- A
Change the video class to 'priority level 2' to give it preferential treatment over data.
Why wrong: Using a second priority level for video can still cause voice jitter and is not recommended for video.
- B
Remove the police from the voice class and add 'priority level 1' without police; this ensures voice is priority queued without dropping.
Priority queuing with no police allows voice packets to be transmitted ahead of other queues, avoiding drops.
- C
Add a 'police' to the video class with a CIR of 40 Mbps and 'conform-action transmit exceed-action drop' to protect voice.
Why wrong: Video already has a bandwidth guarantee; policing video will not solve voice drops and may cause video loss.
- D
Change the voice class to use 'bandwidth remaining percent 10' and remove the police.
Why wrong: Voice requires strict priority, not just bandwidth guarantee, to meet delay requirements.
Quick Answer
The answer is to remove the police from the voice class and keep only the priority level 1 command. This resolves the voice drops and video jitter because applying a police rate under a priority queue in HQoS creates a hard cap that drops voice packets exceeding 10 Mbps, defeating the purpose of strict priority queuing. By removing the police, voice traffic is strictly prioritized without a rate limit, allowing it to pass through the parent shaper’s 100 Mbps aggregate without being dropped, which in turn prevents the bursty policing of voice from causing jitter in the video class. On the Cisco SPCOR 350-501 exam, this scenario tests your understanding of the interaction between priority queuing and policing in hierarchical QoS on the ASR 9000—a common trap is thinking a police rate is needed under priority, but the parent shaper already enforces the total bandwidth. Remember the memory tip: “Priority without police, parent shaper enforces the piece.”
350-501 Automation and Quality of Service Practice Question
This 350-501 practice question tests your understanding of automation and quality of service. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 deploying QoS on a Cisco ASR 9000 router to support a triple-play service (voice, video, data) over an Ethernet access network. The network engineer must ensure that voice traffic (EF) is prioritized, video traffic (AF41) is treated with low loss, and data traffic (default) gets best-effort service. Additionally, the engineer must implement a hierarchical QoS policy to shape the aggregate subscriber traffic to 100 Mbps on a GigabitEthernet interface, with the following per-class bandwidth allocations: voice 10 Mbps, video 40 Mbps, and data 50 Mbps. During testing, voice packets are being dropped under congestion, and video traffic is experiencing jitter. The current QoS configuration is as follows:
policy-map CHILD
class VOICE
priority level 1 police rate 10 mbps
class VIDEO
bandwidth remaining ratio 40
class DATA
bandwidth remaining ratio 50 ! policy-map PARENT
class class-default
shape average 100 mbps service-policy CHILD !
Which action should the engineer take to resolve the issues while maintaining the design objectives?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Remove the police from the voice class and add 'priority level 1' without police; this ensures voice is priority queued without dropping.
Option B is correct because the current configuration uses a police rate of 10 Mbps under the voice priority class, which causes voice packets to be dropped when they exceed that rate, even though priority queuing should guarantee low latency. Removing the police and keeping 'priority level 1' allows voice traffic to be strictly prioritized without a hard rate limit, ensuring no drops for voice while still allowing the parent shaper to enforce the aggregate 100 Mbps. This resolves the voice drops and, by preventing voice from being policed, reduces jitter for video traffic that might otherwise be affected by bursty voice drops.
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.
- ✗
Change the video class to 'priority level 2' to give it preferential treatment over data.
Why it's wrong here
Using a second priority level for video can still cause voice jitter and is not recommended for video.
- ✓
Remove the police from the voice class and add 'priority level 1' without police; this ensures voice is priority queued without dropping.
Why this is correct
Priority queuing with no police allows voice packets to be transmitted ahead of other queues, avoiding drops.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Add a 'police' to the video class with a CIR of 40 Mbps and 'conform-action transmit exceed-action drop' to protect voice.
Why it's wrong here
Video already has a bandwidth guarantee; policing video will not solve voice drops and may cause video loss.
- ✗
Change the voice class to use 'bandwidth remaining percent 10' and remove the police.
Why it's wrong here
Voice requires strict priority, not just bandwidth guarantee, to meet delay requirements.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a police rate on a priority class is necessary to protect other classes, when in fact the parent shaper already limits the aggregate, and the priority queue should be left unpoliced to avoid dropping delay-sensitive voice traffic.
Detailed technical explanation
How to think about this question
In Cisco IOS XR, the 'priority' command under a policy-map creates a strict priority queue that is serviced before any other queues, but when combined with a 'police' command, the policer can drop packets even if the parent shaper has not reached its limit, because the policer operates independently at the child level. The parent shaper at 100 Mbps ensures the aggregate rate, but the child police on voice creates a hard ceiling that can cause drops during micro-bursts, which is why removing the police and relying solely on the parent shaper and priority queuing is the correct approach for EF traffic. This scenario is common in triple-play deployments where voice must never be dropped, and the parent shaper provides the necessary aggregate rate limiting without per-class policers.
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.
- →
Automation and Quality of Service — study guide chapter
Learn the concepts, then practise the questions
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Automation and Quality of Service practice questions
Targeted practice on this topic area only
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FAQ
Questions learners often ask
What does this 350-501 question test?
Automation and Quality of Service — This question tests Automation and Quality of Service — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Remove the police from the voice class and add 'priority level 1' without police; this ensures voice is priority queued without dropping. — Option B is correct because the current configuration uses a police rate of 10 Mbps under the voice priority class, which causes voice packets to be dropped when they exceed that rate, even though priority queuing should guarantee low latency. Removing the police and keeping 'priority level 1' allows voice traffic to be strictly prioritized without a hard rate limit, ensuring no drops for voice while still allowing the parent shaper to enforce the aggregate 100 Mbps. This resolves the voice drops and, by preventing voice from being policed, reduces jitter for video traffic that might otherwise be affected by bursty voice drops.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 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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