What is mean by data communication?
Data communication is the exchange of data (in the form of 1s and 0s) between two devices via some form of transmission medium (such as a wire cable). 2. What are the three criteria necessary for an effective and efficient network? The most important criteria are performance, reliability and security. Performance of the network depends on number of users, type of transmission medium, the capabilities of the connected h/w and the efficiency of the s/w. Reliability is measured by frequency of failure, the time it takes a link to recover from the failure and the network’s robustness in a catastrophe. Security issues include protecting data from unauthorized access and viruses. 3. What are the three fundamental characteristics determine the effectiveness ofthe data communication system? The effectiveness of the data communication system depends on three fundamental characteristics: Delivery: The system must deliver data to the correct destination. Accuracy: The system must deliver data acc
