Networking notes

A computer network allows  one computer to share/ exchange data with another computer.
or when a computer is able to share and exchange data with another computer they are said to be in a network.
Internet: Network of networks is called internet.
Intranet : It a network of networks among computers of same organization.
Extranet : Network of networks of some organisations.

Types of Network

PAN : Personal Area Network
This type of network if confnied within a metre or two.

LAN : Local Area Network
Area of network confined within 1-2 kilometers is  called an LAN

MAN :  Meropolitan Area Network
WAN :  Wide Area Network

Topology : The pattern of arrangement of computers/ nodes in a network is called the topology.