Service (SRV) Records
Service (SRV) records are RRs that indicate which resources perform a particular service. Domain controllers in AD DS are referenced by SRV records that define specific services, such as the Global Catalog (GC), Lightweight Directory Access Protocol (LDAP), and Kerberos. SRV records are a relatively new addition to DNS, and did not exist in the original implementation of the standard. Each SRV record contains information about a particular functionality that a resource provides. For example, an LDAP server can add an SRV record, indicating that it can handle LDAP requests for a particular zone. SRV records can be very useful for AD DS because domain controllers can advertise that they handle Global Catalog requests, as illustrated ...
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