Ethernet LAN MAC layer for a switch and a router

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Subject Author Date
MAC layer for a switch and a router Michelot 11-30-07
Posted by Michelot on November 30, 2007, 4:25 am
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Bonjour,

I am thinking a curious thing I had never considered before, or simply
forgot.

(1) A basic hub has no MAC layer, so it can look at Ethernet
addresses.

(2) A basic switch is a layer 2 interconnection device, so it can
consider Ethernet addresses.

(3) A basic router is a layer 3 interconnection device. It has a MAC
layer like a switch but, besides, each port has it own Ethernet
address.

What would be the difference between a "switch MAC layer" and a
"router MAC layer" that makes in one case we don't have an Ehernet
address and in the other case we have an Ethernet address? Perhaps the
MAC layer can be divided in several sublayers.

Thanks for your advice,
Michelot

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