mcavic - 3:11 pm on May 29, 2009 (gmt 0)

Each subnet will run only at the highest speed supported by all attached devices.

I don't buy that at all. Why, then, would anyone make a switch that has both 100mbit and gigabit ports? The whole point of a switch is to allow device A and device B to talk at one speed, and device C and device D to talk at another speed.

What if you plugged a 10mbit device (like a modem or router) into a 100mbit switch? It certainly won't slow the network to 10mbit.