Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company plans to containerize a legacy web application and run it on Azure. The application experiences variable traffic volumes, with periodic spikes during lunch hours and weekends. The company wants the solution to automatically increase the number of running container instances during high demand and reduce them during low demand, without requiring any manual intervention or management of server infrastructure. 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
Best answer
Azure App Service
Azure App Service can run containerized web applications and supports automatic scaling (horizontal scale) based on metrics like HTTP request rate or CPU utilization, without requiring any administrator to manage underlying VMs or orchestration pieces.
B
Distractor review
Azure Container Instances (ACI)
Azure Container Instances provides a simple way to run a container, but it does not have built-in autoscaling based on traffic load. Scaling multiple container groups must be implemented separately, often requiring external logic or additional services.
C
Distractor review
Azure Kubernetes Service (AKS)
Azure Kubernetes Service offers powerful container orchestration and can autoscale pods and nodes, but it still involves managing the Kubernetes cluster's infrastructure and configuration. The company wants to avoid any infrastructure management, making AKS more complex than needed for this scenario.
D
Distractor review
Azure Functions
Azure Functions is a serverless compute service designed for event-driven, short-lived functions. It is not intended for hosting long-running containerized web applications, and its scaling model is based on function executions rather than HTTP traffic to a persistent application.
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.
Related practice questions
Related AZ-900 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
AZ-900 cloud concepts practice questions
Practise AZ-900 questions linked to AZ-900 cloud concepts.
AZ-900 Azure services practice questions
Practise AZ-900 questions linked to AZ-900 Azure services.
AZ-900 pricing and support practice questions
Practise AZ-900 questions linked to AZ-900 pricing and support.
AZ-900 security and compliance practice questions
Practise AZ-900 questions linked to AZ-900 security and compliance.
AZ-900 governance practice questions
Practise AZ-900 questions linked to AZ-900 governance.
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 App Service — Azure App Service can host containerized web applications and provides built-in autoscaling based on metrics such as CPU usage or HTTP traffic, without requiring the user to manage virtual machines or orchestration components. Azure Container Instances (ACI) supports containers but lacks native autoscaling based on application load; scaling must be handled externally (e.g., via Azure Functions or a custom solution). Azure Kubernetes Service (AKS) provides powerful orchestration but requires the user to manage or at least configure the cluster's autoscaler and node pools. Azure Functions is event-driven and not designed for long-running web applications; it is best suited for short-duration, event-triggered workloads. Therefore, Azure App Service is the most appropriate choice for this scenario.
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.
Discussion
Loading comments…
Sign in to join the discussion.