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An example of a separate domain design is one where your organization registers the following external domain with an Internet name authority: example.com.
An example of a same domain design is one where your organization registers example.com as an external domain with an Internet name authority. Your organization also uses example.com as the name of the internal domain.
Two DNS zones represent the single domain; one DNS zone in the internal name server and one DNS zone in the external name server.
In the same domain, not split-brain design, internal and external hosts are served by one set of name servers and can access the same DNS information.
This design is not common because it exposes more information about the internal network to potential attackers.