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That way you can put MAC address security on the switch ports. If someone connects to a switchport their MAC address isn't supposed to be there, the port is turned off until you turn it back on.

With this setup, you know who is supposed to be on that switchport and if another computer connects to it, their connectivity will be turned off. Then they have to come to you and tell you they can't connect. Then you know by the security logs on the switch that someone disconnected their computer and plugged in another. You can then get the message out via the employees that they can't swap around NICs or computers or you'll know.