- A
Set the trigger's 'source' parameter to 'EventGrid' and filter events by the 'content-type' property.
Correct. By setting the trigger source to EventGrid and filtering events by the 'content-type' property (e.g., 'image/jpeg', 'image/png'), the function only triggers for image blobs, avoiding unnecessary invocations for other file types.
- B
Set the trigger's 'filter' property to '*.jpg,*.png'.
Why wrong: Incorrect. Azure Blob Storage triggers do not support a 'filter' property like '*.jpg,*.png'. This is not a valid configuration option.
- C
Implement the function without filtering and check the content type inside the function, ignoring non-image blobs.
Correct. While this approach invokes the function for every blob, checking the content type inside the function and ignoring non-image blobs is a straightforward and valid method to only process images.
- D
Use the blob trigger with a path pattern like 'images/{name}.jpg' and 'images/{name}.png' and use the extension binding to filter.
Why wrong: Incorrect. The blob trigger's path pattern (e.g., 'images/{name}.jpg') is used to bind the blob name, but it does not filter the trigger. The function will fire for any blob created in the container, regardless of the extension.
AZ-204 Event Grid Trigger Practice Question
This AZ-204 practice question tests your understanding of develop for azure storage. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. A key principle to apply: event Grid Trigger. 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 developing a web application that allows users to upload profile pictures to Azure Blob Storage. The application generates thumbnails using an Azure Function that is triggered by blob creation. You need to ensure that the function only processes image files and ignores other file types. What should you do?
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
Set the trigger's 'source' parameter to 'EventGrid' and filter events by the 'content-type' property.
Both options A and C are valid methods to ensure the Azure Function only processes image files. Option A uses an Event Grid trigger with filtering on the 'content-type' property, which allows the function to only run for blobs with image content types. Option C checks the content type inside the function and ignores non-image blobs, which also works but runs the function for all blobs. Option B is incorrect because blob triggers do not have a 'filter' property for extensions. Option D is incorrect because the blob trigger's path pattern does not filter by extension; the function triggers for any blob in the container regardless of the file extension.
Key principle: Event Grid Trigger
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Set the trigger's 'source' parameter to 'EventGrid' and filter events by the 'content-type' property.
Why this is correct
Correct. By setting the trigger source to EventGrid and filtering events by the 'content-type' property (e.g., 'image/jpeg', 'image/png'), the function only triggers for image blobs, avoiding unnecessary invocations for other file types.
Related concept
Event Grid Trigger
- ✗
Set the trigger's 'filter' property to '*.jpg,*.png'.
Why it's wrong here
Incorrect. Azure Blob Storage triggers do not support a 'filter' property like '*.jpg,*.png'. This is not a valid configuration option.
- ✓
Implement the function without filtering and check the content type inside the function, ignoring non-image blobs.
Why this is correct
Correct. While this approach invokes the function for every blob, checking the content type inside the function and ignoring non-image blobs is a straightforward and valid method to only process images.
Related concept
Event Grid Trigger
- ✗
Use the blob trigger with a path pattern like 'images/{name}.jpg' and 'images/{name}.png' and use the extension binding to filter.
Why it's wrong here
Incorrect. The blob trigger's path pattern (e.g., 'images/{name}.jpg') is used to bind the blob name, but it does not filter the trigger. The function will fire for any blob created in the container, regardless of the extension.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often mistakenly believe that blob trigger path patterns can filter by file extension (Option D), but in reality, the trigger fires for any blob in the container regardless of the pattern. The correct approaches are either using Event Grid trigger with content-type filtering or checking the content type inside the function.
Detailed technical explanation
How to think about this question
Under the hood, the Blob trigger uses an Azure Storage queue to monitor blob creation events; the path pattern is evaluated at the trigger level before the function is invoked, meaning non-matching blobs never trigger the function, reducing cold starts and costs. A subtle behavior is that the pattern 'images/{name}.jpg' matches blobs with exactly that extension, but it does not support multiple extensions in a single binding; you must create separate function bindings or use a single pattern like 'images/{name}.{ext}' and then check the extension inside the function if you need to handle multiple types. In a real-world scenario, using path filtering is critical for high-throughput systems where processing every blob creation event would overwhelm the function or incur unnecessary costs.
KKey Concepts to Remember
- Event Grid Trigger
- Blob Trigger Limitations
- Content Type Filtering
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
Event Grid Trigger
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
Azure Blob Storage Tier Comparison
| Tier | Storage Cost | Retrieval Cost | Latency | Use Case |
|---|---|---|---|---|
| Hot | Highest | Lowest | Immediate | Active data, frequent reads |
| Cool | Lower | Higher | Immediate | Data accessed < once / month |
| Cold | Lower still | Higher | Immediate | Data accessed < once / quarter |
| Archive | Lowest | Highest + rehydration delay | Hours | Long-term compliance retention |
What to study next
Got this wrong? Here's your next step.
Review event Grid Trigger, then practise related AZ-204 questions on the same topic to reinforce the concept.
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Develop for Azure storage — study guide chapter
Learn the concepts, then practise the questions
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Develop for Azure storage practice 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?
Develop for Azure storage — This question tests Develop for Azure storage — Event Grid Trigger.
What is the correct answer to this question?
The correct answer is: Set the trigger's 'source' parameter to 'EventGrid' and filter events by the 'content-type' property. — Both options A and C are valid methods to ensure the Azure Function only processes image files. Option A uses an Event Grid trigger with filtering on the 'content-type' property, which allows the function to only run for blobs with image content types. Option C checks the content type inside the function and ignores non-image blobs, which also works but runs the function for all blobs. Option B is incorrect because blob triggers do not have a 'filter' property for extensions. Option D is incorrect because the blob trigger's path pattern does not filter by extension; the function triggers for any blob in the container regardless of the file extension.
What should I do if I get this AZ-204 question wrong?
Review event Grid Trigger, then practise related AZ-204 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Event Grid Trigger
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Last reviewed: Jun 24, 2026
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