Which mechanism is used by Samba to permit identity resolution within a domain?

Samba utilizes the Name Service Switch (NSS) mechanism to resolve identities within a domain. NSS acts as a framework that allows the system to obtain user and group information from various sources such as local files, LDAP, or NIS. By leveraging NSS, Samba can seamlessly integrate with different identity sources to identify users and groups, allowing for effective authentication and authorization in mixed environments where Linux and Windows domains interact.

Using NSS in conjunction with Samba provides flexibility in how identity data is managed and resolved, enabling easier collaboration between systems in a domain. This is particularly important in heterogeneous environments where consistent identity resolution is crucial for services that rely on user permissions and access controls.

The other options, while relevant to various aspects of system operations, do not directly serve the purpose of identity resolution in the context of Samba and domain interactions.