is a packet filtering policy, access control can be performed on the header part of the message.

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