Linux distro used for CompTIA Linux+?

Which Linux distributions is the CompTIA Linux+ based on? I've heard RedHat and SUSE?

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RedHat/CentOS, Debian/Ubuntu, and (open)SUSE.
It focuses slightly more on RedHat, then Debian, and last SUSE.

If you don't have access to RHEL then do CentOS and I would recommend Xubuntu. That's for getting away from the unity interface.

CentOS and Ubuntu is what I used to prepare.