200-901 Cisco Platforms and Development Practice Question
This 200-901 practice question tests your understanding of cisco platforms and development. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Exhibit
Refer to the exhibit.
```json
{
"errorMessage": "Invalid auth token",
"statusCode": 401,
"details": "Token has expired"
}
```
Refer to the exhibit. A developer receives this response from Cisco DNA Center API. What is the most likely cause and solution?
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 token is expired; generate a new one using /dna/system/api/v1/auth/token.
The HTTP 401 Unauthorized response indicates that the request lacks valid authentication credentials. In Cisco DNA Center API, tokens are short-lived (default 1 hour) and must be refreshed via POST /dna/system/api/v1/auth/token. The error is not about the endpoint, body syntax, or RBAC permissions — it specifically means the token used is expired or invalid.
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 token is expired; generate a new one using /dna/system/api/v1/auth/token.
Why this is correct
Correct diagnosis and solution.
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 path is incorrect; verify the endpoint URL.
Why it's wrong here
Error does not mention path.
✗
The request body is malformed; check JSON syntax.
Why it's wrong here
Error does not mention body.
✗
The user does not have permission; request admin to grant access.
Why it's wrong here
Error specifies expired token, not permission.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between HTTP 401 (authentication failure) and 403 (authorization failure) — candidates confuse these two status codes, especially when the question involves API tokens.
Detailed technical explanation
How to think about this question
Cisco DNA Center uses OAuth 2.0 client credentials grant for API authentication. The token is a JWT (JSON Web Token) with an expiry claim (exp) typically set to 3600 seconds. The API gateway validates the token on every request; if expired, it immediately returns 401 without processing the request further. In production, developers must implement token refresh logic before expiry to avoid service disruption.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
Cisco Platforms and Development — This question tests Cisco Platforms and Development — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The token is expired; generate a new one using /dna/system/api/v1/auth/token. — The HTTP 401 Unauthorized response indicates that the request lacks valid authentication credentials. In Cisco DNA Center API, tokens are short-lived (default 1 hour) and must be refreshed via POST /dna/system/api/v1/auth/token. The error is not about the endpoint, body syntax, or RBAC permissions — it specifically means the token used is expired or invalid.
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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