Figure 2-22 shows how full-duplex can be implemented for bidirectional communication
on a switch where it connects to a host but this feature cannot be con?¬?gured for connectivity
for a hub.
Figure 2-22 Full- and Half-Duplex Connections
Standard shared Ethernet con?¬?guration ef?¬?ciency is typically rated at 50 to 60 percent of
the 10-Mbps bandwidth. Full-duplex Ethernet offers 100 percent ef?¬?ciency in both
directions (10-Mbps transmit and 10-Mbps receive).
Switch
Hub
Maximizing the Benefits of Switching 185
Full-Duplex Communication
Because each device on a microsegmented switched LAN is connected directly to a port on
a switch, the switch port and that device have a point-to-point connection. In networks with
hubs instead of switches, devices can communicate in only one direction at a time because
they must compete for the network bandwidth. This type of communication is referred to
as half-duplex communication, because it allows data to be either sent or received at one
time, but not both. Microsegmented switch ports, however, can provide the devices
connected to them with full-duplex-mode communication, allowing the devices to both
send and receive data simultaneously. This ability effectively doubles the amount of
bandwidth between the devices.
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