Your network contains an Active Directory domain named contoso.com. The domain
contains a domain controller named DC1. DC1 has the DNS Server 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. (Click the Exhibit button.)
You open the properties of a static record named Server1 as shown in the Server1 Record
exhibit.(Click the Exhibit button.)
You discover that the scavenging process ran today, but the record for Server1 was not
deleted.
You run dnscmd.exe and specify the age all records 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
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 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.