Sites & Site types in SCCM 2012

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Site Types:-
System Center 2012 Configuration Manager introduces the central administration site and some changes to primary and secondary sites. 

Site
Purpose
Change from Configuration Manager 2007
Central administration site
The central administration site coordinates intersite data replication across the hierarchy by using Configuration Manager database replication. It also enables the administration of hierarchy-wide configurations for client agents, discovery, and other operations.
Use this site for all administration and reporting for the hierarchy.
Although this is the site at the top of the hierarchy in System Center 2012 Configuration Manager, it has the following differences from a central site in Configuration Manager 2007:
·         Does not process data submitted by clients, except for the Heartbeat Discovery, discovery data record.
·         Does not accept client assignments.
·         Does not support all site system roles.
·         Participates in database replication
Primary site
Manages clients in well-connected networks.
Primary sites in System Center 2012 Configuration Manager have the following differences from primary sites in Configuration Manager 2007:
·         Additional primary sites allow the hierarchy to support more clients.
·         Cannot be tiered below other primary sites.
·         No longer used as a boundary for client agent settings or security.
·         Participates in database replication.
Secondary site
Controls content distribution for clients in remote locations across links that have limited network bandwidth.
Secondary sites in System Center 2012 Configuration Manager have the following differences from secondary sites in Configuration Manager 2007:
·         SQL Server is required and SQL Server Express will be installed during site installation if required.
·         A management point and distribution point are automatically deployed during the site installation.
·         Secondary sites can send content distribution to other secondary sites.
·         Participates in database replication.

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