Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company is migrating its on-premises batch processing jobs to Azure. The jobs are triggered by file uploads to an on-premises file share. After migration, the files will be uploaded to Azure Blob Storage. The company wants a solution where code runs automatically whenever a new blob is created, with no requirement to manage servers or containers. The code must process the blob and then terminate. Compute resources should be used only when there is a file to process. Which Azure compute service should the company 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 App Service
Azure App Service is a platform-as-a-service (PaaS) for hosting web apps, REST APIs, and mobile back ends. It runs continuously and is not designed for event-triggered, short-lived executions that automatically start and stop. It also requires an always-on instance, meaning you pay for running the app even when idle.
B
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Azure Kubernetes Service (AKS)
AKS is a managed container orchestration service that requires managing a cluster of virtual machines (nodes). While you can run event-driven workloads on AKS using tools like Keda, it involves more operational overhead than a serverless option and does not naturally scale to zero when idle.
C
Best answer
Azure Functions
Azure Functions is a serverless compute service that runs code in response to events (e.g., blob creation, HTTP requests, queues) and automatically scales. It charges only for execution time, eliminating idle cost. This matches the need for automatic, triggered processing with no infrastructure management.
D
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Azure Virtual Machine Scale Sets
Azure Virtual Machine Scale Sets provide a group of load-balanced VMs that can autoscale. However, they require you to manage VMs, install the application code, and handle patching. They incur costs for idle VMs and are not an event-driven serverless compute service.
Common exam trap
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.
Technical deep dive
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.
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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?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Azure Functions — Azure Functions is an event-driven, serverless compute service that executes code only when triggered by an event, such as a new blob being created in Azure Blob Storage. It automatically scales and you pay only for the compute time consumed. This aligns perfectly with the requirement to run code on blob creation with no server management and no idle compute cost.
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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