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200-901 Infrastructure and Automation Practice Question

Exhibit

Refer to the exhibit.

POST /api/v1/vlan HTTP/1.1
Host: 192.168.1.100
Authorization: Bearer <token>
Content-Type: application/json

{
    "name": "Engineering",
    "vlanId": 10
}

A Python script sends the above REST API request to a Cisco Catalyst 9000 switch running IOS XE. The response is a 400 Bad Request. Which field is most likely missing from the JSON payload?

⚠ Common exam trap

Cisco often tests the distinction between the `interface` field (the actual interface identifier) and the `name` field (which is not used in this API), leading candidates to incorrectly choose `name` as the missing field.

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

✓

interface

The REST API request is targeting the creation of a network interface on a Cisco Catalyst 9000 switch running IOS XE. The 400 Bad Request indicates a missing required field in the JSON payload. According to the Cisco IOS XE REST API documentation for the `/api/v1/interface` endpoint, the `interface` field (which specifies the interface name, e.g., 'GigabitEthernet1/0/1') is mandatory when creating a new interface. Without it, the API cannot determine which interface to configure, resulting in a 400 error.

Answer analysis

Option-by-option breakdown

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

✗
vlanId
Why it's wrong here
The payload includes 'vlanId'.
✗
description
Why it's wrong here
Description is optional; its absence would not cause a 400.
✓
interface
Why this is correct
For VLAN creation, a mandatory 'interface' field (e.g., port membership) or 'vlanType' is required.
✗
name
Why it's wrong here
The payload includes 'name'.

Go deeper

200-901 Infrastructure and Automation Practice Question

Exhibit

Why each option matters

Option-by-option breakdown

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