In a more normal domain set-up, best practise means you have two domain controllers and DNS servers. In which case, the DC would have DNS settings of 127.0.0.1 (itself) and the IP of the other DNS server.
In a more normal domain set-up, best practise means you have two domain controllers and DNS servers. In which case, the DC would have DNS settings of 127.0.0.1 (itself) and the IP of the other DNS server.