This document summarizes different types of computer networks including local area networks (LAN), metropolitan area networks (MAN), and wide area networks (WAN). It also describes client-server and peer-to-peer network architectures, as well as common network topologies like bus, ring, and star. Additionally, it outlines different network communication technologies such as intranet, extranet, and internet. The document was created by Sehajbir Singh of Class VIII-E to provide an overview of computer network types, architectures, topologies, and communication technologies.