350-501 Automation and Quality of Service Practice Question
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?
⚠ Common exam trap
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.
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
✓
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.
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%.
- ✗
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.
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