300-420 · Question #51
An engineer is designing a QoS policy that queues excess packets for later transmission. Which mechanism must be included in the design?
The correct answer is A. shaping. Traffic shaping buffers packets that exceed the configured rate in a queue and retransmits them later, smoothing the traffic flow to conform to a target rate. This is the defining characteristic of shaping - it delays but does not drop excess traffic. Policing (C), by contrast…
Question
An engineer is designing a QoS policy that queues excess packets for later transmission. Which mechanism must be included in the design?
Options
- Ashaping
- BWRED
- Cpolicing
- DRED
How the community answered
(53 responses)- A92% (49)
- B4% (2)
- C2% (1)
- D2% (1)
Explanation
Traffic shaping buffers packets that exceed the configured rate in a queue and retransmits them later, smoothing the traffic flow to conform to a target rate. This is the defining characteristic of shaping - it delays but does not drop excess traffic. Policing (C), by contrast, immediately drops or re-marks packets that exceed the rate; it does not queue them. WRED (B) and RED (D) are congestion avoidance mechanisms that proactively drop packets before a queue fills up - they do not queue traffic for later delivery. Only shaping matches the requirement of storing excess packets and transmitting them when bandwidth is available.
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