> Another case for a business would be port security. If I try to move a computer > around my office at work, the computer and the port would be instantly knocked off of > the network. I'm fairly certain that it's MAC based...
That's an entirely different case. On a wired network you can't sniff the allowed MAC for a given port off the air, and they can lock out the port immediately on seeing an unauthorised MAC address so you can't try addresses until it works.
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