There are three type of Computer Network :–

         1. Local Area Network ( LAN)

         2. Metropolitan Area Network ( MAN) 

         3. Wide Area Network (WAN)

1. Local Area Network (LAN) :—

                         Most LANs connect workstations and personal computers. Each node (individual computer) in a LAN has its own CPU with which it executes programs, but it is also able to access data and
devices anywhere on the LAN. This means that many users can share expensive devices, such as laser
printers, as well as data. Users can also use the LAN to communicate with each other, by sending e-mail or
engaging in chat sessions.  

The following characteristics
differentiate one LAN from another:

* Topology

 The geometric arrangement of devices on the
network. For example, devices

can be arranged in a ring or in a
straight line.


 The rules and encoding specifications for
sending data. The protocols also determine

whether the network uses a
peer-to-peer or client/server architecture.


 Devices can be connected by twisted-pair wire,
coaxial cables, or fiber optic cables. Some networks do without connecting
media altogether, communicating instead via radio waves.

LANs are capable of transmitting
data at very fast rates, much faster than data can be transmitted over a telephone
line; but the distances are limited, and there is also a limit on the number of
computers that can be attached to a single LAN. 

2. Metropolitan Area Network (MAN) : — 

             Short for Metropolitan Area Network,
a data network designed for a town or city. In terms of
geographic breadth, MANs are larger
than local-area networks (LANs), but smaller than wide-area networks (WANs).
MANs are usually characterized by very high-speed connections using fiber
optical cable or other digital media. 

3. Wide Area Network ( WAN) :—-

A computer network that spans a
relatively large geographical area. Typically, a WAN consists of two or more
local-area networks (LANs).

Computers connected to a wide-area
network are often connected through public networks, such as the telephone
system. They can also be connected through leased lines or satellites. The
largest WAN in existence is the Internet.

The shape of a local-area network
(LAN) or other communications system. There are three principal 3 topologies
used in LANs.
· Bus topology
All devices are connected to a
central cable, called the bus or backbone. Bus networks
are relatively inexpensive and easy
to install for small networks. Ethernet systems use a bus topology.
· Ring topology
 All devices are connected to one another in
the shape of a closed loop, so that each
device is connected directly to two
other devices, one on either side of it. Ring topologies are relatively expensive
and difficult to install, but they offer high bandwidth and can span large
· Star topology
 All devices are connected to a central hub.
Star networks are relatively easy to install
and manage, but bottlenecks can
occur because all data must pass through the hub.
These topologies can also be mixed.
For example, a bus-star network consists of a high-bandwidth bus, called the
backbone, which connects a collection of slower-bandwidth star segments

Related Posts

Leave a Reply

Your email address will not be published. Required fields are marked *