Ok, this is most probably a noob question.
My company (A.com), has a DNS zone in a linux server with records pointing to different web pages, example: radio.a.com, www.a.com, webmail.a.com, etc..
For a specific service, I need an Active directory domain called: daas.A.com
Thing is, I don't have an AD domain A.com in place. So my question is:
Do I need to create an AD domain for A.com before creating the one that I need?
If I don't, and I just create the daas.A.com as a new forest, will I be able to add an A.com domain in the future as parent?
As per DNS records in the linux box, I guess I would only need a NS pointing to the DNS of the new domain, and an A record resolving that to an IP. or Something like that..
Thanks!