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.