200-901 Understanding and Using APIs Practice Question
This 200-901 practice question tests your understanding of understanding and using apis. 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.
An application authenticates to Cisco Webex API using OAuth2 client credentials grant. Which three pieces of information must the application include in the token request?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Client ID
In the OAuth2 client credentials grant flow, the application authenticates directly as itself (not on behalf of a user) to obtain an access token. The token request must include the client ID (B) to identify the application, the client secret (D) to prove its identity, and the grant type (E) set to 'client_credentials' to indicate the flow being used. These three fields are mandatory per RFC 6749 Section 4.4.2.
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.
✗
Authorization Code
Why it's wrong here
An authorization code is used in the authorization code grant, not in the client credentials grant.
✓
Client ID
Why this is correct
The client ID identifies the application to the authorization server.
Related concept
Read the scenario before looking for a memorised answer.
✗
Redirect URI
Why it's wrong here
Redirect URI is used in the authorization code grant for the initial step, not in client credentials.
✓
Client Secret
Why this is correct
The client secret is used to authenticate the application.
Related concept
Read the scenario before looking for a memorised answer.
✓
Grant Type
Why this is correct
The grant type must be set to 'client_credentials' for this flow.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between OAuth2 grant types, and the trap here is that candidates confuse the client credentials grant with the authorization code grant, incorrectly assuming an authorization code or redirect URI is always required for any OAuth2 token request.
Detailed technical explanation
How to think about this question
Under the hood, the client credentials grant uses HTTP POST to the token endpoint (e.g., https://webexapis.com/v1/access_token) with a Content-Type of application/x-www-form-urlencoded. The grant_type parameter must be exactly 'client_credentials', and the client_id and client_secret are typically sent in the request body, though some implementations also support HTTP Basic Authentication. A real-world scenario is a backend service that needs to provision Webex users or manage rooms without any interactive user login, making this flow ideal for server-to-server automation.
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.
Understanding and Using APIs — This question tests Understanding and Using APIs — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Client ID — In the OAuth2 client credentials grant flow, the application authenticates directly as itself (not on behalf of a user) to obtain an access token. The token request must include the client ID (B) to identify the application, the client secret (D) to prove its identity, and the grant type (E) set to 'client_credentials' to indicate the flow being used. These three fields are mandatory per RFC 6749 Section 4.4.2.
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.
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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