350-501 Automation and Quality of Services Practice Question
An SP engineer is configuring hierarchical QoS on a PE router to enforce a per-subscriber bandwidth contract of 10 Mbps and prioritize voice within that contract. Which MQC configuration sequence is correct?
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
✓
Define child class-map and policy-map with LLQ, then parent policy-map with shape and service-policy child, applied to interface.
Hierarchical QoS uses a parent policy for shaping and a child policy for classification and priority queuing. The child is applied to the parent's class-default.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Define parent policy-map with shape, then child policy-map with LLQ, apply child directly to interface.
Why it's wrong here
Child should be applied via parent's service-policy, not directly.
- ✗
Use policing in the parent policy to enforce 10 Mbps and child for LLQ.
Why it's wrong here
Parent should shape, not police, for traffic smoothing under contract.
- ✗
Define one policy-map with both shape and LLQ in the same class.
Why it's wrong here
Hierarchical QoS requires separate parent and child policies.
- ✓
Define child class-map and policy-map with LLQ, then parent policy-map with shape and service-policy child, applied to interface.
Why this is correct
This correctly implements H-QoS: child policy first, then parent with shape and child policy reference.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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