What are components of data communication ? protocol & Transmission medium&...

 What are components of data communication ?

A data communications system has five components :

 1__Message:
What is Message ?
The message is the information (data) to be communicated.
 Popular forms of information include text, numbers, pictures, audio, and video. 

2__Sender:
What is sender ?
 The sender is the device that sends the data message.
 It can be a computer, workstation, telephone handset, video camera, and so on .

3__Receiver:
What is Receiver ?
The receiver is the device that receives the message.
 It can be a computer, workstation, telephone handset, television, and so on.

4__Transmission medium:
What is Transmission medium ?
The transmission medium is the physical path by which a message travels from sender to receiver.

 Some examples of transmission media include :
What are transmission media :
 twisted-pair wire
 coaxial cable
 fiber-optic cable
and radio waves.

5__Protocol :
What is protocol ?
A protocol is a set of rules that govern data communications. 
It represents an agreement between the communicating devices. 
Without a protocol, two devices may be connected but not communicating.

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