Microsoft was slow to accept TCP/IP as a networking standard until realization that the Internet was here to stay, and it was IP based. When Microsoft introduced the concept of NT domains as a CIFS authentication system, they ended up confusing a lot of network administrators. A Microsoft Windows NT Domain had nothing to do with DNS. A Windows server configured as a PDC (Primary Domain Controller) had nothing to do with hosting Internet domain names. This might seem simplistic to those that understand NetBIOS and DNS, but even they would be surprised how many Microsoft Certified technicians were completely confused about what an NT Domain had to do with DNS. DNS was not even necessary when setting up a Microsoft Windows network with an NT Domain. Now that Active Directory has succeeded NT Domain networks, DNS has gone from being the confusing “domain” thing to a critical part of the Windows network.