- A
Use only LLQ for all three classes.
Why wrong: LLQ typically supports only one strict priority queue; multiple priority queues are not standard.
- B
Apply LLQ for voice and CBWFQ for video and data with bandwidth ratio 2:1.
LLQ provides strict priority; CBWFQ allocates bandwidth as needed.
- C
Apply CBWFQ with bandwidth percentages to all three classes.
Why wrong: CBWFQ does not provide strict priority for voice; voice could be delayed.
- D
Use FIFO queuing with WRED for all classes.
Why wrong: FIFO does not differentiate traffic.
Question 553 of 1,000
350-501 Automation and Quality of Services Practice Question
This 350-501 practice question tests your understanding of automation and quality of services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A service provider is designing a QoS policy for a business VPN service that carries voice, video, and data. The policy must ensure that voice (EF) is never dropped even during congestion, while video (AF41) and data (AF21) share the remaining bandwidth in a ratio 2:1. Which queuing strategy should be used?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"never"Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
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
✓
Apply LLQ for voice and CBWFQ for video and data with bandwidth ratio 2:1.
Option B is correct because LLQ provides strict priority queuing for voice (EF), ensuring it is never dropped during congestion, while CBWFQ allows the remaining bandwidth to be shared among video (AF41) and data (AF21) in a 2:1 ratio. LLQ is designed to guarantee low latency for real-time traffic, and CBWFQ enables explicit bandwidth allocation for non-real-time classes. This combination meets the requirement of zero-drop for voice and proportional sharing for video and data.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use only LLQ for all three classes.
Why it's wrong here
LLQ typically supports only one strict priority queue; multiple priority queues are not standard.
- ✓
Apply LLQ for voice and CBWFQ for video and data with bandwidth ratio 2:1.
Why this is correct
LLQ provides strict priority; CBWFQ allocates bandwidth as needed.
Clue confirmation
The clue word "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Apply CBWFQ with bandwidth percentages to all three classes.
Why it's wrong here
CBWFQ does not provide strict priority for voice; voice could be delayed.
- ✗
Use FIFO queuing with WRED for all classes.
Why it's wrong here
FIFO does not differentiate traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that LLQ can be applied to multiple traffic classes simultaneously without understanding that only one strict priority queue is supported, and that CBWFQ alone cannot guarantee zero-drop for real-time traffic.
Detailed technical explanation
How to think about this question
LLQ uses a strict priority queue that is serviced before any CBWFQ queues, ensuring that EF-marked voice packets are transmitted with minimal delay and zero loss under congestion, as long as the policer is configured to prevent priority queue starvation. CBWFQ allocates bandwidth based on configured weights or percentages, and when combined with LLQ, the remaining bandwidth after priority traffic is distributed according to the defined ratios. In real-world deployments, the priority queue must be policed to avoid monopolizing link capacity, and the 2:1 ratio for AF41 and AF21 can be implemented using the 'bandwidth percent' command under class maps.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 350-501 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Automation and Quality of Services — study guide chapter
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FAQ
Questions learners often ask
What does this 350-501 question test?
Automation and Quality of Services — This question tests Automation and Quality of Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Apply LLQ for voice and CBWFQ for video and data with bandwidth ratio 2:1. — Option B is correct because LLQ provides strict priority queuing for voice (EF), ensuring it is never dropped during congestion, while CBWFQ allows the remaining bandwidth to be shared among video (AF41) and data (AF21) in a 2:1 ratio. LLQ is designed to guarantee low latency for real-time traffic, and CBWFQ enables explicit bandwidth allocation for non-real-time classes. This combination meets the requirement of zero-drop for voice and proportional sharing for video and data.
What should I do if I get this 350-501 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "never". Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.
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