Physical Security
The most secure operating system and network in the world is of only limited use if a hacker (or disgruntled employee) can walk up to your server and access it physically. With physical access to a computer, there are a lot of things an unethical person can do—from simply turning the system off, to booting from a floppy disk and wiping the hard drive clean (or stealing data), to actually making off with the hardware.
The absolute first requirement of computer security is physical security. At a minimum, take the following precautions. Also, evaluate your own environment and security requirements to determine what additional steps, such as biometric or smart card controls, might be appropriate.
Place servers in a locked server ...
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