Answer:
The communications device can transmit and receive at the same time.
It carries the configuration information between each end of a data link.
Step-by-step explanation:
Full duplex is a mode of communication between two ports connected by a single link. It allows for transmitting and receiving of data at the same time on a single data-link.
When full duplex is configured on one port and half duplex, on another, it gives an mismatch error and communication is disallowed. So both ports on a single data-link must be configured with the communication mode like full duplex for compatible and fast transmission.