A DIT hierarchy can enable certain types of access control. As with replication, it is easier to group similar entries and to administer the entries from a single branch.
A hierarchical DIT also enables distributed administration. For example, you can use the DIT to give an administrator from the marketing department access to marketing entries, and an administrator from the sales department access to sales entries.
You can also set access controls based on directory content, rather than the DIT. Use the ACI filtered target mechanism to define a single access control rule. This rule states that a directory entry has access to all entries that contain a particular attribute value. For example, you can set an ACI filter that gives the sales administrator access to all entries that contain the attribute ou=Sales.
However, ACI filters can be difficult to manage. You must decide which method of access control is best suited to your directory: organizational branching in the DIT hierarchy, ACI filters, or a combination of the two.