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Actually...
The purpose of a Mac address isn't so that all ethernet cards can be positively identified. Mac addresses are different so that communication over the IP layer is possible. Mac addresses can be the same (though, unless you are manually changing them, this will never happen) they just can't be the same on the same LAN.
Re:Actually...
You seem to have misunderstood what I meant. I meant that a MAC address is supposed to be unique, so that even if you created a LAN containing every network card in the universe, they would all have a different MAC address, and therefore be individually distinguishable. If two had the same MAC address, the messages destined for either of them would be received by both, and messages from either of them would appear to be coming from a single card. This is why each and every network card manufactured has a MAC address hard-coded into it. |
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