This document summarizes fundamental network classifications and provides an overview of computer networking. It defines LAN as a local network connecting devices within a small geographic area like a home, school, or office building. WAN is described as connecting computers over large distances, across states, countries or globally, such as the Internet. MAN is presented as a type of network connecting devices within cities or counties, with a coverage distance between LAN and WAN. The document concludes with an overview of topics covered including network classifications, topologies, and devices.