the message is the information (data) to be communicated consist of text, number, sound or video
The Sender sends a Message over the Medium to the Receiver.
Eg. Workstataion ,PC , tel. Handset, or video camera
The receiver is the device that receive the data or message
The medium for communication is very important because without the medium there cannot be any communication, and further, the nature of the medium determines the speed of communications.
Protocol set of rules that govern data communication
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