The answer is the "When a blob is created or modified (blob trigger)" because it is the native Azure Logic Apps trigger that subscribes to Blob Storage events, automatically firing your serverless workflow whenever a new blob is uploaded or an existing blob is modified in a specified container. This trigger leverages an event subscription under the hood, making it the correct choice for event-driven workflows that must respond to blob uploads without polling. On the AZ-204 exam, this question tests your understanding of how Logic Apps integrates with Azure Storage events, often appearing alongside traps like the HTTP trigger or a recurrence-based polling trigger—both of which lack the native event-driven efficiency. A common memory tip is to associate "blob trigger" with "event-driven uploads": if you need a workflow to start the instant a blob lands in storage, the blob trigger is your automatic, native hook.
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 a serverless workflow using Azure Logic Apps. The workflow must start when a new blob is uploaded to a specific container in Azure Blob Storage. Which trigger should you configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
When a blob is created or modified (blob trigger)
Option A is correct because the 'When a blob is created or modified (blob trigger)' is the native Azure Logic Apps trigger designed to start a workflow automatically when a new blob is uploaded or an existing blob is modified in a specified Azure Blob Storage container. This trigger uses the Azure Blob Storage event subscription to detect changes and is the appropriate choice for event-driven serverless workflows that respond to blob storage events.
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.
✓
When a blob is created or modified (blob trigger)
Why this is correct
This trigger monitors a blob storage container and fires when a new blob is added or an existing blob is updated.
Related concept
Read the scenario before looking for a memorised answer.
✗
HTTP request trigger
Why it's wrong here
HTTP request trigger requires an incoming HTTP call; it does not automatically poll for blob changes.
✗
Recurrence trigger
Why it's wrong here
Recurrence trigger runs the workflow on a scheduled interval, not in response to blob events.
✗
Service Bus trigger
Why it's wrong here
Service Bus trigger reacts to messages in a queue or topic, not to blob storage events.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the Blob Storage trigger with the HTTP trigger, thinking they can manually invoke the workflow via a URL, but the question specifically requires an event-driven start from a blob upload, which only the blob trigger supports.
Detailed technical explanation
How to think about this question
Under the hood, the 'When a blob is created or modified' trigger in Logic Apps leverages Azure Event Grid to subscribe to blob storage events, ensuring near-real-time execution with low latency. This trigger supports filtering by blob path and can handle concurrent uploads efficiently, making it ideal for scenarios like processing uploaded images or triggering data pipelines. A subtle behavior is that the trigger may not fire for blobs uploaded via certain SDKs if the blob is created with a lease or if the storage account has hierarchical namespace enabled (Data Lake Storage Gen2).
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
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: When a blob is created or modified (blob trigger) — Option A is correct because the 'When a blob is created or modified (blob trigger)' is the native Azure Logic Apps trigger designed to start a workflow automatically when a new blob is uploaded or an existing blob is modified in a specified Azure Blob Storage container. This trigger uses the Azure Blob Storage event subscription to detect changes and is the appropriate choice for event-driven serverless workflows that respond to blob storage events.
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.
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Question Discussion
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