This document provides an overview of computer networks. It defines standalone and networked computer systems, and describes local area networks (LANs) and wide area networks (WANs). LANs connect computers over short distances using technologies like copper wire, fiber optic, or wireless. WANs connect computers across large areas using fiber optic, microwave transmission, or satellite links. The document outlines advantages of networks like sharing hardware and files. It also discusses network security methods involving passwords, encryption, and physical access controls. Finally, it introduces client/server networks, network interface cards, and defines freeware and shareware software.

1. Networks Mr Arthur