⟩ How will you remove Orphaned Domains from Active Directory?
Typically, when the last DC for a domain is demoted, the administrator selects this server is the last DC in the domain option in the DC Promo tool, which removes the domain metadata from Active Directory.
1) Determine the DC that holds the Domain Naming Master FSMO role.
2) Verify that all servers for the specified domain have been demoted.
3) At the command prompt:
★ ntdsutil
★ metadata cleanup
★ connections
★ connect to server servername