When the communication allows simultaneous talking and listening by two parties over the same channel, it is called ______.

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Question

This question was previously asked in

RRB ALP Mechanic Radio & TV 23 Jan 2019 Official Paper (Shift 3)

Answer 1

Full duplex:

The two parties will communicate with each other simultaneously in a full-duplex device.
A telephone is an example of a complete duplex device; the parties at both ends of a call will communicate and be heard simultaneously by the other party.
Communication in those devices is in one direction only.
For example, a telephone is a full-duplex device because both parties can talk at once. In contrast, a walkie-talkie is a half-duplex device because only one party can transmit at a time.