Windows Server 2008 DNS Active Directory Records

If you turned on dynamic updates in the previous sidebar, and you have Active Directory loaded on your server, reboot your system. After your system reboots, notice the following new records in your zone.

• _ldap._tcp. Enables a client to locate a domain controller in the domain named by . A client searching for a domain controller in the domain uccentral.ads would query the DNS server for _ldap._uccentral.ads.

• _ldap._tcp.._sites. Enables a client to find a domain controller in the domain and site specified (such as _ldap._tcp.lab._sites.uccentral.ads for a domain controller in the Lab site of uccentral.ads).

• _ldap._tcp.pdc._msdcs. Enables a client to find the PDC Emulator flexible single master operations (FSMO) role holder of a mixed- or native-mode domain. Only the PDC of the domain registers this record.

• _ldap._tcp.gc._msdcs. Found in the zone associated with the root domain of the forest, this enables a client to find a Global Catalog (GC) server. Only domain controllers serving as GC servers for the forest will register this name. If a server ceases to be a GC server, the server will deregister the record.

• _ldap._tcp. ._sites.gc._msdcs. Enables a client to find a GC server in the specified site (such as _ldap._tcp.lab._sites.gc._msdcs. uccentral.ads).

• _ldap._tcp..domains._msdcs. Enables a client to find a domain controller in a domain based on the domain controller’s globally unique ID (GUID). A GUID is a 128-bit (8 byte) number that is generated automatically for the purpose of referencing Active Directory objects. This mechanism and these records are used by domain controllers to locate other domain controllers when they need to replicate, for example.

Enables a client to find a domain controller via a normal Host (A) record.

Special records specifically associated with Active Directory allow servers and clients to interact with Active Directory services in a meaningful way.

Source of Information : Syngress The Best Damn Windows Server 2008 Book Period 2nd Edition

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