_ldap._tcp.<SiteName>._sites.<DnsDomainName>.

Allows a client to find an LDAP server in the domain named by <DnsDomainName> and is in the site named by <SiteName>. For example, _ldap._tcp.redmond._sites.nt.microsoft.com. All Windows NT Domain controllers will register this name.

_ldap._tcp.dc._msdcs.<DnsDomainName>

Allows a client to find a DC of the domain named by <DnsDomainName>. All Windows NT Domain controllers will register this name.

_ldap._tcp.<SiteName>._sites.dc._msdcs.<DnsDomainName>

Allows a client to find a DC of the domain named by <DnsDomainName> and is in the site named by <SiteName>. All Windows NT Domain controllers will register this name.

_ldap._tcp.pdc._msdcs.<DnsDomainName>.

Allows a client to find the primary DC (PDC) of the domain named by <DnsDomainName>. Only the PDC of the domain registers this name. The PDC is responsible for deregistering any other registrations of this name.

_ldap._tcp.gc._msdcs.<DnsForestName>.

Allows a client to find a Global Catalog (GC) server for this domain. Only a DC serving the GC of the forest named by <DnsForestName> registers this name. For example, _ldap._tcp.gc._msdcs.microsoft.com.

_ldap._tcp.<SiteName>._sites.gc._msdcs.<DnsForestName>.

Allows a client to find a Global Catalog (GC) server for this domain and is in the site named by <SiteName>. Only a DC serving the GC of the forest named by <DnsForestName> registers this name. For example, _ldap._tcp.redmond._sites.gc._msdcs.microsoft.com.

_gc._tcp.<DnsForestName>.

Allows a client to find a Global Catalog (GC) server for this domain. Only an LDAP server serving the GC of the forest named by <DnsForestName> registers this name. For example, _gc._tcp.microsoft.com. The LDAP server is not necessarily a DC.

_gc._tcp.<SiteName>._sites.<DnsForestName>.

Allows a client to find a Global Catalog (GC) server for this domain and is in the site named by <SiteName>. Only an LDAP server serving the GC of the forest named by <DnsForestName> registers this name. For example, _gc._tcp.redmond._sites.microsoft.com. The LDAP server is not necessarily a DC.

_ldap._tcp.<DomainGuid>.domains._msdcs.<DnsForestName>. Allows a client to find a DC in a domain with a GUID of <DomainGuid>. This operation will only be done if the <DnsDomainName> of the domain has changed and the <DnsForestName> is known. This operation is expected to be infrequent. This operation will only function if the Dns Forest Name has not also been renamed. For example, _ldap._tcp.4f904480-7c78-11cf-b057- 00aa006b4f8f.domains._msdcs.microsoft.com. All Windows NT Domain controllers will register this name.

_kerberos._tcp.<DnsDomainName>

Allows a client to locate a Kerberos Key Distribution Center (KDC) for the domain.

Windows 2000 White Paper

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Microsoft windows 2000 DNS manual Ldap.tcp.dc.msdcs.DnsDomainName