The answer is that the service has not been committed. In Cisco NSO, all configuration changes, including those made by a managed L3VPN service, are held in a candidate database until an explicit commit operation is performed. Without this commit, the changes remain staged and are never pushed to the target devices, which explains why the devices show no updated configuration. This scenario directly tests your understanding of NSO’s transactional model on the Cisco SPCOR 350-501 exam, where a common trap is assuming that deploying a service automatically applies changes to the network. To avoid this pitfall, remember that in NSO, a service is just a template until you commit—think of it as “no commit, no update.” A useful memory tip is to associate the word “commit” with “complete”: the configuration is not complete until you commit.
350-501 Automation and Assurance Practice Question
This 350-501 practice question tests your understanding of automation and assurance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer is using Cisco NSO to create a managed L3VPN service. After deploying the service, the engineer notices that the configuration on the devices is not being updated. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The service has not been committed.
In NSO, services are committed to push configuration changes to devices. If the commit is not performed, the changes remain in the candidate database and are not applied. Other options are less likely given the symptom.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 service model is not compiled.
Why it's wrong here
An uncompiled model would prevent service creation, not just device update failure after deployment.
✓
The service has not been committed.
Why this is correct
In NSO, commit is required to push the configuration to devices; without it, the configuration remains in the candidate.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The device is not in the device list.
Why it's wrong here
If the device were not in the list, the service deployment would likely fail with an error, not silently not update.
✗
The sync-from command was not run.
Why it's wrong here
Sync-from is used to pull device configurations into NSO, not to push changes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 350-501 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 350-501 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Automation and Assurance — This question tests Automation and Assurance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The service has not been committed. — In NSO, services are committed to push configuration changes to devices. If the commit is not performed, the changes remain in the candidate database and are not applied. Other options are less likely given the symptom.
What should I do if I get this 350-501 question wrong?
Identify which 350-501 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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