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You are building an application that subscribes to an Azure Event Grid topic using a custom webhook endpoint. The endpoint is a web API hosted on Azure App Service. You need to ensure that only Event Grid can invoke your webhook endpoint, preventing unauthorized requests. What should you implement in your webhook endpoint?

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You are building an application that subscribes to an Azure Event Grid topic using a custom webhook endpoint. The endpoint is a web API hosted on Azure App Service. You need to ensure that only Event Grid can invoke your webhook endpoint, preventing unauthorized requests. What should you implement in your webhook endpoint?

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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

IP address filtering to allow only the Azure Event Grid service tag

Azure Event Grid IP ranges can change and are not a reliable way to uniquely identify Event Grid; also, the service tag is not a guarantee of authenticity.

B

Best answer

Validate the Aeg-SasKey header against a shared secret known to Event Grid

Event Grid includes the Aeg-SasKey header in every delivery, and your endpoint can verify it using the access key from the subscription to confirm the sender.

C

Distractor review

Require a client certificate that you upload to Event Grid

Event Grid does not support client certificate authentication for webhook endpoints.

D

Distractor review

Use an OAuth 2.0 token from Microsoft Entra ID

Event Grid does not use OAuth tokens when delivering events to webhooks; it uses shared access key validation.

Common exam trap

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Technical deep dive

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

KKey Concepts to Remember

  • Read the scenario before looking for a memorised answer.
  • Find the constraint that changes the correct option.
  • Eliminate answers that are true in general but not in this case.
  • Use explanations to understand the rule behind the answer.

TExam Day Tips

  • Underline the problem statement mentally.
  • Watch for words such as best, first, most likely and least administrative effort.
  • Review why wrong options are wrong, not only why the correct option is correct.

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.

AZ-204 fundamentals practice questions

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AZ-204 scenario practice questions

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AZ-204 troubleshooting practice questions

Practise AZ-204 questions linked to AZ-204 troubleshooting.

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

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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?

Read the scenario before looking for a memorised answer.

What is the correct answer to this question?

The correct answer is: Validate the Aeg-SasKey header against a shared secret known to Event Grid — Event Grid includes an Aeg-SasKey header in each delivery request. Your webhook should validate this header against the access key stored in the Event Grid subscription to verify the request came from the expected source. IP filtering alone is not reliable because Event Grid uses a dynamic IP range. Client certificates and OAuth are not supported by Event Grid for webhook delivery.

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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