Computer Network

A computer network, often simply referred to as a network, is a collection of computers and devices connected by communications channels that facilitates communications among users and allows users to share resources with other users.This article provides a general overview of types and categories and also presents the basic components of a network.

Computer networks can be classified according to the hardware and software technology that is used to interconnect the individual devices in the network, such as optical fiber, Ethernet, Wireless LAN, HomePNA, Power line communication or G.hn.

Ethernet uses physical wiring to connect devices. Frequently deployed devices include hubs, switches, bridges and/or routers. Wireless LAN technology is designed to connect devices without wiring. These devices use radio waves or infrared signals as a transmission medium. ITU-T G.hn technology uses existing home wiring (coaxial cable, phone lines and power lines) to create a high-speed (up to 1 Gigabit/s) local area network.

Networks may be classified according to a wide variety of characteristics.

Types of networks

Personal area network

Local area network

Internetwork

intranets and extranets

Virtual private network

Internet

Metropolitan area network

Enterprise Private Network

Wide area network

Campus network

Home area network

Overlay Network

Global area network

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