I was under the impression that, while a switch is often termed a multiport
bridge, there is one fundamental difference in the way the two devices
forward frames.  While my source is not always the most credible or reliable
(Course Technology Networks Plus book), it does cause me to stop and think
for a minute.  Anyway, the difference (as described in the book) is as
follows:

If a multiport bridge determines (based on the destination MAC address) that
the destination node is on another subnet, it will broadcast the frame out
all ports except the originating port.  A switch, on the other hand, is
smart enough to only forward the frame out the destination port.  Both
devices handle unknown frames and broadcasts the same way, ie. they will
forward the packets out all ports except the one the frame was received on.

Any thoughts?




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