The smbpasswd command changes passwords stored on which type of controllers?

The smbpasswd command is specifically designed to manage user accounts and passwords for Samba, which is a free software re-implementation of the SMB/CIFS networking protocol that allows file and print sharing between computers. Since Samba can function as a domain controller in a network environment, the smbpasswd command operates exclusively within the context of Samba domain controllers.

When you use smbpasswd, it directly interacts with the Samba’s internal database to update the user passwords. This makes it applicable only to environments where Samba is serving as the domain controller, rather than traditional Linux or Windows domain controllers that do not utilize Samba's password management mechanism in the same way.

Thus, the correct answer emphasizes that the functionality of the smbpasswd command is limited to Samba domain controllers, distinguishing it from password management commands used in other types of domain controllers, which do not utilize Samba's infrastructure.