BASIC NETWORK CONCEPTS
Networks are an interconnection of computers. These computers can be linked together
using a wide variety of different cabling types, and for a wide variety of
different purposes.
The basic reasons why computers are networked are

It would not be necessary for users to transfer files via electronic mail or floppy disk, rather, each user could access all the information they require, thus leading to less wasted time and hence greater productivity.
Imagine the benefits of a user being able to directly fax the Word document they are working on, rather than print it out, then feed it into the fax machine, dial the number etc.
Small networks are often called Local Area Networks [LAN]. A LAN is a network allowing easy access to other computers or peripherals. The typical characteristics of a LAN are,