The answer is Azure Container Instances (ACI), the simplest container service for a scheduled background job that runs hourly for just 10 minutes. ACI is correct because it lets you run a containerized job without managing any orchestration platform, and with the `--restart-policy Never` flag, you can schedule it to execute once per hour and stop automatically, while per-second billing makes it highly cost-effective for short-lived tasks. On the AZ-900 exam, this question tests your ability to distinguish between Azure Container Instances (serverless, no orchestration) and Azure Container Apps or Azure Kubernetes Service (both require orchestration management). A common trap is choosing Azure Container Apps, which is designed for event-driven apps but still involves more configuration than needed for a simple scheduled job. Memory tip: think of ACI as “Azure’s Instant Container” — perfect for jobs that run and die fast, with no orchestration overhead.
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.
A company needs to run a simple background job that runs every hour for 10 minutes. They want to containerize the job but do not want to manage a container orchestration platform. Which Azure service is simplest and most cost-effective?
Correct. ACI is a serverless container platform that supports simple, quick execution of containers without orchestration overhead.
B
Azure Kubernetes Service
Why wrong: Incorrect. AKS is a managed Kubernetes orchestrator, which is overkill for a simple periodic job and introduces management complexity.
C
Azure Batch
Why wrong: Incorrect. Azure Batch is designed for large-scale parallel and high-performance computing jobs, not for a simple single-container task.
D
Azure Functions
Why wrong: Incorrect. While Functions can run code periodically, the scenario explicitly states the job is containerized, so ACI is the more direct fit for running a container.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Azure Container Instances
Azure Container Instances (ACI) is the simplest and most cost-effective choice because it allows you to run a containerized job directly without managing any underlying infrastructure or orchestration platform. For a short-lived, hourly job that runs for only 10 minutes, ACI provides fast startup, per-second billing, and native scheduling via the `--restart-policy Never` flag, making it ideal for background tasks that do not require persistent orchestration.
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 Container Instances
Why this is correct
Correct. ACI is a serverless container platform that supports simple, quick execution of containers without orchestration overhead.
Related concept
Read the scenario before looking for a memorised answer.
✗
Azure Kubernetes Service
Why it's wrong here
Incorrect. AKS is a managed Kubernetes orchestrator, which is overkill for a simple periodic job and introduces management complexity.
✗
Azure Batch
Why it's wrong here
Incorrect. Azure Batch is designed for large-scale parallel and high-performance computing jobs, not for a simple single-container task.
✗
Azure Functions
Why it's wrong here
Incorrect. While Functions can run code periodically, the scenario explicitly states the job is containerized, so ACI is the more direct fit for running a container.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Azure Functions for scheduled tasks, forgetting that Functions is not designed for containerized workloads and requires code-based execution, whereas ACI directly runs any container image with minimal configuration and no orchestration management.
Trap categories for this question
Scenario analysis trap
Incorrect. While Functions can run code periodically, the scenario explicitly states the job is containerized, so ACI is the more direct fit for running a container.
Detailed technical explanation
How to think about this question
Under the hood, ACI launches containers directly on Azure infrastructure using a hypervisor-level isolation technology, with startup times typically under a few seconds. For scheduled jobs, you can pair ACI with Azure Logic Apps or a simple cron-based Azure Automation runbook to trigger container groups on an hourly schedule, leveraging ACI's per-second billing to pay only for the 10 minutes of runtime. A real-world scenario is a data cleanup task that runs hourly; using ACI avoids the overhead of maintaining a Kubernetes cluster or provisioning VMs, while still supporting custom container images and environment variables.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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 Container Instances — Azure Container Instances (ACI) is the simplest and most cost-effective choice because it allows you to run a containerized job directly without managing any underlying infrastructure or orchestration platform. For a short-lived, hourly job that runs for only 10 minutes, ACI provides fast startup, per-second billing, and native scheduling via the `--restart-policy Never` flag, making it ideal for background tasks that do not require persistent orchestration.
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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