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
The error message clearly indicates the missing parameter 'ipAddress'.
- ✗
The API endpoint is incorrect.
Why it's wrong here
An incorrect endpoint would return a 404 Not Found error.
- ✗
The device IP address is already in use.
Why it's wrong here
A duplicate IP would result in a 409 Conflict error, not a 400.
- ✗
The API token has expired.
Why it's wrong here
An expired token results in a 401 Unauthorized error, not a 400 with this message.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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