Abstract
The network configuration in the system infrastructure is getting large scale, complicated in recent years, and the risk in the network change operation increases. Especially, the configuration change of the networking components (Routers, Switches, Firewalls etc.) is not limited to a specific system, and there is a possibility of influencing over two or more systems. Therefore, it is preferable to settle on the risk, probability, influence, workaround, countermeasures on falure, and judge the change risk from two or more viewpoints. In this text, risk management in the network change work that the author had practiced was considered from technical viewpoint.
