How to properly configure aging/scavenging for my AD domain zone

I've read several articles on how to properly configure aging/scavenging of stale DNS records and need clarification.  

1. From what I've read, I can't quite tell if I can enable scavenging only on a zone, or if it must be enabled first on the server then on the zone.

2. Once scavenging is enabled and configured, what exactly does the "No-refresh interval" and "Refresh Interval" configuration affect the scavenging of stale records?

3. If the zone does not have the "Enable automatic scavenging of stale records" option checked, it is possible that scavenging can still occur, even if it is not manually triggered?

I recently took over AD administrative duties at my company and have been going over the other administrator's configurations.  It appears that our AD DNS zone is pretty clean.  I've looked for servers and workstations that have been decommissioned, and they do not appear in the zone.  Only the AD DNS zone is configured for scavenging (no-refresh and refresh interval are both set to 1 day), and the "enable automatic scavenging of stale records" option is not checked.  We have approximately 20 domain controllers throughout the org, so I do not want to experiment with settings of course.  Any help is greatly appreciated.

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fedsigAuthor Commented:
Yes it was. Why a B grade though? I can't find any more comprehensive or easy to understand than those two articles, but you're entitled to allocate grades as you see fit.
Glad you're sorted out. :o)
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