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It is a collection of computers and devices connected by communications channels that facilitate communication and sharing of resources among users. Networks may be classified as:
Joins a set of attachment units together of point-to-point connections between each unit Each attachment unit, in turn, interfaces to one or more computers or computing devices Information flows between attachment units in a single direction, thus forming a ring network Appropriate only in small networks
Each computer is connected on a point to-point link to a central device called a Hub. The hub acts as the LAN traffic manager, setting up communication paths between two devices seeking to exchange information.
A set of computers or devices connected to a common, linear connection Information is transmitted over the distance of the network Each computer can pick up its intended information Links from the main bus line might break off into additional linear links with multiple attachments