Computer Network

ü  A computer network is a telecommunications network that allows computers to exchange data.

ü  The physical connection between networked computing devices is established using either cable media or wireless media.

ü  The best-known computer network is the internet.

What is Computer Network?

·        A collection of computing devices that are connected in various ways in order to communicate and share resources.

·        Usually, the connections between computers in a network are made using physical wires or cables

·        However, some connections are wireless, using radio waves or infrared signals.

Types of Network

Based on the size and the coverage area, networks are categorized into the following types:

·        Personal Area Networks (PANs)

·        Local Area Networks (LANs)

·        Metropolitan Area Networks (MANs)

·        Wide Area Networks (WANs)

Personal Area Networks

·        A personal area network (PAN) is a computer network used for communication among computer and different information technological devices close to one person.

·        Is a small network established for communication between different devices, such as laptops, computers, mobiles, and PDAs.

·        A pan may include wired and wireless devices.

·        The reach of a pan typically extends to 10 meters.

Local Area Networks

·        A local area network (LAN) is a network that connects computers and devices in a limited geographical area such as a home, school, office building, or closely positioned group of buildings.

·        Each computer or device on the network is a node.

·        Wired LANs are most likely based on Ethernet technology.

Metropolitan Area Networks

·        It is relatively larger than LAN and extends across a city or a metropolitan.

·        It is created by connecting two or more LANs located at different locations in a city.

Wide Area Networks

·        A wide area network (WAN) is a computer network that covers a large geographic area such as a city, country, or spans even intercontinental distances.

·        A WAN uses a communications channel that combines many types of media such as telephone lines, cables, and air waves.

·        A WAN often makes use of transmission facilities provided by common carriers, such as telephone companies.

·        One of the most prominent examples of the existing wans is the Internet.

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