COMPOSITION METHOD AND COUNTERMEASURE COMMUNICATIONS NETWORK SYSTEM AGAINST CYBER SECURITY CONSIDERING THE DEFENSE-IN-DEPTH AND DIVERSITY OF INSTRUMENTATION AND CONTROL SYSTEM IN NUCLEAR POWER PLANT

摘要

PURPOSE: A communication network system and a configuring method corresponding to a cyber security are provided to configure a communication network between a barrier layer by corresponding to the cyber security. CONSTITUTION: A communication network between a plurality of defense layers is configured. Firewalls(250,260,270) is arranged between the plurality of barrier layers. Network switches(211,221,231,241,242,243) is installed in the center of a star topology. The network switch controls the communication among the plurality of barrier layers and the communication node inside a plurality of barrier layers.