They will assist in multiple ways for the upkeep of the essential network which runs in the 24/7 environment. They take part actively to determine the economic and technical viability of organizational network infrastructure. Engineers are highly engaged to assist Network Operation Centers (NOC) for seamless operations. You as a Network Planner holds significant job responsibilities for the organization by leveraging the network skills. Engineers make use of technical skills for the network in association with the project management of given network engineering discipline.  https://www.fieldengineer.com/skills/network-planning-engineer In case of network failure during peak hours there should be a backup plan in place much before commencing the network driven production. If the Engineers do not document such plans, it may cause the irreversible loss that can be catastrophic at times.