There are two sites - both are in the same domain.
There are two domain controllers in site A - only one in site B.
The one DC in Site B has a corrupt AD database and is no longer syncing with Site A.
I will replace it with a new DC and plan to demote the old DC and then promote the new one.
I am worried about what could happen if there are any problems promoting the new DC.
With the old DC demoted at that point, would users in B still be able to log in using the DC's at Site A?
Is there something I can check first to confirm if user logins will work even with no DC on that site?