What is the effect of LLQ in QoS configurations?

• A. It provides strict priority for selected traffic streams.
• B. It enforces equal sharing among all traffic classes.
• C. It applies only to data traffic.
• D. It blocks all signaling traffic.

Answer: (A)

Low-Latency Queuing focuses on speeding up time-sensitive traffic by placing it into a strict priority path in the queue. When you configure LLQ, a designated class—typically voice or signaling—gets a strict priority queue, and packets in that class are sent before any others. This minimizes delay and jitter for those streams, which is exactly why LLQ is used for real-time traffic.

The rest of the traffic is still handled, but with normal queuing (such as weighted round robin or similar) to share the remaining bandwidth. So LLQ provides strict priority for selected streams, rather than enforcing equal sharing among all classes. It isn’t limited to data traffic; signaling can be included in the high-priority class if you classify it as such. Be mindful that a continuously busy high-priority stream can starve other traffic, so tuning may be needed to avoid unintended performance issues.