350-501 Automation and Quality of Service Practice Question
During a maintenance window, an automation script pushed a QoS policy that inadvertently changed the marking for all inbound traffic on a core interface. The change was rolled back, but performance reports show that some traffic is still being marked incorrectly. What is the most logical explanation?
⚠ Common exam trap
Cisco often tests the concept that QoS policies are directional and that a rollback must consider both inbound and outbound policies independently, leading candidates to overlook the possibility of a separate outbound marking policy still being active.
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 rolled back policy was applied inbound, but the outbound policy that also applies marking was not rolled back
QoS policies can be applied independently in the inbound and outbound directions on an interface. If the original automation script modified the inbound marking policy, and the rollback only reverted that inbound policy, any outbound policy that also performs marking would remain unchanged and continue to incorrectly mark traffic. This explains why some traffic still shows incorrect marking after the rollback.
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 automation script used RESTCONF which requires a commit to finalize
Why it's wrong here
RESTCONF commits immediately; if rollback was performed, it would have undone the change.
- ✗
The device requires a reload to clear the old marking
Why it's wrong here
Cisco IOS does not require a reload to clear marking changes; removal of the policy is immediate.
- ✗
The rollback script only applied to the outbound direction
Why it's wrong here
The original change was inbound, so the rollback script likely targeted the inbound direction; the problem is likely outbound.
- ✓
The rolled back policy was applied inbound, but the outbound policy that also applies marking was not rolled back
Why this is correct
The automation may have only rolled back the inbound policy, leaving the outbound marking policy active, which continues to mark traffic.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 350-501 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-501 exam.