200-901 Infrastructure and Automation Practice Question
This 200-901 practice question tests your understanding of infrastructure and automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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'.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
Cisco DNA Center's REST API uses OpenAPI/Swagger specifications to define required fields for each endpoint. When a POST request to /dna/intent/api/v1/network-device is made, the server validates the JSON body against the schema; if 'ipAddress' is missing, it returns a 400 status with a 'missingParameters' array. This validation occurs before any business logic (like duplicate IP checks) is executed, ensuring data integrity early in the request lifecycle.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 200-901 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Infrastructure and Automation — This question tests Infrastructure and Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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