The answer is that the access token only has the 'spark:rooms_read' scope. A 401 Unauthorized error in the Cisco Webex API does not always mean the token is expired; it often signals that the token lacks the required permissions for the requested operation. Creating a room demands a write-level scope like 'spark:rooms_write', so a token limited to read-only access is technically valid but insufficiently scoped, causing the API to reject the request. On the Cisco DevNet Associate 200-901 exam, this scenario tests your understanding of OAuth 2.0 scope granularity versus token expiry—a common trap where candidates assume a 401 always means the token has expired. Remember the memory tip: "Read can't write, so 401 is the plight."
200-901 Software Development and Design Practice Question
This 200-901 practice question tests your understanding of software development and design. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
A developer is using the Cisco Webex API to create a room and add members. The API requires an access token with the appropriate scopes. The developer receives a 401 Unauthorized error when trying to create a room. What is the most likely cause?
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 access token only has the 'spark:rooms_read' scope
The 401 Unauthorized error indicates that the request lacks valid authentication credentials. Since the developer is using an access token but still getting a 401, the most likely cause is that the token does not have the required scopes to perform the operation. The 'spark:rooms_read' scope only allows reading room details, not creating them, so the API rejects the request with a 401 because the token is valid but insufficiently scoped.
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 access token only has the 'spark:rooms_read' scope
Why this is correct
Correct: The write scope is required for creating rooms.
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 access token has the 'spark:memberships_write' scope but not 'spark:rooms_write'
Why it's wrong here
Incorrect: While lacking room write scope is an issue, the correct answer is C.
✗
The access token is not being sent in the Authorization header
Why it's wrong here
Incorrect: This would also cause 401, but the question implies the token is present.
✗
The access token has expired
Why it's wrong here
Incorrect: Expired tokens typically return 401, but the scope issue is more specific.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between 401 Unauthorized (authentication failure) and 403 Forbidden (authorization failure), and the trap here is that candidates assume a 401 always means a missing or expired token, when in fact an invalid scope can also trigger a 401 in Webex APIs.
Detailed technical explanation
How to think about this question
Cisco Webex REST APIs use OAuth 2.0 Bearer tokens for authentication, sent in the Authorization header as 'Bearer <token>'. The scopes are defined in the token's JWT payload and are validated against the endpoint's required permissions at the API gateway level. For room creation (POST /v1/rooms), the required scope is 'spark:rooms_write'; a token with only 'spark:rooms_read' will pass authentication but fail authorization, resulting in a 401 (not 403) due to the API's design treating insufficient scope as an authentication failure.
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
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.
Software Development and Design — This question tests Software Development and Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The access token only has the 'spark:rooms_read' scope — The 401 Unauthorized error indicates that the request lacks valid authentication credentials. Since the developer is using an access token but still getting a 401, the most likely cause is that the token does not have the required scopes to perform the operation. The 'spark:rooms_read' scope only allows reading room details, not creating them, so the API rejects the request with a 401 because the token is valid but insufficiently scoped.
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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