350-501 Automation and Quality of Services Practice Question
A service provider is deploying a QoS policy for a customer with voice, mission-critical data, and best-effort traffic. The voice requires strict priority and low latency. Which queuing mechanism should be used to ensure voice packets are always served before other queues, and what additional measure is necessary to prevent voice traffic from starving other traffic?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
LLQ for voice; policing on the priority queue to limit voice traffic to a configured rate.
LLQ provides a strict priority queue for delay-sensitive traffic like voice. However, to prevent starvation of other traffic, policing must be applied to the priority queue to limit the amount of voice traffic allowed into it.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
FIFO queuing with a priority list; no policing needed because FIFO handles voice adequately.
Why it's wrong here
FIFO does not prioritize voice; all packets are treated equally, causing delay for voice.
- ✗
CBWFQ with bandwidth percent for voice; no additional measure needed because CBWFQ inherently prevents starvation.
Why it's wrong here
CBWFQ does not provide a strict priority queue; voice would experience delay if other queues are congested.
- ✗
WRED for voice; tail drop for data; this ensures low latency for voice.
Why it's wrong here
WRED is a congestion avoidance mechanism, not a queuing mechanism. It does not provide priority for voice.
- ✓
LLQ for voice; policing on the priority queue to limit voice traffic to a configured rate.
Why this is correct
LLQ places voice in a strict priority queue; policing prevents voice from exceeding its allocated bandwidth and starving other queues.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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