Research on Network Security System and Its Development Trend

Network security is a complicated system engineering issue,and to guarantee network security,it is necessary to set up a whole set of security insurance system and adopt advanced security insurance techniques and management methods.The paper introduces first the concept and characteristics of computer network security,then analyzes how to achieve network security by using network security policy and security technologies.It thoroughly discusses a network security system based on AP2DR2,which is a multi-level and comprehensive dynamic defense system.The development trend of network security system is the transformation from static and passive state to dynamic and active state.