Computer Network
Two Computers are said to be interconnected if they interchange information.The Connection between the separate computers can be done via a copper wire,fiber optics,microwaves or communication satellite.
A System with one control unit and many slaves,or a large computer with remote printers and terminals is not a computer network,It is called a distributed system.
Network is a broad term which is very much similar to system.Network is a communication system which supports many users. We can say that a Computer network is a system which allows communication among the computers connected in the network.
The most important of them are:-
1. Performance, 2. Reliability, 3. Security.
Performance: Performance can be measured in many ways. We can measure it in terms
of transit time and response time.
(a) Transit Time: It is defined as the amount of time required for a message to travel from one device to the other.
(b) Response Time: It is the time elapsed between enquiry and response.
Reliability: The network reliability is important because it decides the frequency at which network failure takes place.
Security: The network security refers to protection of data from the unauthorized user or access.
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