And if someone connects their laptops, how would I find out which network drop and switch port they are connecting from.
Is there a way that I can differentiate the systems in my network and other outside laptops (apart from MAC address).
Again, depending on the nature of your switch, you should be able to tell which device potentially failed an authentication and then either kick them off the network or put them on a quarantined VLAN, depending on what your policy is.
MAC address is certainly one way to tell a "known" device vs. an unknown device, but I'm not partial to any technique. Depending on which NAC and/or LAN security solution chosen, you'll be able to distinguish between stuff you know and stuff you don't.
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