This AZ-204 practice question tests your understanding of connect to and consume azure services and third-party services. 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.
Your web app needs to authenticate users with Microsoft Entra ID (formerly Azure AD). Which OAuth 2.0 flow should you use for a single-page application (SPA) that uses MSAL.js?
Client credentials flow
Why wrong: Used for server-to-server authentication, not user authentication.
Authorization code flow with PKCE
PKCE provides secure token exchange for SPAs.
Implicit flow
Why wrong: Implicit flow is deprecated due to security concerns.
Resource owner password credentials flow
Why wrong: Not recommended; exposes user credentials.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Authorization code flow with PKCE
The authorization code flow with PKCE is the recommended OAuth 2.0 flow for SPAs. Option B is wrong because implicit flow is deprecated. Option C is wrong because client credentials flow is for daemon apps. Option D is wrong because resource owner password credentials flow is not recommended.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Client credentials flow
Why it's wrong here
Used for server-to-server authentication, not user authentication.
Authorization code flow with PKCE
Why this is correct
PKCE provides secure token exchange for SPAs.
Related concept
Authentication checks who the user is.
Implicit flow
Why it's wrong here
Implicit flow is deprecated due to security concerns.
Resource owner password credentials flow
Why it's wrong here
Not recommended; exposes user credentials.
Common exam traps
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related AZ-204 questions on access control and AAA configuration.
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FAQ
Connect to and consume Azure services and third-party services — This question tests Connect to and consume Azure services and third-party services — Authentication checks who the user is..
The correct answer is: Authorization code flow with PKCE — The authorization code flow with PKCE is the recommended OAuth 2.0 flow for SPAs. Option B is wrong because implicit flow is deprecated. Option C is wrong because client credentials flow is for daemon apps. Option D is wrong because resource owner password credentials flow is not recommended.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related AZ-204 questions on access control and AAA configuration.
Authentication checks who the user is.
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Last reviewed: Jun 20, 2026
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