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Are subdomains necessary in an internal AD/DNS structure?

In designing an internal AD/DNS structure, are subdomains an over-complication or still a valid consideration given a multi-platform (though mostly Windows) environment?
For Active Directory a DNS subdomain would generally represent a child domain in an Active Directory tree or forest. Creating additional AD domains in your Active Directory infrastructure should not be done lightly, as they will require additional hardware and more management. As a general organizational tool, subdomains can be useful. However, I usually see them as ill-planned and they often suddenly become outdated when corporate organizational changes occur. Use them, but use them sparingly with consideration that changes can and will occur.

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