350-501 Automation and Quality of Services Practice Question
A service provider is implementing hierarchical QoS on an edge router. The goal is to shape the aggregate traffic to 100 Mbps and then apply different queuing policies for voice and data within that shaped pipe. Which configuration approach 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
✓
Configure a parent policy-map with shape and a child policy-map with queuing, then apply the child under the parent's class.
Hierarchical QoS uses a parent policy for shaping and a child policy for classification and queuing. The parent policy applies shape, and the child policy is attached to a class within the parent.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Apply shaping on the interface and queuing on a subinterface separate from the policy-map.
Why it's wrong here
Hierarchical QoS uses nested policy-maps, not separate interface configurations.
- ✗
Use a child policy-map for shaping and a parent policy-map for queuing.
Why it's wrong here
Shaping is applied in the parent, queuing in the child.
- ✓
Configure a parent policy-map with shape and a child policy-map with queuing, then apply the child under the parent's class.
Why this is correct
This is the correct hierarchical QoS design: parent shapes, child queues.
- ✗
Apply a single policy-map with both shape and queue commands under the same class.
Why it's wrong here
Hierarchical QoS requires separate parent and child policies.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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