System Center 2012 Configuration Manager uses site system roles to support operations at each site.
Computers that host the Configuration Manager site are named site servers, and computers that host the other
site system roles are named site system servers.
Site system servers within the same site communicate with each other by using which protocol?

A.
SMB

B.
HTTPS

C.
HTTP

D.
Any of these

Explanation:
Site system servers within the same site communicate with each other by using server message block (SMB),
HTTP, or HTTPS, depending on the site configuration selections that you make. Because these
communications are unmanaged and can occur at any time without network bandwidth control, review your
available network bandwidth before you install site system servers and configure the site system roles.
https://technet.microsoft.com/en-us/library/gg712701.aspx#Planning_Intra_site_Com