350-501 Automation and Quality of Service Practice Question
Exhibit
Refer to the exhibit. policy-map SHAPE-1M class class-default shape average 1000000 ! policy-map CHILD-QOS class VOICE priority level 1 police cir 256000 class DATA bandwidth remaining ratio 50 class MANAGEMENT bandwidth remaining ratio 10 ! interface GigabitEthernet0/0/0/0.100 service-policy output SHAPE-1M service-policy output CHILD-QOS
Refer to the exhibit. An engineer applies two service policies to the same subinterface in the outbound direction. Which statement describes the expected behavior?
⚠ Common exam trap
Candidates often assume multiple service policies can be stacked or merged in the same direction, but Cisco enforces a strict one-policy-per-direction rule, making the second policy silently ignored.
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
✓
Only the SHAKE-1M policy is applied; the CHILD-QOS policy is ignored.
When two service policies are applied to the same subinterface in the same direction, the router only honors the first policy applied; the second policy is ignored. In this case, SHAKE-1M was applied first, so CHILD-QOS is not processed. Cisco IOS does not allow multiple service policies in the same direction on a single interface or subinterface, as each direction can have only one active policy-map.
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 router automatically nests CHILD-QOS inside SHAKE-1M creating hierarchical QoS.
Why it's wrong here
Hierarchical QoS must be explicitly configured using a parent-child service-policy.
- ✗
The router compiles a combined policy that merges classifications.
Why it's wrong here
No merging; only one policy is active.
- ✓
Only the SHAKE-1M policy is applied; the CHILD-QOS policy is ignored.
Why this is correct
Correct: Only one output policy allowed per interface on IOS XR.
- ✗
Both policies are applied sequentially; traffic is shaped then classified.
Why it's wrong here
Only the first policy applied takes effect.
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Written by Johnson Ajibi, MSc IT Security
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