- A
In the frontend app registration, grant API permissions for the backend using the 'Delegated permissions' type. In the backend app registration, expose an API scope. The frontend uses the on-behalf-of flow (OBO) to exchange the user's token for a token to call the backend.
OBO flow allows the frontend to act on behalf of the user.
- B
In the frontend app registration, enable the implicit grant flow for access tokens. The frontend gets a token for the backend directly from the authorization endpoint.
Why wrong: Implicit grant is deprecated and not recommended for this scenario.
- C
In the frontend app registration, set the redirect URI to the backend URL. The frontend uses the authorization code flow to get a token for the backend directly.
Why wrong: The authorization code flow gives the frontend a token for itself, not for the backend.
- D
In the frontend app registration, grant API permissions for the backend using the 'Application permissions' type. In the backend app registration, expose an API scope. The frontend uses the client credentials flow to get a token for the backend.
Why wrong: Client credentials flow does not include the user's identity; it's for daemon apps.
AZ-204 Implement Azure security Practice Question
This AZ-204 practice question tests your understanding of implement azure security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
You are deploying a multi-tier application: a frontend web app (Azure App Service) that calls a backend API (another Azure App Service). Both apps use Microsoft Entra ID for authentication. The frontend needs to authenticate to the backend on behalf of the signed-in user. You need to configure the OAuth 2.0 flow correctly. You have already registered both applications in Microsoft Entra ID. Which configuration should you apply?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
In the frontend app registration, grant API permissions for the backend using the 'Delegated permissions' type. In the backend app registration, expose an API scope. The frontend uses the on-behalf-of flow (OBO) to exchange the user's token for a token to call the backend.
Option B is correct because the on-behalf-of flow (OBO) is designed for this scenario: the frontend receives a token for the user, then exchanges it for a token to call the backend. This requires exposing an API in the backend app registration and granting API permissions from the frontend. Option A is wrong because the client credentials flow is for non-interactive scenarios, not on behalf of a user. Option C is wrong because the authorization code flow alone does not allow the frontend to pass the user's identity to the backend. Option D is wrong because the implicit grant flow is deprecated.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
In the frontend app registration, grant API permissions for the backend using the 'Delegated permissions' type. In the backend app registration, expose an API scope. The frontend uses the on-behalf-of flow (OBO) to exchange the user's token for a token to call the backend.
Why this is correct
OBO flow allows the frontend to act on behalf of the user.
Related concept
Authentication checks who the user is.
- ✗
In the frontend app registration, enable the implicit grant flow for access tokens. The frontend gets a token for the backend directly from the authorization endpoint.
Why it's wrong here
Implicit grant is deprecated and not recommended for this scenario.
- ✗
In the frontend app registration, set the redirect URI to the backend URL. The frontend uses the authorization code flow to get a token for the backend directly.
Why it's wrong here
The authorization code flow gives the frontend a token for itself, not for the backend.
- ✗
In the frontend app registration, grant API permissions for the backend using the 'Application permissions' type. In the backend app registration, expose an API scope. The frontend uses the client credentials flow to get a token for the backend.
Why it's wrong here
Client credentials flow does not include the user's identity; it's for daemon apps.
Common exam traps
Common exam trap: authentication is not authorization
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.
Trap categories for this question
Scenario analysis trap
Implicit grant is deprecated and not recommended for this scenario.
Detailed technical explanation
How to think about this question
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.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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.
- →
Implement Azure security — study guide chapter
Learn the concepts, then practise the questions
- →
Implement Azure security practice questions
Targeted practice on this topic area only
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FAQ
Questions learners often ask
What does this AZ-204 question test?
Implement Azure security — This question tests Implement Azure security — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: In the frontend app registration, grant API permissions for the backend using the 'Delegated permissions' type. In the backend app registration, expose an API scope. The frontend uses the on-behalf-of flow (OBO) to exchange the user's token for a token to call the backend. — Option B is correct because the on-behalf-of flow (OBO) is designed for this scenario: the frontend receives a token for the user, then exchanges it for a token to call the backend. This requires exposing an API in the backend app registration and granting API permissions from the frontend. Option A is wrong because the client credentials flow is for non-interactive scenarios, not on behalf of a user. Option C is wrong because the authorization code flow alone does not allow the frontend to pass the user's identity to the backend. Option D is wrong because the implicit grant flow is deprecated.
What should I do if I get this AZ-204 question wrong?
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.
What is the key concept behind this question?
Authentication checks who the user is.
About these practice questions
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Last reviewed: Jun 20, 2026
This AZ-204 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-204 exam.
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