You work as the network administrator at Domain.com. The Domain.com network consists of a single Active Directory domain named Domain.com. Domain.com has its headquarters located in London and branch office located in Paris. All servers on the Domain.com network run Windows Server 2008 and all client computers run Windows Vista. The London and Paris office are connected via a WAN link.
Domain.com currently makes use of a computer named CERTKILLER-SR01 configured as a DNS server hosting the Active Directory Integrated zone and CERTKILLER-SR02 in the Paris office configured as a DNS server hosting the secondary zone for Domain.com. Domain.com has recently requested that you configure CERTKILLER-SR02 to have CERTKILLER-SR01 as the DNS Master server for the zone whilst minimizing the DNS zone transfer traffic over the WAN link.
What should you do?
A.
You should consider having the refresh interval setting increased in the Start of Authority (SOA) record for the zone.
B.
You should consider having the refresh interval setting decreased in the Start of Authority (SOA) record for the zone.
C.
You should consider having the Retry Interval setting decreased in the Start of Authority (SOA) record for the zone.
D.
You should consider having the netmask ordering option disabled in the properties of CERTKILLER-SR01.
Explanation:
In the scenario you should consider having the Refresh Interval setting increased in the Start Of Authority record for the zone to have DNS zone transfer traffic minimized over the WAN link. You should additionally note that the Refresh Interval is responsible for informing the secondary name server when to poll the primary names server and how often to check for a serial number change.
You should also be aware that the Refresh Interval effects how long DNS changes made on the Primary server takes to propagate which means the configurations made would ensure that zone transfers occur less frequently.
Reference : DNS Resource Records / SOA Record Data Fields http://www.cisco.com/en/US/tech/ck648/ck362/technologies_tech_note09186a0080094727.shtml# topic2