Large and medium-sized park networks usually adopt a tree-shaped network architecture with the core layer as the "root". The topology is stable, and it is easy to expand and maintain. The park network can be divided into multiple layers: the access layer, the aggregation layer, and the core layer, as well as multiple partitions: the egress UTM (Unified Threat Management) unified security gateway area, the DMZ (Demilitarized Zone) area, etc. Each functional partition module is clear, and the scope involved in internal adjustments of the modules is small, making it easy to locate problems.