This policy setting specifies the sites for which the domain controllers (DC) that host the application directory partition should register the site-specific application directory partition-specific DC Locator DNS SRV resource records. These records are registered in addition to the site-specific SRV records registered for the site where the DC resides and records registered by a DC configured to register DC Locator DNS SRV records for those sites without a DC that are closest to it. The application directory partition DC Locator DNS records and the site-specific SRV records are dynamically registered by the Net Logon service and they are used to locate the application directory partition-specific DC. An Active Directory site is one or more well-connected TCP/IP subnets that allow administrators to configure Active Directory access and replication. To specify the sites covered by the DC Locator application directory partition-specific DNS SRV records click Enabled and then enter the site names in a space-delimited format. If you do not configure this policy setting it is not applied to any DCs and DCs use their local configuration.