What is Computer Network? - A computer network is a set of computers sharing resources located on or provided by network nodes. Computers use common communication protocols over digital interconnections to communicate with each other.


  • LAN(Local Area Network)
  • PAN(Personal Area Network)
  • MAN(Metropolitan Area Network)
  • WAN(Wide Area Network)
LAN(Local Area Network)
-A local area network (LAN) is a collection of devices connected together in one physical location, such as a building, office, or home.

-A LAN can be small or large, ranging from a home network with one user to an enterprise network with thousands of users and devices in an office or school.

-a LAN's single defining characteristic is that it connects devices that are in a single, limited area. 


PAN(Personal Area Network)
-A personal area network (PAN) connects electronic devices within a user's immediate area. The size of a PAN ranges from a few centimeters to a few meters.

-PAN network connections can either be wired or wireless. Wired connection methods include USB and FireWire; wireless connection methods include Bluetooth (the most common), WiFi, IrDA, and Zigbee.

-PANs can also connect laptops, tablets, printers, keyboards, and other computerized devices.

  • MAN(Metropolitan Area Network)


-A metropolitan area network (MAN) is a computer network that connects computers within a metropolitan area, which could be a single large city, multiple cities and towns, or any given large area with multiple buildings.

-MANs typically combine the networks of multiple organizations, instead of being managed by a single organization.

-MANs do not have to be in urban areas; the term "metropolitan" implies the size of the network, not the demographics of the area that it serves.

-Most MANs use fiber optic cables to form connections between LANs. Often a MAN will run on "dark fiber" — formerly unused fiber optic cables that are able to carry traffic. These fiber optic cables may be leased from private-sector Internet service providers (ISP).

In some cases, this model is reversed: a city government builds and maintains a metropolitan fiber optic network, then leases dark fiber to private companies.

  • WAN(Wide Area Network)

-WAN(Wide Area Network) is a large network of information that is not tied to a single location.

-WANs can facilitate communication, the sharing of information and much more between devices from around the world through a WAN provider.


-As described above, wide area networks are a form of telecommunication networks that can connect devices from multiple locations and across the globe. WANs are the largest and most expansive forms of computer networks available to date.

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