Examining DNS Namespace Concepts
A DNS namespace, simply defined, is the bounded logical area formed by a DNS name and its subdomains. For example, europe.companyabc.com, asia.companyabc.com, and companyabc.com are all part of the same contiguous DNS namespace. A DNS namespace in AD DS can be published on the Internet, such as microsoft.com or cco.com, or it can be hidden from public exposure, depending on the strategy and security needs of its implementers.
• External (published) namespaces—A DNS name that can be resolved from anywhere on the Internet is known as a published or external namespace. This type of namespace was previously common for organizations that wanted the full convenience of having their commonly used Internet domain name ...
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