When Two devices or more then devices are connected together and able to exchange information/data is called network. Networks are known as a medium of connections between nodes (set of devices) or computers. A network is consist of group of computer systems, servers, networking devices are linked together to share resources, including a printer or a file server. The connections is established by using either cable media or wireless media.
A Computer network can be categorized by their size. A computer network is mainly of four types
> PAN(Personal Area Network)
> LAN(Local Area Network)
> MAN(Metropolitan Area Network)
> WAN(Wide Area Network)
Personal Area Network
> Personal Area Network is a network arranged within an individual person, typically within a range of 10 meters.
> Personal Area Network is used for connecting the computer devices of personal use is known as Personal Area Network.
> Thomas Zimmerman was the first research scientist to bring the idea of the Personal Area Network.
> Personal Area Network covers an area of 30 feet.
> Personal computer devices that are used to develop the personal area network are the laptop, mobile phones, media player and play stations.
LAN(Local Area Network)
Local Area Network is a group of computers connected to each other in a small area such as building, office.
LAN is used for connecting two or more personal computers through a communication medium such as twisted pair, coaxial cable, etc.
It is less costly as it is built with inexpensive hardware such as hubs, network adapters, and ethernet cables.
The data is transferred at an extremely faster rate in Local Area Network.
Local Area Network provides higher security.
MAN(Metropolitan Area Network)
> A metropolitan area network is a network that covers a larger geographic area by interconnecting a different LAN to form a larger network.
> Government agencies use MAN to connect to the citizens and private industries.
In MAN, various LANs are connected to each other through a telephone exchange line.
> The most widely used protocols in MAN are RS-232, Frame Relay, ATM, ISDN, OC-3, ADSL, etc.
> It has a higher range than Local Area Network(LAN).
Use of the MAN(Metropolitan Area Network)
> MAN is used in communication between the banks in a city.
> It can be used in an Airline Reservation.
> It can be used in a college within a city.
> It can also be used for communication in the military.
WAN(Wide Area Network)
> A Wide Area Networking is a network that extends over a large geographical area such as states or countries.
> A Wide Area Network is quite bigger network than the LAN.
> A Wide Area Network is not limited to a single location, but it spans over a large geographical area through a telephone line, fibre optic cable or satellite links.
> The internet is one of the biggest WAN in the world.
> A Wide Area Network is widely used in the field of Business, government, and education.
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