What occurs if a primary domain is not set with a parent?

When a primary domain is not set with a parent, it operates independently. In a hierarchical domain structure, a primary domain can function without a parent, meaning it has the ability to exist and manage its own resources, users, and policies without being linked to another domain. This independence allows the primary domain to perform its necessary functions, although it may have limitations compared to domains that are part of a larger parent-child hierarchy.

The independence of a primary domain can be beneficial in scenarios where organizations require a standalone structure or wish to avoid complexities associated with managing relationships between multiple domains. However, this independence might also mean that certain benefits of having a parent domain, such as centralized management, shared resources, and streamlined policies, are not accessible.