[CentOS] DNF update

Wed Sep 7 00:57:07 UTC 2016
Jerry Geis <geisj at pagestation.com>

I was searching tonight how to update OLD systems.
I have C5 and C6 systems that need updating and they are remote systems.

I followed the paths and ended up at DNF.

Is this a valid option for updating C5 and C6 to take them to C7?