In a distributed directory, each piece of data is stored on only one server. The namespace is partitioned and each partition is stored on a different server.
In a replicated directory, each piece of data is held on more than one server. The entire namespace is stored in more than one place.
You can use both replication and distribution in the same system. The namespace is partitioned over many different servers, and at least some sections of the namespace are also copied and stored in more than one place.
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