Your third task is to set up a forwarder to handle all other DNS requests. This DNS server would be an external DNS server, such as the one that your Internet provider supplied. So, for example, if your ISP provides DNS server IP addresses of 192.14.9.22 and 192.15.9.23, you would use the command
dnscmd /resetforwarders 192.14.9.22 192.15.9.23
If you maintain a tight firewall policy, you might not want your resolvers to be able to perform recursive lookups on their own. If you prefer that your resolvers contact only your external DNS servers, add the /slave parameter to the previous command.
To test the setup, set the DNS servers on your network adaptor to those you used for your resolvers. Then, use Nslookup to search for several local and public host names.
Good Plan
If you follow this article's DNS server plan, you'll find that your DNS infrastructure will perform more efficiently and securely, and you'll experience more uptime. And you'll be capable of scaling to just about any size your organization requires.