Somewhere I used to work the wired network was set up to block anything with a non-whitelisted MAC address and the firewall to the outside wall required your payroll number as the user name. From time to time we'd have external people come in, unplug somebody's desktop to plug their laptop in and complain "the network's down"
= How do I get a connection?
# Plug in a $CORP-owned computer into the $CORP network and log on with your $CORP payroll number and password.
= Oh, but this is my laptop, can I use your desktop?
# Yes ok here, log on with your payroll number and password.
= But I don't work for you, can you log on for me?
# Please leave my office.