There comes a time when you may be required to integrate a more complex DNS infrastructure other than a policy of “all requests come here and then go out to the web” for resolution.
Lets say, you work at Company X which operates a Windows DNS infrastructure of “domain.com”. Changes are you run a very similar principle to the above. Perhaps your DNS servers are your Active Directory Domain Controllers and when they are unable to resolve an address of something.domain.com, it simply forwards the DNS query out into the ether (perhaps this might go to your ISP or even direct to the root DNS servers around the world).
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