Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) — Question 139

How does QoS traffic shaping alleviate network congestion?

Answer options

• 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.

Correct answer: B

Explanation

Option B is correct because QoS traffic shaping manages bandwidth by buffering packets that exceed the committed rate, which helps to prevent immediate congestion. Option A is incorrect since dropping packets does not alleviate congestion but may exacerbate issues. Option C misrepresents the function of traffic shaping, as it does not fragment packets for queuing. Option D, while it mentions dropping packets, does not effectively address how QoS traffic shaping manages network flow.