Several important aspects of establishing a network security system

Network security means that the hardware, software, and data in the network system are protected from accidental or malicious damages, changes, leaks, and continuous, reliable, and normal operation of the system, the network service is not interrupted. Network security is essentially network information security, including static Information Storage Security and Information Transmission Security. The following describes some important aspects of establishing a network security system.
1. Firewall
The firewall is a security guard between the enterprise network and the Internet. The main purpose of the firewall is to intercept unwanted traffic, such as worms that are prepared to infect computers with specific vulnerabilities; in addition, many hardware firewalls provide other services, such as email anti-virus, anti-spam filtering, content filtering, and secure wireless access point options.
In environments without a firewall, network security fully depends on the security of the primary system. In a sense, all master systems must work together to achieve even and consistent advanced security. The larger the subnet, the smaller the manageability capability of keeping all the primary systems at the same level of security. As security errors and errors become more common, intrusion occurs from time to time.
The firewall helps improve the overall security of the Master System. The basic concept of firewall-not to protect the system of each host, but to allow all access to the System through a certain point and to protect this point, and shield the information and structure of the protection network as much as possible.
Firewall is an effective and widely used network security mechanism to prevent the spread of insecure factors on the Internet to the LAN. The firewall can obtain, store, and manage relevant information from various layers of communication protocols and applications, so as to implement access security decision-making control of the system. The firewall technology has gone through three stages: packet filtering, proxy, and status monitoring.
2. Prevention of Network Viruses
In the network environment, the spread of viruses is accelerating. It is difficult to completely clear Network viruses with only the stand-alone anti-virus software. Therefore, all-round Anti-Virus products suitable for LAN must be available. If you use email to exchange information within the network, you also need a mail anti-virus software based on the mail server platform. Therefore, it is best to use All-Round Anti-Virus products to set the corresponding anti-virus software for all possible virus attack points on the network, and regularly or irregularly update the virus database to protect the network from virus attacks.
3. System Vulnerabilities
To solve network layer security problems, you must first understand the security risks and weaknesses in the network. In the face of the complexity and changes of large-scale projects, it is unrealistic to find security vulnerabilities and risk assessment by relying solely on the technical and experience of administrators. The best way is to use the security scan tool to find vulnerabilities and propose suggestions for modification. In addition, patching the operating system and software in real time can also make up for some of the vulnerabilities and risks. Experienced administrators can also use hacker tools to simulate attacks on the network to find Network Vulnerabilities.
4. Intrusion Detection
Intrusion detection technology is designed and configured to ensure the security of computer systems. It can detect and report unauthorized or abnormal phenomena in the system in a timely manner, is a technology used to detect violations of security policies in computer networks. The use of audit records in the intrusion detection system can identify any desired behavior, so as to limit these activities and protect system security.
5. Intranet system security
External network intrusion can be solved by installing a firewall, but internal network intrusion is powerless. In this case, we can use an AUDIT file with certain functions for each subnet to provide a basis for the Administrator to analyze the network operation status. A dedicated subnet listener is designed to monitor the interconnection between computers in the subnet and provide backup for audit files of each server in the system.
Enterprises' information security requirements are mainly reflected in the urgent need for comprehensive solutions suitable for their own situations. With the development of time, the security problems faced by small and medium-sized enterprises will be further complicated and in-depth. As more and more SMEs build their intellectual assets on the basis of their information facilities, their demands for information security will also grow rapidly.
In short, network security is a system project. instead of relying solely on firewalls and other individual systems, you must carefully consider the security requirements of the system and integrate various security technologies, combined with scientific network management, an efficient, universal, and secure network system can be generated.