There is nothing auditing there!
You must just enabling scaveging for zones and on setup this setting on one server 
No need to afraid: this setting doesn't make black magic, but 95% administrators fall into issues with duplicate or "stale" records.
Sorry, can't spent much time and hope you read all links from Ace's post carefully. 
Thanks, Dima.
Пятница, 29 апреля 2016, 22:22 +03:00 от Lisa Faulkner <lisa.k.faulkner@xxxxxxxxxxxxxxxx>:

Thanks, Dina. Can you explain this more? We do have current timestamped entries. Are you saying the zone should be set to age and scavenge but not have a server scavenging? We need to do a thorough audit before we fully enable scavenging. 
Sent from my iPhone
On Apr 29, 2016, at 12:11 PM, Dmitriy <mozhaika@xxxxxxxxxxxxxxxx> wrote:

Hello, Lisa!
Check DNS scaveging setting. If it is disabled, there is no Dynamic Updates for AD-replicated zones, cause AD is smart enough don't replicate stuff without timespamps.
Kind regards, Dima.