-One of the Attorney's in my office went out of state (off the local network) for a few days.
-He changed his computer's name while off the local network.
-Now that he's back in the office I am still able to ping his old computer name.
-His old computer name's IP is the same as another computer in the office.
Why would it be doing this? I can still ping his old computer name somehow and it is sharing the same IP as another computer in the office. How do I make it so that it doesn't show his old computer name on the network anymore.