An internal root zone is generally used when an organization requires an internal DNS name space to support a very large intranet. The root zone delegates domains to top-level and lower level domains.
Root zones are always created at the view level. This way, you can create a configuration that has a root zone in the internal view, and an external view that uses the Internet root servers.
When you are using internal root servers, the Root zone section in the expanded details section for the view displays the internal root server being used.
To create an internal root zone for a view: