What is network security and what are the common security measures?

Network security means that the hardware and software of the network system and the data in the system are protected from being destroyed, changed or leaked due to unexpected or malicious reasons, and the system runs continuously, reliably and normally without interrupting the network service.

What are the network security measures?

1. Physical measures: such as protecting key network equipment (such as switches, large computers, etc.). ), formulate strict network security rules and regulations, and take measures such as radiation protection, fire prevention and installation of uninterruptible power supply (UPS).

2. Access control: strictly authenticate and control users' access to network resources. For example, user authentication, password encryption, update and authentication, setting user access to directories and files, controlling network device configuration rights, and so on.

3. Data encryption: Encryption is an important means to protect data security. The function of encryption is to ensure that the information cannot be read after being intercepted. Prevent computer network virus and install network anti-virus system.

4. Network isolation: There are two ways of network isolation, one is through isolation card, and the other is through network security isolation gateway. Isolation cards are mainly used to isolate single machines, and gateways are mainly used to isolate the whole network. The difference between the two can be found in resources.

5. Other measures: Other measures include information filtering, fault tolerance, data mirroring, data backup and auditing. In recent years, many solutions have been put forward around network security issues, such as data encryption technology and firewall technology. Data encryption is to encrypt the data transmitted in the network, and then decrypt and restore it to the original data after reaching the destination to prevent illegal users from stealing information after interception. Firewall technology is to control the access rights of the network by isolating and restricting the access to the network.