First level if access. The line in the file means that the request from any server (*) will be mapped to local "root" account.
Second level that overrides exports. If the file is empty, then whatever is in the exports holds.
Third layer of access that overrides users. If this file is empty, then whatever is in users holds.
Correct. All inbound connections map to the root user, regardless of anything else. Exports is first in order of precedence.
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