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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

Switch VLAN 10 Sales (192.168.10.0/24) PC-A PC-B VLAN 20 HR (192.168.20.0/24) PC-C PC-D Router VLANs isolate traffic — inter-VLAN routing requires a Layer 3 device

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Last reviewed: Jun 24, 2026

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