Computer networking systems connect local area networks (LANs) in three main ways:
1. LANs use technologies like switches and routers to connect devices within a building or campus.
2. Metropolitan area networks (MANs) connect multiple LANs within a city using technologies like fiber optic cables.
3. Wide area networks (WANs) connect LANs over longer distances between cities using technologies like satellites or telecommunication lines.
Together, LANs, MANs, and WANs allow devices and users to share resources and communicate over both short and long distances.