Refer the exhibit.
Users on a network connected to router R3 report slow speeds when they connect to the server connected to R2. After analyzing traffic on the network, a network engineer identified congestion on the link between R2 and R3 as the cause.
Which QoS service must the engineer implement to drop traffic on the link when it exceeds a configured threshold?
A. first-in, first-out
B. traffic shaping
C. class-based weighted fair queueing
D. traffic policing
