200-901 Infrastructure and Automation Practice Question
Exhibit
{"error":{"code":400,"message":"Invalid request: missing required parameter 'ipAddress'","details":null}}Refer to the exhibit. A developer receives this response when making a POST request to the Cisco DNA Center API to create a new device. What is the most likely issue?
⚠ Common exam trap
Cisco often tests the ability to read API error responses carefully, where candidates might overlook the 'missingParameters' field and incorrectly assume a token or endpoint issue instead of a missing required 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
✓
The request body is missing the required field 'ipAddress'.
The error response includes a field 'missingParameters' with the value 'ipAddress', which explicitly indicates that the request body did not include the required 'ipAddress' field. Cisco DNA Center's API for device creation requires this field to identify the device on the network. Without it, the API cannot proceed with adding the device, resulting in a 400 Bad Request.
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 request body is missing the required field 'ipAddress'.
Why this is correct
Cisco DNA Center validates the JSON payload against its schema, and a missing mandatory attribute such as ipAddress triggers a 400 error naming that field. The response therefore indicates the body omitted a required property rather than an authentication or endpoint fault.
- ✗
The API endpoint is incorrect.
Why it's wrong here
An incorrect endpoint yields HTTP 404 Not Found, whereas the exhibit shows an authorisation-related status. It tempts because mistyped URLs are a frequent developer mistake, but the endpoint clearly resolved and processed the request, so the failure lies in credentials or permissions rather than the path.
- ✗
The device IP address is already in use.
Why it's wrong here
A duplicate IP would typically return a conflict or validation error, not the authorisation failure shown in the exhibit. It tempts because duplicate device entries are a genuine DNA Center concern, but the response indicates the request was rejected before device state was evaluated, so address reuse is not the cause.
- ✗
The API token has expired.
Why it's wrong here
An expired token produces HTTP 401 Unauthorised, but the exhibit returns 403 Forbidden, meaning the token authenticated successfully yet lacks the required role or permission. It tempts because token expiry is a common API failure, yet the status code distinguishes authentication failure from authorisation denial.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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