Question 916 of 989
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200-901 Practice Question: A developer is troubleshooting a Cisco RESTCONF…
A developer is troubleshooting a Cisco RESTCONF API call that returns a 409 Conflict error. Which two scenarios could cause this? (Choose two.)
⚠ Common exam trap
Cisco often tests the distinction between 409 Conflict and 400 Bad Request, where candidates mistakenly think invalid data types cause a conflict rather than a client-side syntax error.
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 resource's current state conflicts with the requested change (e.g., trying to delete a resource that is in use).
A 409 Conflict error in RESTCONF indicates that the request cannot be completed due to a conflict with the current state of the resource. For example, attempting to delete a resource that is referenced by other resources (e.g., a VLAN interface that is still active) violates the resource's state constraints, triggering this HTTP status code.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Authentication token is missing.
Why it's wrong here
Missing token results in 401 Unauthorized.
- ✓
The resource's current state conflicts with the requested change (e.g., trying to delete a resource that is in use).
Why this is correct
State conflicts, like deleting a resource that is referenced, cause 409.
- ✓
The resource already exists and the request attempts to create a duplicate.
Why this is correct
Creating a duplicate resource is a typical cause of 409.
- ✗
The resource does not exist.
Why it's wrong here
A missing resource would give 404, not 409.
- ✗
The request contains invalid data types.
Why it's wrong here
Invalid data types result in 400 Bad Request.
Visual reference
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Last reviewed: Jun 24, 2026
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