I have a 2008R2 domain controller (running dns) I want to install an additional domain controller but am unsure how DNS should be setup. On the second server should I point my dns to the main domain controller then run dcpromo adding dns though the wizard. Once the wizard is finished then I change the DNS back to point to itself seeing as the role along with the active directory services should be installed and propagated from the main DC at that point.
Also before adding the second domain controller do I need to run domain or forest prep on the main domain controller as I saw this suggestion in a few posts. I'm not sure why this would be done.