The answer is Azure Functions, the serverless compute service that runs code in response to events without requiring you to provision or manage any underlying servers. This is correct because Azure Functions is built on an event-driven model where triggers—such as an HTTP request, a timer schedule, or an Azure service event like a new blob in storage—automatically invoke your code, and the platform handles all scaling and infrastructure. On the AZ-900 exam, this question tests your understanding of the core serverless compute options, often contrasting Azure Functions with Azure Logic Apps or Azure Container Instances; a common trap is confusing Functions with Logic Apps, but remember that Functions runs custom code (C#, JavaScript, Python) while Logic Apps is a workflow orchestrator. For a quick memory tip, think “Functions fire on events” to recall that triggers are the key differentiator, and that you never touch a server.
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 compute option allows you to run code in response to events without provisioning or managing servers, and supports triggers from HTTP, timers, and Azure service events?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Functions
Azure Functions is the correct answer because it is a serverless compute service that executes code in response to events, such as HTTP requests, timer-based schedules, or Azure service events (e.g., Blob Storage or Queue triggers). It abstracts server management entirely, allowing you to focus solely on the code logic, and automatically scales based on demand.
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 Logic Apps
Why it's wrong here
Logic Apps orchestrates workflows visually; Functions runs custom code in response to triggers.
✓
Azure Functions
Why this is correct
Azure Functions is serverless — runs code triggered by HTTP, timers, and Azure service events without server management.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Container Instances
Why it's wrong here
ACI runs containers on-demand; Functions is specifically for event-driven code execution.
✗
Azure App Service WebJobs
Why it's wrong here
WebJobs run background tasks within App Service plans; Functions is the dedicated serverless event-driven compute.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing Azure Functions (serverless, event-driven code execution) with Azure Logic Apps (workflow automation with connectors), as both use triggers, but Logic Apps cannot run custom code natively and is designed for integration workflows rather than code execution.
Detailed technical explanation
How to think about this question
Azure Functions uses a host runtime that listens to a variety of trigger bindings (e.g., HTTPTrigger, TimerTrigger, BlobTrigger) and invokes your function code when an event occurs. Under the hood, it leverages the Azure WebJobs SDK and the Functions runtime, which manages scaling via the Scale Controller that monitors queue length, HTTP request rates, or other metrics to add or remove instances. A real-world scenario is processing images uploaded to Blob Storage: a Blob-triggered Function automatically resizes the image without any manual provisioning, and the Scale Controller can spin up hundreds of instances during a spike.
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 Functions — Azure Functions is the correct answer because it is a serverless compute service that executes code in response to events, such as HTTP requests, timer-based schedules, or Azure service events (e.g., Blob Storage or Queue triggers). It abstracts server management entirely, allowing you to focus solely on the code logic, and automatically scales based on demand.
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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