- A
IP address filtering to allow only the Azure Event Grid service tag
Why wrong: 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
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
Require a client certificate that you upload to Event Grid
Why wrong: Event Grid does not support client certificate authentication for webhook endpoints.
- D
Use an OAuth 2.0 token from Microsoft Entra ID
Why wrong: Event Grid does not use OAuth tokens when delivering events to webhooks; it uses shared access key validation.
Quick Answer
The answer is to validate the Aeg-SasKey header against a shared secret known to Event Grid. This works because when Event Grid delivers events to a custom webhook endpoint, it includes the Aeg-SasKey header, which is a hash-based message authentication code (HMAC) derived from the endpoint’s shared access key. By comparing this header value against a locally computed HMAC using the same secret, your webhook can cryptographically confirm that the request genuinely came from Event Grid, blocking any unauthorized invocations. On the AZ-204 exam, this scenario tests your understanding of Event Grid webhook security, often appearing as a distractor where candidates mistakenly choose IP restrictions or Azure AD authentication—but those do not validate the origin of the event. A common trap is assuming the Aeg-SasKey header is optional; in reality, it is mandatory for custom endpoints. Memory tip: think “Aeg-SasKey = Event Grid’s signature stamp,” ensuring only the grid can knock on your webhook’s door.
AZ-204 Practice Question: Connect to and consume Azure services and third-party services
This AZ-204 practice question tests your understanding of connect to and consume azure services and third-party services. 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 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?
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
Validate the Aeg-SasKey header against a shared secret known to Event Grid
Option B is correct because Event Grid sends an Aeg-SasKey header with each request to a custom webhook endpoint. By validating this header against a pre-configured shared secret (the same key used when creating the event subscription), the endpoint can confirm that the request originated from Event Grid. This prevents unauthorized actors from invoking the webhook, as they would not possess the shared secret.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
IP address filtering to allow only the Azure Event Grid service tag
Why it's wrong here
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.
- ✓
Validate the Aeg-SasKey header against a shared secret known to Event Grid
Why this is correct
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Require a client certificate that you upload to Event Grid
Why it's wrong here
Event Grid does not support client certificate authentication for webhook endpoints.
- ✗
Use an OAuth 2.0 token from Microsoft Entra ID
Why it's wrong here
Event Grid does not use OAuth tokens when delivering events to webhooks; it uses shared access key validation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume IP whitelisting (Option A) is sufficient for security, but Event Grid's outbound IPs are not static or documented for custom webhooks, making this approach unreliable and unsupported.
Detailed technical explanation
How to think about this question
When you create an event subscription with a custom webhook endpoint, Event Grid generates a shared access signature (SAS) key. This key is included as the Aeg-SasKey header in every HTTP POST request to the endpoint. The endpoint must extract this header and compare it against the expected key (e.g., stored in application settings) to validate the request. This is a form of symmetric key authentication, similar to how Azure Storage uses SAS tokens, but specifically designed for Event Grid's push delivery model.
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.
TExam Day Tips
- 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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this AZ-204 question test?
Connect to and consume Azure services and third-party services — This question tests Connect to and consume Azure services and third-party services — 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 — Option B is correct because Event Grid sends an Aeg-SasKey header with each request to a custom webhook endpoint. By validating this header against a pre-configured shared secret (the same key used when creating the event subscription), the endpoint can confirm that the request originated from Event Grid. This prevents unauthorized actors from invoking the webhook, as they would not possess the shared secret.
What should I do if I get this AZ-204 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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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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