|Securing and Optimizing Linux: RedHat Edition -A Hands on Guide|
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It is recommended that you set a Boot password to disallow booting from floppy drives and set passwords on BIOS features. You can check your BIOS manual or look it over thoroughly the next time you boot up your system to know how to do this. Disallowing the possibility to boot from floppy drives and being able to set a password to access the BIOS features will improve the security of your system. This will block undesired people from trying to boot your Linux system with a special boot disk and will protect you from people trying to change BIOS feature like allowing boot from floppy drive or booting the server without prompt password.