The answer is Azure Event Grid, which provides a serverless event routing service that connects event sources to event handlers. This service operates on a publish-subscribe model, where event sources like Azure Blob Storage or resource groups publish events, and handlers such as Azure Functions or webhooks subscribe to receive them, all without requiring any polling or custom infrastructure. On the Microsoft Azure Fundamentals AZ-900 exam, this question tests your understanding of how Azure enables reactive, event-driven architectures, often contrasting Event Grid with other messaging services like Event Hubs or Service Bus. A common trap is confusing Event Grid’s lightweight, serverless routing with Event Hubs’ big data streaming or Service Bus’s enterprise messaging; remember that Event Grid is specifically for discrete, high-frequency events between many sources and handlers. A helpful memory tip: think “Grid” as a net that catches events and instantly delivers them to waiting handlers, like a lightning-fast postal service for cloud events.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and 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.
Which Azure service provides a serverless event routing service that connects event sources to event handlers?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Event Grid
Azure Event Grid is a fully managed serverless event routing service that uses a publish-subscribe model to connect event sources (e.g., Azure Blob Storage, resource groups) to event handlers (e.g., Azure Functions, webhooks). It filters and routes events based on event types and subscriptions, enabling reactive programming without polling or custom infrastructure.
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.
✗
Azure Service Bus
Why it's wrong here
Service Bus is a message broker for reliable enterprise messaging; Event Grid is for event routing.
✗
Azure Event Hubs
Why it's wrong here
Event Hubs ingests high-volume streaming events; Event Grid routes events from sources to handlers.
✓
Azure Event Grid
Why this is correct
Event Grid routes events from sources to handlers with filtering, fan-out, and serverless delivery.
Related concept
Read the scenario before looking for a memorised answer.
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse event routing (Event Grid) with message queuing (Service Bus) or data streaming (Event Hubs), but Event Grid is specifically designed for serverless, reactive event distribution without polling or managing queues.
Detailed technical explanation
How to think about this question
Under the hood, Azure Event Grid uses an event schema based on CloudEvents 1.0, with support for custom events and advanced filtering (e.g., by subject, event type, or data fields). It guarantees at-least-once delivery with a 24-hour retry window and dead-lettering for failed deliveries, making it ideal for scenarios like automating infrastructure responses (e.g., triggering a function when a VM is created) or integrating third-party SaaS events.
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-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Azure Event Grid — Azure Event Grid is a fully managed serverless event routing service that uses a publish-subscribe model to connect event sources (e.g., Azure Blob Storage, resource groups) to event handlers (e.g., Azure Functions, webhooks). It filters and routes events based on event types and subscriptions, enabling reactive programming without polling or custom infrastructure.
What should I do if I get this AZ-900 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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