> The default gateway router of that subnet could simply deem the first
> accessed host (IP_x, MAC_y) as legal while the second host (IP_x, MAC_z) as
> illegal. Thus the malicious host could not grab the IP address which has
> been used by the legal host. 


802.1x prevents this.

> Similarly, the switch could simply deem the first accessed host with MAC_y
> is legal and the second host with the same MAC is illegal.


And this.

Tony

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