Your company has a main office and a branch office.
The network contains an Active Directory domain named contoso.com.
The main office contains a domain controller named DC1 that runs Windows Server 2012 R2.
DC1 is a DNS server and hosts a primary zone for contoso.com. The branch office contains a member server
named Server1 that runs Windows Server 2012 R2. Server1 is a DNS server and hosts a secondary zone for
contoso.com.
The main office connects to the branch office by using an unreliable WAN link.
You need to ensure that Server1 can resolve names in contoso.com if the WAN link in unavailable for three
days.
Which setting should you modify in the start of authority (SOA) record?
A.
Retry interval
B.
Refresh interval
C.
Expires after
D.
Minimum (default) TTL
Explanation:
Used by other DNS servers that are configured to load and host the zone to determine when zone data expires
if it is not renewed
C:
Expires After The period of time for which zone information is valid on the secondary server. If the secondary server can’t download data from a primary server within this period, the secondary server lets the data in its cache expire and stops responding to DNS queries. Setting Expires After to seven days allows the data on a secondary server to be valid for seven days.
https://msdn.microsoft.com/en-us/library/bb727018.aspx