Documenting a network is an essential job as it explains how the network is created, functions, and provides detailed instructions on how to troubleshoot problems, implement upgrades, and provide the proper blueprints needed for future network expansions. It should describe every section of the network in a simple to understand manner. Documenting a network is crucial for both troubleshooting and supporting the system. Additionally, network documentation plays a substantial role in implementing changes to the hardware or software.
The link below is a sample template I created that you can use to begin this process; hope it helps!