- A
Remove the client secret from the app registration and configure the application to use a client certificate for authentication. Set the application type to 'Public client/native' and disable 'Allow public client flows' (if needed).
Removing the secret eliminates the compromised secret. Using a certificate ensures secure authentication, and setting as public client (with PKCE) prevents use of client secrets.
- B
Keep the client secret but enable 'Allow public client flows' and set the redirect URI to use a custom scheme.
Why wrong: Allowing public client flows does not prevent client secret misuse; the secret can still be used.
- C
Change the authentication flow to client credentials grant and assign a managed identity to the application.
Why wrong: Client credentials grant does not involve user interaction, violating the requirement.
- D
Increase the client secret expiration to 2 years and rotate the secret monthly.
Why wrong: This does not prevent misuse of the current secret; it just rotates it.
Quick Answer
The correct answer is to remove the client secret from the app registration and configure the application to use a client certificate for authentication, while setting the application type to public client and disabling 'Allow public client flows' if needed. This works because by eliminating the shared secret and replacing it with a certificate-based client assertion, you effectively mitigate OAuth client secret theft using certificate in PKCE flow; the certificate acts as a cryptographic proof of identity that cannot be easily stolen or reused like a static string. On the AZ-204 exam, this scenario tests your understanding of how to enforce interactive user authentication only—the trap is confusing public client settings with confidential client credentials, but remember that PKCE already protects the authorization code, so the real vulnerability here is the client secret itself. A simple memory tip: "No secret, no theft—certificate is the key."
AZ-204 Implement Azure security Practice Question
This AZ-204 practice question tests your understanding of implement azure security. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 a security engineer for a large enterprise that uses Microsoft Entra ID. The company deploys a custom web application in Azure that authenticates users via the OAuth 2.0 authorization code flow with PKCE. The application is registered in Microsoft Entra ID. Recently, security auditors discovered that a compromised client secret was used to obtain tokens without user consent. You must update the application registration to prevent this type of attack. The application should still work with the authorization code flow and PKCE. You need to ensure that only interactive user authentication can obtain tokens, and that client secrets cannot be used to request tokens directly. Which option meets these requirements?
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
Remove the client secret from the app registration and configure the application to use a client certificate for authentication. Set the application type to 'Public client/native' and disable 'Allow public client flows' (if needed).
Option A is correct: By disabling the 'Allow public client flows' setting and removing the client secret, the application becomes a confidential client that still uses the authorization code flow, but the client secret is not used because PKCE with client assertion (certificate) replaces it. However, the key point is to prevent client secret misuse. In Microsoft Entra ID, you can mark the application as a public client (which disables client secrets) or use client certificates instead. Option A describes removing the secret and using a certificate, which ensures that only interactive flows (which require user authentication) are possible. Option B is incorrect because enabling 'Allow public client flows' would allow non-interactive flows. Option C is incorrect because using client credentials grant is for non-interactive scenarios. Option D is incorrect because adjusting token lifetime does not prevent client secret misuse.
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.
- ✓
Remove the client secret from the app registration and configure the application to use a client certificate for authentication. Set the application type to 'Public client/native' and disable 'Allow public client flows' (if needed).
Why this is correct
Removing the secret eliminates the compromised secret. Using a certificate ensures secure authentication, and setting as public client (with PKCE) prevents use of client secrets.
Related concept
Authentication checks who the user is.
- ✗
Keep the client secret but enable 'Allow public client flows' and set the redirect URI to use a custom scheme.
Why it's wrong here
Allowing public client flows does not prevent client secret misuse; the secret can still be used.
- ✗
Change the authentication flow to client credentials grant and assign a managed identity to the application.
Why it's wrong here
Client credentials grant does not involve user interaction, violating the requirement.
- ✗
Increase the client secret expiration to 2 years and rotate the secret monthly.
Why it's wrong here
This does not prevent misuse of the current secret; it just rotates it.
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.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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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All AZ-204 questions
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Microsoft Azure Developer Associate AZ-204 study guide
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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: Remove the client secret from the app registration and configure the application to use a client certificate for authentication. Set the application type to 'Public client/native' and disable 'Allow public client flows' (if needed). — Option A is correct: By disabling the 'Allow public client flows' setting and removing the client secret, the application becomes a confidential client that still uses the authorization code flow, but the client secret is not used because PKCE with client assertion (certificate) replaces it. However, the key point is to prevent client secret misuse. In Microsoft Entra ID, you can mark the application as a public client (which disables client secrets) or use client certificates instead. Option A describes removing the secret and using a certificate, which ensures that only interactive flows (which require user authentication) are possible. Option B is incorrect because enabling 'Allow public client flows' would allow non-interactive flows. Option C is incorrect because using client credentials grant is for non-interactive scenarios. Option D is incorrect because adjusting token lifetime does not prevent client secret misuse.
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.
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Last reviewed: Jun 21, 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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