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Agreement between communication devices are called ________

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Agreement between communication devices are called ________

(a) Transmission medium

(b) Channel

(c) Protocol

(d) Modem

I have been asked this question in an online interview.

Question is from Channel in section Elements of Communication System of Analog Communications

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The correct answer is (c) Protocol

For explanation I would say: Protocol is a set of rules that looks after data communication, by acting as an agreement between communication devices. Channel is the transmission medium or the path through which information travels. Modem is a device that modulates and demodulates data.

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