A lot of the information provided here was gathered from http://systemcenterforum.org/wp-content/uploads/ADIntegration_final.pdf
The Microsoft Active Directory database is split into different stores or partitions. Microsoft Active Directory often refers to these partitions as 'naming contexts'.
The Schema Directory Partition and Configuration Directory Partition replicate to all Domain Controllers in the AD Forest.
The Domain Directory Partition replicates only to Domain Controllers within its domain. A subset of objects in the domain partition are also replicated to Domain Controllers that are configured as Global Catalogs.
When we look at our domain, we see the following NamingContext values:
(nETBIOSName=*)
The base for the search should be at the root of the domain. (ie dc=mad,dc=willeke,dc=com) unless noted otherwise.
This is one of several LDAP Query Examples.