AD schema Extension for SCCM 2007 /2012

When extended Active Directory (AD) 14 attributes will be created

CN=mS-SMS-Assignment-Site-Code

CN=mS-SMS-Capabilities

CN=MS-SMS-Default-MP

CN=mS-SMS-Device-Management-Point

CN=mS-SMS-Health-State

CN=MS-SMS-MP-Address

CN=MS-SMS-MP-Name

CN=MS-SMS-Ranged-IP-High

CN=MS-SMS-Ranged-IP-Low

CN=MS-SMS-Roaming-Boundaries

CN=MS-SMS-Site-Boundaries

CN=MS-SMS-Site-Code

CN=mS-SMS-Source-Forest

CN=mS-SMS-Version

When extended Active Directory (AD) 4 Classes will be created

CN=MS-SMS-Management-Point
CN=MS-SMS-Roaming-Boundary-Range
CN=MS-SMS-Server-Locator-Point
CN=MS-SMS-Site

You can find more information https://technet.microsoft.com/en-us/library/gg712272.aspx