The correct answer is that the VOICE class is allocated a strict priority queue with a bandwidth limit of 10% of the interface bandwidth. This is because the Cisco IOS configuration shown uses the `priority` command under the VOICE class, which creates a Low Latency Queue (LLQ) for strict priority treatment, and the accompanying `bandwidth percent 10` statement enforces a hard cap on how much interface bandwidth that priority queue can consume. On the Cisco SPCOR 350-501 exam, this scenario tests your understanding of LLQ priority queue with bandwidth limit behavior, a critical concept for ensuring voice traffic gets low-latency delivery without starving other data classes. A common trap is confusing the `priority` command with the `bandwidth` command used for class-based weighted fair queueing—remember, `priority` always implies strict queuing, and the percentage is a policer, not a guaranteed minimum. Memory tip: think of LLQ as a VIP lane on a highway—the car (voice) goes first, but it can only use 10% of the total road space.
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.
Exhibit
Refer to the exhibit.
class-map match-any VIDEO
match ip dscp af41 af42 af43
!
class-map match-all VOICE
match ip dscp ef
!
policy-map QOS-POLICY
class VOICE
priority percent 10
class VIDEO
bandwidth remaining percent 30
class class-default
fair-queue
!
interface GigabitEthernet0/0
service-policy output QOS-POLICY
Based on the exhibit, which statement is true about the QoS policy?
Refer to the exhibit.
class-map match-any VIDEO
match ip dscp af41 af42 af43
!
class-map match-all VOICE
match ip dscp ef
!
policy-map QOS-POLICY
class VOICE
priority percent 10
class VIDEO
bandwidth remaining percent 30
class class-default
fair-queue
!
interface GigabitEthernet0/0
service-policy output QOS-POLICY
A
The class-default will use weighted fair queuing (WFQ).
Why wrong: 'fair-queue' is used, which is a flow-based queuing, not CBWFQ.
B
The VIDEO class will be limited to 30% of the total interface bandwidth.
Why wrong: 'bandwidth remaining percent' provides a minimum guarantee, not a maximum limit.
C
The VOICE class is allocated a strict priority queue with a bandwidth limit of 10% of the interface bandwidth.
The 'priority percent 10' command provides a strict priority queue with a bandwidth limit of 10%.
D
The VIDEO class is guaranteed at least 30% of the total interface bandwidth.
Why wrong: 'bandwidth remaining percent' guarantees a percentage of the remaining bandwidth after priority, not total bandwidth.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The VOICE class is allocated a strict priority queue with a bandwidth limit of 10% of the interface bandwidth.
The exhibit shows a QoS policy where the VOICE class is configured with the 'priority' command and a bandwidth statement of 10 percent. In Cisco IOS, the 'priority' command under a class map creates a strict priority queue (LLQ), and the bandwidth percentage defines the maximum amount of interface bandwidth that can be used by this queue, ensuring low-latency treatment for voice traffic. Therefore, option C is correct.
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.
✗
The class-default will use weighted fair queuing (WFQ).
Why it's wrong here
'fair-queue' is used, which is a flow-based queuing, not CBWFQ.
✗
The VIDEO class will be limited to 30% of the total interface bandwidth.
Why it's wrong here
'bandwidth remaining percent' provides a minimum guarantee, not a maximum limit.
✓
The VOICE class is allocated a strict priority queue with a bandwidth limit of 10% of the interface bandwidth.
Why this is correct
The 'priority percent 10' command provides a strict priority queue with a bandwidth limit of 10%.
Related concept
Read the scenario before looking for a memorised answer.
✗
The VIDEO class is guaranteed at least 30% of the total interface bandwidth.
Why it's wrong here
'bandwidth remaining percent' guarantees a percentage of the remaining bandwidth after priority, not total bandwidth.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between 'bandwidth' (which guarantees a minimum bandwidth) and 'bandwidth remaining percent' (which guarantees a percentage of the leftover bandwidth after priority queues), and the trap here is that candidates mistakenly interpret 'bandwidth remaining percent' as a guarantee of total interface bandwidth rather than a share of the remaining bandwidth.
Detailed technical explanation
How to think about this question
In Cisco IOS, the 'priority' command under a class map implements Low Latency Queuing (LLQ), which creates a strict priority queue that is serviced before any other queues, ensuring minimal delay for real-time traffic like voice. The bandwidth percentage specified with 'priority' is a policer that limits the amount of traffic that can be sent in the priority queue; any excess traffic is dropped, preventing starvation of other queues. This is critical in voice deployments where jitter and delay must be minimized, and the bandwidth limit must be carefully set to avoid over-subscription of the priority queue.
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 — 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: The VOICE class is allocated a strict priority queue with a bandwidth limit of 10% of the interface bandwidth. — The exhibit shows a QoS policy where the VOICE class is configured with the 'priority' command and a bandwidth statement of 10 percent. In Cisco IOS, the 'priority' command under a class map creates a strict priority queue (LLQ), and the bandwidth percentage defines the maximum amount of interface bandwidth that can be used by this queue, ensuring low-latency treatment for voice traffic. Therefore, option C is correct.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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