Application Partition
Perhaps the most significant feature in Windows Server 2012 DNS implementation, Active Directory-integrated zones are stored in the application partition of the AD. For every domain in a forest, a separate application partition is created and is used to store all records that exist in each AD-integrated zone. Because the application partition is not included as part of the Global Catalog, DNS entries are no longer included as part of global catalog replication.
With the application partition concept, replication loads are now reduced while important zone information is delegated to areas of the network where they are needed.
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