Answer: Change management
Explanation: Change management is the mechanism which helps to deal with the change implementation properly and effectively, controlling the change plan and adaption of change by the members of any organization or company and devices.
The situation mentioned in the question is not having the change management plan implementation properly.The repaired server that was assigned with the address that is not executing properly due to the changes that are made while repairing. Thus, proper change management mechanism will solve the issue.
Change management is a systematic approach to dealing with the transition or transformation of an organization's goals, processes or technologies. The purpose of change management is to implement strategies for effecting change, controlling change and helping people to adapt to change.