HOTSPOT
Your network contains an Active Directory domain named adatum.com. All servers run Windows
Server 2012 R2. All domain controllers have the DNS Server server role installed.
You have a domain controller named DC1.
On DC1, you create an Active Directory-integrated zone named adatum.com and you sign the zone
by using DNSSEC.
You deploy a new read-only domain controller (RODC) named RODC1.
You need to ensure that the contoso.com zone replicates to RODC1.
What should you configure on DC1?
To answer, select the appropriate tab in the answer area.
Answer: 
Explanation:
<map><m x1=”136″ x2=”293″ y1=”43″ y2=”62″ ss=”0″ a=”0″ /></map>For additional servers to host a zone, zone transfers are required to replicate and synchronize all
copies of the zone used at each server configured to host the zone.
Understanding zones and zone transfer
http://technet.microsoft.com/en-us/library/cc781340(v=ws.10).aspx
When DNSSEC is enabled for a AD-Integrated zone and DNS is set up on a RODC you will need to enable zone replication on the primary zone in order for the RODC DNS to replicate without errors logged to event log.
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