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MCSE : Security Specialist So now you understand that Windows 2000 domains rely heavily on DNS entries. If you enable dynamic update on the relevant DNS zones, W2K creates these entries automatically: _ldap._tcp.<DNSDomainName> Enables a client to locate a W2K domain controller in the domain named by <DNSDomainName>. A client searching for a domain controller in the domain dpetri.net would query the DNS server for _ldap._tcp.dpetri.net. _ldap._tcp.<SiteName>._sites.<DNSDomainName> Enables a client to find a W2K domain controller in the domain and site specified (e.g., _ldap._tcp.lab._sites.dpetri.net for a domain controller in the Lab site of dpetri.net). _ldap._tcp.pdc._ms-dcs.<DNSDomainName> Enables a client to find the PDC flexible single master object (FSMO) role holder of a mixed-mode domain. Only the PDC of the domain registers this record. _ldap._tcp.gc._msdcs.<DNSTreeName> Enables a client to find a Global Catalog (GC) server. Only domain controllers serving as GC servers for the tree will register this name. If a server ceases to be a GC server, the server will deregister the record. _ldap._tcp. ._sites.gc._msdcs.<DNSTreeName> Enables a client to find a GC server in the specified site (e.g., _ldap._tcp.lab._sites.gc._msdcs.dpetri.net). _ldap._tcp.<DomainGuid>.domains._msdcs.<DNSTreeName> Enables a client to find a domain controller in a domain based on the domain controller’s globally unique ID. A GUID is a 128-bit (8 byte) number that generates automatically for referencing Active Directory objects. <DNSDomainName> Enables a client to find a domain controller through a normal Host record. After running DCPROMO, A text file containing the appropriate DNS resource records for the domain controller is created. The file called Netlogon.dns is created in the %systemroot%\System32\config folder and contains all the records needed to register the resource records of the domain controller. Netlogon.dns is used by the Windows 2000 NetLogon service and to support Active Directory for non-Windows 2000 DNS servers. If you are using a DNS server that supports the SRV resource record but does not support dynamic updates (such as a UNIX-based DNS server or a Windows NT Server 4.0 DNS server), you can import the records in Netlogon.dns into the appropriate primary zone file to manually configure the primary zone on that server to support Active Directory.