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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 communicationsamong users and allows users to share resources with other users. Networks may be classified according to a wide variety of characteristics. This article provides a general overview of types andcategories and also presents the basic components of a network.

Introduction

← A computer network allows sharing of resources and information among devices connected to the network. The AdvancedResearch Projects Agency (ARPA) funded the design of the Advanced Research Projects Agency Network (ARPANET) for the United States Department of Defense. It was the first operational computer network inthe world.[1] Development of the network began in 1969, based on designs developed during the 1960s. For a history see ARPANET, the first network.

Network classification

← Connection method← 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, Humana, Power line communication or G.hn.
← Ethernet uses physical wiring to connect devices. Frequently deployed devices include hubs, switches, bridges and/or routers. Wireless LANtechnology 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, phonelines and power lines) to create a high-speed (up to 1 Gigabit/s) local area network.

Wired Technologies

← Twisted pair wire is the most widely used medium for telecommunication. Twisted-pairwires are ordinary telephone wires which consist of two insulated copper wires twisted into pairs and are used for both voice and data transmission. The use of two wires twisted together helps to...
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