Wrong, wrong, wrong.
It can be hard to admit that.We’re naming the fully qualified domain name (FQDN) of an Active Directory domain either a valid name, or using .local TLD and these are both incorrect. Recently, when I was again tasked to build a small (200-ish user) Active Directory domain from scratch, I was again confronted about how wrong those of us in this industry have been. What’s even worse is that Microsoft has been recommending the “Right” way for 14 years!