Full/Half Duplex

Half Duplex

The device cannot send and receive data at the same time. If it is receiving a frame, it must wait before sending a frame.

It was used in devices like Hubs.

Devices attached to a hub must operate in half duplex.

Full Duplex

The device can send and receive data at the same time. It does not have to wait.

Devices attached to a switch can operate in full duplex.