Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company develops a data processing application that runs only when new files are uploaded to an Azure Blob Storage container. The application must scale automatically to handle hundreds of simultaneous file uploads and must not incur cost when no files are being processed. The development team wants the simplest solution that requires no infrastructure management. Which Azure compute service should they use?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
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Azure Virtual Machines Scale Set with autoscale rules
A Virtual Machine Scale Set requires you to manage virtual machine images, operating system updates, and scaling rules. It incurs cost even when idle because the underlying VMs are running. While it can scale automatically, it is not a serverless or simplest solution for event-driven file processing.
B
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Azure Batch
Azure Batch is designed for large-scale parallel and high-performance computing jobs. It requires you to create and manage a pool of compute nodes. It is overkill for simple event-driven blob processing and introduces management overhead that the team wants to avoid.
C
Best answer
Azure Functions with a Blob Storage trigger
Azure Functions is serverless, scales automatically in response to events, and charges only for execution time. Using a Blob Storage trigger, the function runs whenever a new blob is created. This is the simplest solution that meets all requirements: automatic scaling, no cost when idle, and no infrastructure management.
D
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Azure Container Instances
Azure Container Instances allow you to run containers without managing servers. However, they are not inherently event-driven like Azure Functions. To trigger a container instance on a blob upload, you would need additional components such as Azure Logic Apps or an Azure Function, increasing complexity. Also, while you can stop containers to save cost, the default model costs for the container's lifetime.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer is building a serverless application that requires integration with an on-premises SQL Server database for real-time data processing. The on-premises network is connected to Azure via a site-to-site VPN. Which Azure service would allow the function to securely access the on-premises database without exposing it to the public internet?
Question 2
A solutions architect is designing a storage solution for a large media company. The company needs to store video files that are accessed infrequently but must be retained for several years for compliance. Which two Azure storage options meet these requirements? (Select two.)
Question 3
A company deploys a multi-tier application using Azure virtual machines. The web tier VMs must be evenly distributed across two distinct data centers within an Azure region to avoid a single point of failure from an infrastructure outage. Which Azure construct should they use to meet this requirement?
Question 4
A company wants to enforce a set of security policies across all their Azure subscriptions. They have created several individual policy definitions. Which Azure construct should they use to group these policies together and assign them as a single package?
Question 5
A company deploys a line-of-business application on an Azure virtual machine. The IT team wants to ensure the application remains secure. According to the shared responsibility model, which of the following security tasks is the sole responsibility of the customer (the company)?
Question 6
A company develops a web API that runs on Azure App Service. The development team wants to deploy a new version of the API to a staging environment, run integration tests against it, and then gradually shift production traffic to the new version. If any issues are detected, they want to immediately roll back to the previous version without redeploying. Which Azure App Service feature should the team use to meet these requirements?
FAQ
Questions learners often ask
What does this AZ-900 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Azure Functions with a Blob Storage trigger — Azure Functions is a serverless compute service that is event-driven. It can be triggered directly by Azure Blob Storage when a new blob is created. Azure Functions scales automatically based on the number of incoming events, and you pay only for the execution time and resources consumed during execution. This meets the requirement of zero cost when idle and no infrastructure management. The other options either require manual scaling or are less suited for simple event-driven file processing.
What should I do if I get this AZ-900 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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