Console security

Machines and consoles need to be secure. A person can simply turn off a computer if one has access to it. If they have access to the console, they can often interrupt the boot process to get access to the root prompt. If this doesn't work, they can keep guessing the root password in hopes of compromising the system.

For these reasons (and more), the computers and associated consoles should be kept in a secure room. A limited number of people should have access to this room, of course with a limited number of keys. Some places actually have security guards let people into the computer rooms for guaranteed secure access.

If your data is sensitive, be certain to verify that there are no alternative methods for getting into the room. This includes hidden spare keys in an unsecured place, gaps in the raised floors that go past the locked access point, and space above the ceilings.