Your network contains an Active Directory domainnamed contoso.com.
The domain contains a domain controllernamed DC1.
DC1has the DNS Server roleinstalled and hosts an Active Directory-integrated zone for contoso.com.
The no-refresh intervaland the refresh intervalare both set to three days.
The Advanced DNS settingsof DC1are shown in the Advanced DNS Settings exhibit:
You open the propertiesof a static recordnamed Server1as 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.exeand specify the ageallrecords parameter.
You need to identify when the record for Server1 will be deleted from the zone.
In how many dayswill the record be deleted?
A.
13
B.
10
C.
23
D.
7
Explanation:
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 willhold 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 recordsare 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, whenyou set No-refresh interval to 3 days and Refresh interval to
5 days, scavenging will delete records that are more than 8 days old.