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200-901 Infrastructure and Automation Practice Question

Exhibit

Refer to the exhibit.

{
  "ietf-interfaces:interface": {
    "name": "GigabitEthernet0/1",
    "description": "Link to Core",
    "type": "iana-if-type:ethernetCsmacd",
    "enabled": false,
    "ietf-ip:ipv4": {
      "address": [
        {
          "ip": "10.10.10.1",
          "netmask": "255.255.255.0"
        }
      ]
    }
  }
}

Refer to the exhibit. A Python script uses the YANG model to configure the interface. After applying this JSON payload via a PATCH request, what is the expected operational state of the interface?

⚠ Common exam trap

Cisco often tests the distinction between administrative state (controlled by the 'enabled' leaf) and operational state (which includes protocol status), and the trap here is that candidates may assume PATCH cannot modify administrative state or that the interface remains up if only a partial payload is sent.

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

✓

Administratively down

The PATCH request applies the provided JSON payload, which sets the interface's 'enabled' leaf to 'false' (or equivalent YANG leaf for administrative state). In YANG models for interfaces (e.g., RFC 8343 or Cisco native models), setting 'enabled' to false places the interface in an administratively down state. The PATCH operation is valid for modifying interface configuration, and the payload explicitly changes the administrative state to down, overriding any previous configuration.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Error because PATCH is not allowed on interfaces
Why it's wrong here
PATCH is allowed.
✗
No change, remains as previously configured
Why it's wrong here
PATCH applies the payload.
✓
Administratively down
Why this is correct
enabled: false sets admin down.
✗
Administratively up and protocol up
Why it's wrong here
Enabled false means administratively down.

Go deeper

200-901 Infrastructure and Automation Practice Question

Exhibit

Why each option matters

Option-by-option breakdown

Related to this question