Computer Network Security Defense System in 5G Era

With the advent of the information age, people's demand for 5G mobile communication network is growing. Relevant studies show that network security attacks are still threatening the security of 5G networks to a large extent. This paper mainly studies the computer network security defense system in the age of 5G. Aiming at the practical problems of large-scale network security detection and defense, this paper systematically studies the technology of large-scale network security detection and defense strategy selection, builds a large-scale network security detection and defense strategy framework, uses the YOLOv5 algorithm to build a network intrusion detection model, and proposes an active defense strategy based on security domain.