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DHCP lease issue ?

Last Modified: 2016-05-10

I have noticed that when clients come to our office and when they use our WIFI or if they use our Ethernet connection I can see theirs Laptops on my DHCP lease and also on network mapping. Could you tell me how to block it  and why is it happening ? they are not in my Domain so how can I see theirs laptops on my server and network?

Is there any way to put Security rules for DHCP ?

thank you for help
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