The correct answer is to add an Event Grid subscription to the blob storage. This eliminates polling by enabling an event-driven architecture where the Logic App is triggered instantly when a new blob is created, rather than checking the container every minute. Event Grid acts as a highly scalable, low-latency event router that pushes the event to the Logic App endpoint, reducing delay from up to 60 seconds to near real-time. On the AZ-204 exam, this scenario tests your understanding of event-based versus polling-based integrations, a common trap being the temptation to simply increase polling frequency (which still wastes compute and fails to achieve true low latency). Remember the key distinction: polling is pull-based and wasteful; Event Grid is push-based and efficient. A useful memory tip is “Push, don’t pull” — Event Grid pushes events, while polling pulls data, and the exam rewards the push approach for latency-sensitive solutions.
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. 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. 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 company integrates an Azure Logic App with Microsoft Teams to send notifications when a new file is added to an Azure Blob storage container. The Logic App currently polls the blob container every minute. They want to reduce latency and avoid polling. What should they do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add an Event Grid subscription to the blob storage.
Using an Event Grid subscription (option B) triggers the Logic App on blob creation events, eliminating polling. Option A increases frequency but still polls. Option C uses Service Bus which adds overhead. Option D is for data factory, not Logic Apps.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Increase the polling frequency to every 10 seconds.
Why it's wrong here
Still polling; event-driven is better.
✓
Add an Event Grid subscription to the blob storage.
Why this is correct
Event Grid pushes events to Logic App, eliminating polling.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use Azure Data Factory to monitor the storage.
Why it's wrong here
Data Factory is for data movement, not event-driven notifications.
✗
Use Azure Service Bus topics for file notifications.
Why it's wrong here
Adds unnecessary complexity; Event Grid is simpler.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-204 NAT questions on configuration and troubleshooting.
Connect to and consume Azure services and third-party services — This question tests Connect to and consume Azure services and third-party services — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Add an Event Grid subscription to the blob storage. — Using an Event Grid subscription (option B) triggers the Logic App on blob creation events, eliminating polling. Option A increases frequency but still polls. Option C uses Service Bus which adds overhead. Option D is for data factory, not Logic Apps.
What should I do if I get this AZ-204 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related AZ-204 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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