Your network contains an Active Directory domain named contoso.com.
The domain contains a domain controller named DC1.
DC1 has the DNS Server role installed and hosts an Active Directory-integrated zone for contoso.com.
The no-refresh interval and the refresh interval are both set to three days.
The Advanced DNS settings of DC1 are shown in the Advanced DNS Settings exhibit:
You open the properties of a static record named Server1 as shown in the Server1 Record exhibit:
You discover that the scavenging process ran today, but the record for Server1 was not deleted.
You run dnscmd.exe and specify the ageallrecords parameter.
You need to identify when the record for Server1 will be deleted from the zone. In how many days will the record be deleted?
A. 13
B. 10
C. 23
D. 7
Correct Answer: D
Explanation/Reference:
The blank Record time stamp field indicates a static record. That’s the reason it wasn’t deleted. The timestamp has been set using dnscmd /ageallrecords.
The Time to live setting means that the server will hold a cached record for 10 days, so it has nothing to do with this question. The record will become stale in six days (no-refresh interval + refresh interval, that’s 3 + 3 days), so now that the timestamp has been set it will be deleted when the next scavenging operation occurs, in seven days.
Reference 1:
http://technet.microsoft.com/en-us/library/cc772069.aspx
dnscmd /ageallrecords
Sets the current time on all time stamps in a zone or node.
Record scavenging does not occur unless the records are time stamped. Name server (NS) resource records, start of authority (SOA) resource records, and Windows Internet Name Service (WINS) resource records are not included in the scavenging process, and they are not time stamped even when the ageallrecords command runs.
Reference 2:
http://www.windowsitpro.com/article/dns/scavenging-stale-dns-records
When a record is older than the sum of the no-refresh interval and the refresh interval, the scavenging feature considers the record stale and deletes it. So, when you set No-refresh interval to 3 days and Refresh interval to 5 days, scavenging will delete records that are more than 8 days old.
