The first guarantee of database security is

The first guarantee of database security is the security of the network system. The firewall is a security wall between the internal database and the external network. It can intercept intrusions and influences from the outside.

Firewall technology helps computer networks to integrate into their internal and external networks by organically combining various software and hardware devices for security management and screening. A technology that builds a relatively isolated protective barrier to protect the security of user data and information. (Recommended learning: web front-end video tutorial)

The function of firewall technology is mainly to promptly discover and deal with possible security risks, data transmission and other problems when the computer network is running, among which The processing measures include isolation and protection. At the same time, various operations in computer network security can be recorded and tested to ensure the security of computer network operations, protect the integrity of user data and information, and provide users with better and safer services. Computer network experience.

Firewall is an important component of modern network security protection technology, which can effectively protect against external intrusion and influence. With the improvement of network technology, the functions of firewall technology are also constantly improving, which can filter information and ensure the security of information.

A firewall is a defense system that plays a role in the intermediate process between internal and external networks. It has the value and role of security protection. Through the firewall, it can realize the effective circulation of internal and external resources and handle various security issues in a timely manner. hidden dangers, thus improving the security of information data.

Firewall technology has certain anti-attack capabilities and can protect itself from external attacks. With the advancement of computer technology, firewall technology is also constantly developing.

(1) Filtering firewall

Filtering firewall is in the network layer and transport layer. It can analyze based on the address of the data source and protocol type and other flag characteristics to determine whether able to pass. Information can only be transmitted if it meets the standards specified by the firewall and meets the security performance and type. Some unsafe factors will be filtered and blocked by the firewall. [5]

(2) Application proxy type firewall

The main working scope of the application proxy firewall is at the highest layer of OIS, located above the application layer. Its main feature is that it can completely isolate the network communication flow, and can realize the supervision and control of the application layer through a specific agent program. These two firewalls are more commonly used firewalls, and other firewalls are also more effective. In actual applications, the type of firewall must be reasonably selected based on specific needs and conditions, so that problems such as external intrusion of the firewall can be effectively avoided. 's appearance. [5]

(3) Composite

The currently widely used firewall technology is composite firewall technology, which combines the advantages of packet filtering firewall technology and application proxy firewall technology, such as If the security policy is a packet filtering policy, then access control can be carried out on the header part of the message; if the security policy is a proxy policy, access control can be carried out on the content data of the message, so the composite firewall technology combines its components. The advantages of both firewalls are eliminated, and the original shortcomings of the two firewalls are eliminated, greatly improving the flexibility and security of firewall technology in application practice.

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