(How to build and maintain a local area network with 30 people This is my experience on the formation and management of a small local area network with 30 people. 1. Set up LAN hardware: The key is how big the network you want to set up, 3 or 5 small ones, just use the hub. It is not introduced here, it is relatively simple. Here is an introduction to a network of about 30 people. The hardware required is a modem (also called a cat), routers, switches, and some network cables, sockets, etc.)