!!! Overview
[{$pagename}] ([DIT]), refers to the [hierarchical] structure (or [Directory Information Tree Structure]) of the [entries|LDAP Entry] in the [Directory Information Base]. ([RFC 4512]) 

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[RFC 4512] clearly distinguishes the [{$pagename}] as the Structure or the [entries|LDAP Entry] and the [Directory Information Base] as the [Information|Data]. \\Often RFCs and other documents do not make any distinction and use only [{$pagename}] for both the "Structure" and the "[Information|Data]"
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The [{$pagename}] contains one or more [Naming Context], which are the base entries for the server, and every other [entry|LDAP Entry] is descended from one of those [Naming Contexts] entries.  That is, a naming context entry is special in that it does not have a parent entry.

The following is a graphical example of a [DIT]:

[{Image src='/images/DIT.png' caption='Directory Information Tree Structure' align ='left' style='font-size: 120%;'}] \\

In this example, the entry "dc=example,dc=com" is the [NamingContext], and it has two immediate children, with DNs of "ou=People,dc=example,dc=com" and "ou=Groups,dc=example,dc=com", respectively, and each of those entries has its own subordinate entries.  
There is no predefined limit to the maximum depth of a directory tree, and any [LDAP Entry] can potentially have one or more subordinate entries.  An [LDAP Entry] that does not contain any subordinates is said to be a [Leaf Entry], and any entry that has at least one subordinate entry is called a [non-leaf entry|DefinitionNonLeafEntry].


From [RFC 2251]\\
"The LDAP protocol assumes there are one or more servers which jointly provide access to a [Directory Information Tree] ([DIT])."\\
...\\
The largest collection of entries, starting at an entry that is mastered by a particular server, and including all its subordinates and their subordinates, down to the entries which are mastered by different servers, is termed a [Naming Context].  The root of the DIT is a DSA-specific Entry (DSE) and not part of any naming context: each server has different attribute values in the root [DSE].  ([DSA] is an [X.500] term for the directory server)."

So each [{$pagename}] consist of one or more servers ([Directory System Agents] ([DSA]). Each server consist of one or more [Naming Contexts]

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]