The ARPA domain can be tuned better to the needs of negative caching than the
root zone, having a negative caching of a week in ARPA will not cause any
problems. Currently the root has one day, if in the future there are
frequent adds/deletes of names in the root zone the operators may
want to lower that value.
That's the first plausible argument I've heard. (It's not overwhemingly
persuasive, but at least plausible.) It would be nice if it could be in
the draft for future readers.
R's,
John
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