Tool that notify when a new device is plugged into a network

Hi everybody,
Recently i had the following situation:
Someone connect a new PC into my LAN with DHCP service active so PC`s of my
network sometimes obtain IP addresses out of our scope.
We have Traffic Analyzers, etc but i am searching for any tool that will be
capable of notify or warning when a new device is plugged into a network
Do you know one ?

Thanks a lot,
Nico.

.

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