Based on Cisco’s best practice recommendation, where should classification and marking be applied in a network?

A.
in the core

B.
at the access layer

C.
at the distribution layer

D.
as close to the source as possible

E.
as close to the desalination as possible

Explanation:

Good QoS design calls for the marking of packets close to the source of the packet.
Reference: DQOS Exam Certification Guide p.849