Directory servers from different vendors are synchronized through ________.

• A. None of the above
• B. LDAP
• C. central authentication servers
• D. AD servers

Answer: (A)

Synchronizing directory data across different vendors requires a bridging mechanism that can map schemas and propagate changes between distinct directory implementations. LDAP is a protocol for querying and updating a single directory server; it does not by itself replicate or synchronize data across multiple directories with potentially different schemas. Central authentication servers describe a role, not a cross-vendor sync method, and Active Directory servers are a specific vendor’s product, not a universal synchronization solution. Because none of the listed options describe a universal cross-vendor synchronization method, this question points to none of the above. In practice, you’d use an identity-management or directory-integration tool (or data interchange formats like LDIF, or standards such as SCIM) to keep directories in sync across vendors.