A Network is the set of devices connected by communication links..A node can be a computer,printer,or any other device capable of sending and/or receiving data generated by other nodes on the network.Most network used distributed processing in which a task is divided among multiple computers instead of single.
The most important criteria for a good networks are
1) performance
2) Reliability
3) Security
In network the computer can be connected using four different type of topologies and the type of connection may be point-to-point or multipoint
