300-320 · Question #537
300-320 Question #537: Real Exam Question with Answer & Explanation
The correct answer is B: The traffic must be policed and not allowed to pass. Real-time traffic (voice, video) is placed in a Low-Latency Queue (LLQ) or Priority Queue (PQ) and given strict priority scheduling. When traffic in the real-time queue exceeds its configured rate, it must be policed-meaning excess packets are dropped immediately. Shaping is expl
Question
Options
- AThe traffic must be remarked to a low priority to and allowed pass
- BThe traffic must be policed and not allowed to pass
- CThe traffic within the real-time queue must not be limited
- DThe traffic must be shaped to allow for it to be transmitted after the tokens have been replenished
Explanation
Real-time traffic (voice, video) is placed in a Low-Latency Queue (LLQ) or Priority Queue (PQ) and given strict priority scheduling. When traffic in the real-time queue exceeds its configured rate, it must be policed-meaning excess packets are dropped immediately. Shaping is explicitly wrong here because shaping buffers excess packets in a queue and retransmits them later; this introduces variable delay (jitter) that destroys real-time application quality. Remarking and passing traffic would allow the rate to be exceeded. Therefore, policing with a drop action is the only correct method to enforce rate limits on real-time queues without causing jitter.
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