Today the world scenario is changing. Data Communication and network have changed the way business and other daily affair works. Now, they rely on computer networks and internetwork. A set of devices often mentioned as nodes connected by media link is called a Network. A node can be a device which is capable of sending or receiving data generated by other nodes on the network like a computer, printer etc.
These links connecting the devices are called Communication channels. A network is a collection of computers and communications hardware and software linked together to allow sharing of resources and provide a facility for communication.
A well Detailed Textbook on Computer Networks
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