The correct answer is that the NETCONF capability :candidate is not advertised by the device. When a NETCONF session is established but edit-config operations fail, the most likely cause is that the device does not support or advertise the :candidate datastore capability, which is required to stage and commit configuration changes in a candidate datastore. Without this capability, any attempt to use the candidate datastore in an edit-config operation will be rejected, even if the session itself is active. On the Cisco SPCOR 350-501 exam, this scenario tests your understanding of NETCONF capabilities negotiation during session setup—a common trap is assuming a successful session guarantees all operations will work. Remember that capabilities are advertised in the <hello> message, and the :candidate capability is optional; if missing, you must use the running datastore directly. A useful memory tip: “No candidate, no commit—check the hello for the missing bit.”
350-501 Architecture Practice Question
This 350-501 practice question tests your understanding of architecture. 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.
An SP is using NETCONF with YANG to automate VRF provisioning. The engineer notices that the NETCONF session is established but configuration changes are not applied. Which issue is most likely?
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 NETCONF capability :candidate is not advertised
If the device does not advertise the :candidate capability, edit-config operations that use the candidate datastore will fail. Option A: YANG model support might be an issue but less likely if session established; Option B: write access is typically based on user permissions; Option D: :url capability is optional for loading configs. Thus C is correct.
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 YANG model does not support the target configuration datastore
Why it's wrong here
Datastore support is independent of YANG model; NETCONF defines datastores.
✓
The NETCONF capability :candidate is not advertised
Why this is correct
If :candidate is not advertised, the device does not support candidate datastore, and edit-config with candidate fails.
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 does not support :url capability
Why it's wrong here
The :url capability is optional and not required for basic configuration changes.
✗
The user does not have write access to the candidate datastore
Why it's wrong here
This would cause a different error, but the session is established implying initial access.
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.
Architecture — This question tests Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The NETCONF capability :candidate is not advertised — If the device does not advertise the :candidate capability, edit-config operations that use the candidate datastore will fail. Option A: YANG model support might be an issue but less likely if session established; Option B: write access is typically based on user permissions; Option D: :url capability is optional for loading configs. Thus C is correct.
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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