Quick Answer
The answer is App Service Authentication, commonly known as Easy Auth, configured with Microsoft Entra ID. This is the correct choice because Easy Auth operates at the App Service platform layer, intercepting all incoming HTTP requests before they reach your Azure Function code. By setting the 'Action to take when request is not authenticated' to either 'Log in with Microsoft Entra ID' or 'Return HTTP 401 Unauthorized', the platform rejects unauthenticated calls immediately, ensuring your function trigger code never executes for unauthorized users. On the AZ-204 exam, this scenario tests your understanding of authentication enforcement boundaries—many candidates mistakenly try to implement authentication inside the function code using middleware or custom logic, but the platform-level rejection is both simpler and more secure. A common trap is confusing Easy Auth with function-level authorization keys, which only protect the function endpoint, not the underlying App Service. Memory tip: think "Easy Auth = Early Auth"—it blocks bad requests before your code even wakes up.
This AZ-204 practice question tests your understanding of develop azure compute solutions. 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.
A booking backend uses Azure Functions with HTTP triggers. The developer wants to reject unauthenticated calls before function code executes. Which feature should be configured?
Application Insights sampling
Why wrong: Sampling controls telemetry volume, not authentication.
App Service Authentication / Easy Auth with Microsoft Entra ID
Built-in authentication validates requests before they reach application code.
Deployment slots
Why wrong: Slots control deployment stages, not request authentication.
Function timeout
Why wrong: Timeout controls execution duration, not caller identity.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
App Service Authentication / Easy Auth with Microsoft Entra ID
App Service Authentication (Easy Auth) with Microsoft Entra ID allows the developer to reject unauthenticated calls before the function code executes by configuring the 'Action to take when request is not authenticated' to 'Log in with Microsoft Entra ID' or 'Return HTTP 401 Unauthorized'. This is enforced at the App Service platform layer, meaning the function trigger code never runs for unauthenticated requests, which is exactly the requirement.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Application Insights sampling
Why it's wrong here
Sampling controls telemetry volume, not authentication.
App Service Authentication / Easy Auth with Microsoft Entra ID
Why this is correct
Built-in authentication validates requests before they reach application code.
Related concept
Read the scenario before looking for a memorised answer.
Deployment slots
Why it's wrong here
Slots control deployment stages, not request authentication.
Function timeout
Why it's wrong here
Timeout controls execution duration, not caller identity.
Common exam traps
The trap here is that candidates may think authentication must be handled inside the function code using attributes like [Authorize] or manual token validation, overlooking the platform-level Easy Auth feature that rejects calls before any code runs.
Detailed technical explanation
Under the hood, Easy Auth intercepts all incoming HTTP requests at the App Service front-end (the same layer that handles TLS termination and load balancing) before they reach the function runtime. It validates the OAuth 2.0 bearer token from Microsoft Entra ID, and if the token is missing or invalid, it immediately returns a 401 response without invoking the function host process. This is particularly useful for reducing cold-start costs and preventing unauthorized resource consumption in Consumption-plan functions.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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Develop Azure compute solutions — study guide chapter
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FAQ
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
The correct answer is: App Service Authentication / Easy Auth with Microsoft Entra ID — App Service Authentication (Easy Auth) with Microsoft Entra ID allows the developer to reject unauthenticated calls before the function code executes by configuring the 'Action to take when request is not authenticated' to 'Log in with Microsoft Entra ID' or 'Return HTTP 401 Unauthorized'. This is enforced at the App Service platform layer, meaning the function trigger code never runs for unauthenticated requests, which is exactly the requirement.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 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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