Barney and Fred Sending and Receiving at the Same TimeFull Duplex

This section started by making an analogy that a hub was like a one-lane road, and that you had to wait until the other car passed before you could use the road. With switches and full duplex enabled, the LAN works like you have a two-lane road between the switch and each device, plus another two-lane road between each port on the switch. The switch plays traffic cop, preventing collisions simply by buffering frames. Figure 6-8 illustrates the basic idea.