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6 changes: 6 additions & 0 deletions source/core/security-internal-authentication.txt
Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,12 @@ You can authenticate members of :term:`replica sets <replica set>` and
the members, MongoDB can use either keyfiles or :ref:`x.509 <security-auth-x509>`
certificates.

The selected method is used for all internal communication. For example, when a
client authenticates to a :binary:`~bin.mongos` using one of the supported
:ref:`authentication mechanisms <security-authentication-mechanisms>`,
the ``mongos`` then uses the configured internal authentication method to
connect to the required :binary:`~bin.mongod` processes.

.. note::

Enabling internal authentication also enables :doc:`client
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