To create alternative UPN suffixes, which group must the administrator belong to?

To create alternative User Principal Name (UPN) suffixes in a Windows domain environment, the administrator must be a member of the Enterprise Admins group. This is due to the elevated privileges associated with the Enterprise Admins role, which has the necessary rights to manage and modify forest-wide settings, including UPN suffixes.

UPN suffixes are significant in large environments where there may be multiple domains within a forest, and they allow for more flexibility in naming conventions. By adding alternative UPN suffixes, users can log in with alternative domain names, improving usability and organization.

Being part of the Enterprise Admins group means the administrator has permissions over the entire Active Directory forest, not just a single domain, which is crucial for changes that affect the overall structure and naming conventions of user accounts across multiple domains.

In contrast, the Domain Admins group typically has administrative rights limited to a specific domain, while Schema Admins hold rights to modify the schema (the structure of the Active Directory database). Network Admins, while essential for maintaining network infrastructure, do not have the specific permissions needed to create or modify UPN suffixes in the Active Directory.