With the rapid development of computer network technology and the
popularization of computer network application, computer network has become
an important means of information acquisition, exchange and transmission in
all fields of today’s society. Although the research of network security defense
technology is a hot spot of network security research at present, the current
technology research only focuses on a single security technology, but seldom
considers how to integrate various security technologies to build a complete
network security defense system. Network security is a hot issue that people
pay great attention to in today’s society. This paper introduces the meaning of
network security and the types of network threats, and expounds the defense
technology to solve the network security problem.