ADVANCED QUESTION !! Try This
 

Hi

I was always wondering about this Question.

In Windows when your on a network and someone else comes on the network with the same IP as yours, you get a message telling you about the IP Confict and then windows kicks you both off the network.

My Question is: What does linux do?

This almost certainly won't happen on dhcp setup so that means you are trying to put that address in manually.
It pops up a little error message on the newest arrival and refuses to accept that number on the new machine. No harm done to the first box at all.