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. The following are the methods and measures I have prepared for you, hoping to help you with your study!

The harm of network security instability

There are many factors that cause computer information insecurity, including human factors, natural factors and accidental factors. Among them, human factors refer to some lawless elements taking advantage of loopholes in computer networks, or sneaking into computer rooms, stealing computer system resources, illegally obtaining important information, tampering with system data, destroying hardware equipment, and compiling computer viruses. Human factors are the biggest threat to computer information network security.

Network security technology

Virtual network technology

Virtual network technology is mainly based on the regional network switching technology ATM and Ethernet switching developed in recent years. Switching technology develops the traditional broadcast-based LAN technology into a connection-oriented technology. Therefore, the network management system has the ability to limit the communication range of the local area network, without passing through a high-cost router.

Firewall technology

Network firewall technology is a special network interconnection equipment, which is used to strengthen the access control between networks, prevent external users from illegally entering the internal network through the external network, access the internal network resources, and protect the internal network operating environment. It checks the data packets transmitted between two or more networks according to certain security policies to determine whether to allow communication between networks and monitor the network execution status. Firewall products mainly include fortress host, packet filtering router, application layer gateway proxy server and circuit layer gateway.

Virus protection technology

Virus has always been one of the main problems of information system security. Due to the extensive interconnection of the network, the transmission route and speed of the virus have been greatly accelerated. The ways of virus transmission are: 1 FTP and email. 2 spread through floppy disk, CD-ROM and magnetic tape. 3 spread through web browsing, mainly malicious Java control component websites. 4 spread through groupware system. The main technologies of virus protection are: 1 to prevent the spread of virus. Install virus filtering software on firewall, proxy server, SMTP server, network server and groupware server. Install virus monitoring software on desktop computer. 2 Check and remove the virus. Use antivirus software to check and remove viruses. 3 virus database upgrade. The virus database should be constantly updated and distributed to the desktop system. Install Java and ActiveX control scanning software on firewalls, proxy servers and PCs, and prohibit unauthorized downloading and installation of control components.

Intrusion detection technology

Using firewall technology, after careful configuration, it can usually provide safe network protection between internal and external networks and reduce network security risks. However, it is not enough to use only firewalls and network security: 1 Intruders can look for possible back doors behind firewalls. The intruder may be inside the firewall. Due to the limitation of efficiency, firewalls usually cannot provide real-time intrusion detection capabilities. Intrusion detection system is a new network security technology that has emerged in recent years. Its purpose is to provide real-time intrusion detection and take corresponding protection measures, such as recording evidence for tracking and recovery, disconnecting network connection, etc. Real-time intrusion detection ability is very important. First, it can deal with attacks from internal networks, and second, it can shorten the time for hackers to invade. Intrusion detection systems can be divided into two categories: host-based intrusion detection systems and network-based intrusion detection systems.

Security scanning technology

In the network security technology, another important technology is security scanning technology. The cooperation of security scanning technology with firewall and security monitoring system can provide a highly secure network. Security scanning tools are usually divided into server-based and network-based scanners. Folding authentication and digital signature authentication technology mainly solve the identification problem of both parties in the process of network communication. Digital signature, as a specific technology in identity authentication technology, can also be used to realize the non-repudiation requirement in communication.

technology

1. Enterprise's demand for technology. The headquarters and branches of an enterprise are connected through the Internet. As the Internet is a public network, its security must be guaranteed. We call the private network realized by public network virtual private network.

2. Digital signature Digital signature is the basis for verifying the identity of the sender and the integrity of the message. A public * * * key system such as RSA is based on a private/public * * * key pair as the basis for verifying the identity of the sender and the integrity of the message. CA uses the private key to calculate its digital signature, and anyone can verify the authenticity of the signature with the public key provided by CA. Forging digital signatures is not feasible in computing power.

3.IPSECIPSec, as an encrypted communication framework on IP v4 and IP v6, has been supported by most manufacturers, and is expected to be determined as IETF standard in 1998, which is the realized Internet standard. IPSec mainly provides encrypted communication function at the IP network layer. This standard adds a new header format, authentication header and encapsulated security payload ESP to each IP packet. IPsec uses ISAKMP/ oakley and SKIP to exchange keys, manage and encrypt communication and negotiate security association.