In a hierarchy that will contain two or more primary sites, the top-level site must be a central administration site. Unlike a 2012 central site, the central administration site is a distinct site type that is used only for administration and reporting in Configuration Manager v.Next. The central administration site coordinates intersite data replication across the hierarchy by using Configuration Manager database replication and enables administration of hierarchy-wide configurations for client agents, discovery, and other operations.
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Michael Bertuit