What are the three primary functions of the distribution layer of the campus network design
hierarchy? (Choose three.)

A.
provide end-user connectivity

B.
provide high speed transport

C.
provide QoS services

D.
enforce security policies

E.
provide WAN connections

F.
connect access devices to the core backbone

Explanation:

C, D, F are properties of distribution layer.
Link: http://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/campover.html#wp708979