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Add a warning about potential performance implications of configuring a non-root zone as a mirror zone. Explain in more detail how each mirror zone version is validated and how validation failures are handled. Move the paragraphs describing how to set up IANA root zone mirroring higher up, so that they can be more easily found by the reader. Explicitly state that the "masters" option needs to be present for any mirror zone which is not the root zone. Tweak the description of the interaction between the "dnssec-validation" setting and root zone mirroring to make it less ambiguous. Specify what the default "notify" setting is for mirror zones.
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