计算机网络安全（Computer network security）.doc

计算机网络安全（Computer network security） With the continuous development of computer networks, the global information technology has become a major trend of human development. But because the computer network linking the diversity, uneven distribution of the terminal and network openness, connectivity and other features, resulting in the network vulnerable to hackers, malicious software and other illegal attacks, so network security is a critical issue. For military computer command network, C3I system and bank to transmit sensitive data, computer network system is very important for its security and security. Therefore, the above network must have strong security measures, otherwise, the network will be a useless and even endanger the national security network. Both in LAN and WAN, there are many factors, such as natural and man-made, which are vulnerable and potentially threatening. Therefore, the network security measures should be able to fully deal with various threats and vulnerabilities, so as to ensure the confidentiality, integrity and availability of network information. The main influencing factors of computer network security as a breakthrough, focusing on prevention is not conducive to the normal operation of the computer network, from different angles to fully understand the impact of computer network security, be aware of, will resolve the unfavorable factors in the bud, to ensure the safety of computer network management and operation With the development of computer network and the wide spread of Internet, information has become the core of modern social life. National government organizations, enterprises and institutions have not only established their own LAN system, but also connected to the Internet in various ways. It has become an important means of government office and enterprise development to set up images and expand business through internet. First, the definition of computer security The international organization for Standardization (ISO) wi