SCCM 2012 is now configured up to 20 Site roles which you can install/Configure on single machine or distribute to different machines for load balancing .
- Site server
- Site Database Server
- Site system
- Application Catalog Web Service Point
- Application Catalog Website Point
- Asset Intelligence Synchronization Point
- Component server
- Distribution Point
- Endpoint protection Point
- Enrollment Point
- Enrollment Proxy Point
- Fallback status Point
- Management Point
- Mobile Device Management Point
- Out of band service Point
- Reporting services Point
- software update point
- State Migration Point
- System health Validator Point