350-501 Automation and Quality of Service Practice Question
Exhibit
Refer to the exhibit. class-map match-any VOICE match ip dscp ef class-map match-any VIDEO match ip dscp af41 af42 class-map match-any DATA match ip dscp default ! policy-map QOS_POLICY class VOICE priority level 1 set mpls experimental topmost 5 class VIDEO bandwidth remaining percent 30 set mpls experimental topmost 4 class DATA bandwidth remaining percent 70 set mpls experimental topmost 0 ! interface GigabitEthernet0/0/0 service-policy output QOS_POLICY
Which TWO statements accurately describe the behavior of the QoS policy shown in the exhibit?
⚠ Common exam trap
Cisco often tests the distinction between 'bandwidth' (which allocates a guaranteed minimum during congestion) and 'bandwidth remaining percent' (which allocates a percentage of leftover bandwidth after priority queues), and candidates frequently confuse 'police' with 'shape' or misinterpret a fixed police rate as a percentage of interface 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
✓
During congestion, video traffic is allocated 30% of the remaining bandwidth after voice is served.
The policy uses the 'bandwidth remaining percent' command under the video class, which allocates 30% of the remaining bandwidth after the voice class (which is in a strict priority queue) has been served. This is the standard behavior for class-based weighted fair queuing (CBWFQ) when a priority queue is present: the priority traffic is serviced first, and then the remaining bandwidth is distributed according to the 'bandwidth remaining percent' values assigned to the non-priority classes.
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 policy shapes the total output traffic to 30 Mbps.
Why it's wrong here
No shaping command is present; the policy only manages queuing.
- ✓
During congestion, video traffic is allocated 30% of the remaining bandwidth after voice is served.
Why this is correct
Bandwidth remaining percent allocates a percentage of the available bandwidth after priority queues are serviced.
- ✗
Video traffic is placed in a strict priority queue.
Why it's wrong here
Video uses bandwidth remaining percent, not priority.
- ✗
The policy polices voice traffic to a maximum of 30% of the interface bandwidth.
Why it's wrong here
No police command is configured; the priority queue can consume all available bandwidth.
- ✓
Voice traffic is guaranteed to be sent before any other traffic.
Why this is correct
Priority level 1 ensures voice is dequeued first.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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