Cisco dns server, Active Directory. How to register a link to the AD server in Cisco?

Question

Domain Name System

Good day, I don’t know much about the intricacies of the question, if the answer is more detailed, thank you very much right away !!! or your suggestions on the matter.
There is a fairly large enterprise network and a small number of PCs, the time has come to make a domain controller (WS2008R2 is installed on a virtual machine). Based on materials found on the Internet, dns server is used everywhere on the same machine on which AD is installed. In all subnets, Cisco 2900 is specified as DNS, looking outward, as I understand it, it simply caches.
Question: Is it possible to use this Cisco as a DNS server, what is the best way to register a link to the AD server? or is it better to change (in the Cisco configs) the DNS server to the one that will stand with AD, and already from this server, forwared further?

Answer 1

Two options:

• On clients, leave DNS pointing to Cisco, and on it specify forward to AD DNS with the command ip name server %ip address DNS%
  
• Specify AD DNS on clients, because your settings are distributed via DHCP?
  

Answer 2

The second option - let AD go to a cisco, or directly to provider addresses, and client machines to AD