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How can I stop valid users with home laptops from acquiring a netconnection

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Charles Bundy

If you have access to DHCP lock it down by MAC. Likewise DNS. Do you have physical access to rack? If so make certain that nothing has a patch cord if it terminates to an open wallplate jack.

I will say at the end of the day anyone who is clever and has physical access can bypass things by simply swaping out a hot seat with their MAC spoofing laptop. This is regardless of what you control including the switch infrastructure. Thus it requires management backing and may not be a technical problem, if you catch my drift...