Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
You are developing a web API hosted on Azure App Service. The API must authenticate requests using Microsoft Entra ID OAuth 2.0 bearer tokens. You want to validate the token in your ASP.NET Core API code with minimal custom validation logic. Which library should you use?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Microsoft Authentication Library (MSAL)
MSAL is used by client applications to acquire access tokens, not by APIs to validate incoming tokens.
B
Distractor review
Azure Identity client library
Azure Identity is used for authenticating to Azure services (e.g., Key Vault, Storage) using managed identities or service principals, not for validating tokens in a web API.
C
Best answer
Microsoft.Identity.Web
This library is designed for ASP.NET Core and simplifies the integration with Microsoft Entra ID, including token validation, claims mapping, and authorization policies.
D
Distractor review
Azure Management Libraries for .NET
These libraries are used for programmatically managing Azure resources (create VMs, etc.), not for validating identity tokens.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
Related AZ-204 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
An application stores customer invoices in Azure Blob Storage. Deleted blobs must be recoverable for 14 days. What should be enabled?
Question 2
You are deploying a containerized application to Azure Container Instances. The application requires a custom domain name and SSL/TLS termination. You need to configure these features. Which resource should you create alongside the container group?
Question 3
A developer needs to run a Kusto query against application request data to identify 95th percentile latency by operation. Where should the query be run? The architecture review board prefers a managed AWS-native control.
Question 4
You are developing a web app that authenticates users via Microsoft Entra ID. The app needs to read the user's profile and send emails on their behalf. You want to minimize user consent prompts. Which OAuth 2.0 grant type should you use?
Question 5
You are developing an Azure Function that processes messages from an Azure Service Bus queue. The function uses a Service Bus queue trigger and runs on a Consumption Plan. The queue receives a high volume of messages in bursts. You need to ensure that the function scales out to handle the load but does not exceed 10 concurrent instances. Which configuration should you apply?
Question 6
You are monitoring an Azure App Service using Application Insights. You notice that the server response time is high for certain requests. You need to drill down to see which external dependencies (like databases or APIs) are causing the delay. Which Application Insights feature should you use?
FAQ
Questions learners often ask
What does this AZ-204 question test?
Authentication checks who the user is.
What is the correct answer to this question?
The correct answer is: Microsoft.Identity.Web — Microsoft.Identity.Web is a library built on top of MSAL.NET and is specifically designed for ASP.NET Core applications to integrate with Microsoft Entra ID. It provides easy token validation, policy-based authorization, and handles the complexities of token verification and caching. MSAL (Microsoft Authentication Library) is used for acquiring tokens, not validating them in an API. Azure Identity is used for credential-based authentication (DefaultAzureCredential, etc.) for connecting to Azure services. The Azure Management Libraries are for managing Azure resources, not for token validation in web APIs.
What should I do if I get this AZ-204 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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