CH 4 Half and Full Duplex

Full-duplex communication

Both devices can transmit and receive on the media at the same time.

Half-duplex communication

Both devices can transmit and receive on the media but cannot do so simultaneously. allows only one device to send or receive at a time on the shared medium

full-duplex

allows the sending and receiving of data to happen simultaneously.

Ethernet switches operate in

full-duplex mode by default, but can operate in half-duplex if connecting to a device such as an Ethernet hub.

The half-duplex mode is used in

legacy bus topologies and with Ethernet hubs and is used with contention-based access methods.

WLANs

operate in half-duplex.

Half-duplex communications

restrict the exchange of data to one direction at a time

The data link layer with full-duplex assumes

that the media is available for transmission for both nodes at any time.

Duplex communications refer to

the direction of data transmission between two devices.