How does QoS traffic shaping alleviate network congestion?

How does QoS traffic shaping alleviate network congestion?
A . It drops packets when traffic exceeds a certain bitrate.
B. It buffers and queues packets above the committed rate.
C. It fragments large packets and queues them for delivery.
D. It drops packets randomly from lower priority queues.

View Answer

Answer: B

Explanation:

Reference: https://www.cisco.com/c/en/us/support/docs/quality-of-service-qos/qos-policing/19645-policevsshape.html