What DNS record type is used to locate Directory Services (LDAP) servers?

• A. Web Hosting
• B. Directory Services (LDAP)
• C. Email Routing
• D. File Transfer

Answer: (B)

Locating a directory service like LDAP through DNS relies on service records that publish where the LDAP service can be reached. The key mechanism is SRV records, which specify the service type (_ldap), the protocol (usually TCP), and the host and port of the LDAP server. This enables clients to discover LDAP servers dynamically for a domain, such as finding domain controllers that provide LDAP as part of directory services.

In the context of the options, the presence of Directory Services (LDAP) reflects the LDAP service being located via DNS discovery. The other options point to different kinds of DNS usage (web hosting for HTTP, email routing via mail exchange, file transfer), which are not about locating LDAP servers.