Currently, the issue of computer network security becomes more and more serious. This thesis takes the main factors that affect the computer network security as the breakthrough, and pays attention to the analysis and prevention of various measures that are not conducive to the normal operation of computer network. It also fully discusses the situations that affect the computer network security from different perspectives in order to take preventive measures, remove adverse factors in the embryonic stage and ensure the security management and effective operation of computer network. This thesis proposes solutions from seven aspects, namely security and encryption technology, firewall technology, network address translator technology, security kernel technology of operating system, technology of anti virus in computer network, network backup system and security management.
