Quick Answer
The answer is the Consumption plan. This plan is correct because it uses an event-driven, dynamic scaling model that automatically scales out to handle peak order processing loads and scales down to zero instances when idle, ensuring you only pay for execution time and resources consumed during active function runs. On the AZ-204 exam, this question tests your understanding of Azure Functions hosting plan trade-offs, specifically how the Consumption plan’s pay-per-execution model differs from Premium’s pre-warmed instances and App Service’s always-on dedicated resources. A common trap is choosing Premium for its “always ready” instances, but the key constraint here is zero cost when idle—Consumption is the only plan that can scale to zero. Memory tip: “Consume only when running, pay nothing when done.”
This AZ-204 practice question tests your understanding of develop azure compute solutions. 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.
You are developing an Azure Functions app that processes orders. The function must scale out automatically during peak hours but should not incur costs when idle. Which hosting plan should you use?
Premium plan
Why wrong: Premium plan has pre-warmed instances and incurs costs even when idle.
Container Instances
Why wrong: Container Instances are for running containers, not Azure Functions directly.
App Service plan
Why wrong: App Service plan requires a dedicated plan with always-on, leading to constant cost.
Consumption plan
Consumption plan scales automatically and charges only when the function runs.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Consumption plan
The Consumption plan is correct because it automatically scales your function app based on demand, including scaling out to handle peak loads, and you only pay for execution time and resources consumed when your functions are running. When idle, there are no costs because the plan does not reserve any instances; it relies on a dynamic, event-driven scale model that can scale down to zero.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Premium plan
Why it's wrong here
Premium plan has pre-warmed instances and incurs costs even when idle.
Container Instances
Why it's wrong here
Container Instances are for running containers, not Azure Functions directly.
App Service plan
Why it's wrong here
App Service plan requires a dedicated plan with always-on, leading to constant cost.
Consumption plan
Why this is correct
Consumption plan scales automatically and charges only when the function runs.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse the Premium plan's 'always ready' instances with the Consumption plan's true scale-to-zero capability, mistakenly thinking Premium is required for automatic scaling, when in fact Consumption provides automatic scaling and zero-cost idle behavior.
Detailed technical explanation
Under the hood, the Consumption plan uses the Azure Functions host runtime and the Scale Controller, which monitors the number of events targeting your function (e.g., queue messages, HTTP requests) and decides whether to add or remove worker instances. The Scale Controller uses a threshold-based algorithm; for example, for a queue-triggered function, it adds one instance for every 1,000 messages in the queue. When no events are present, the Scale Controller scales the app down to zero instances, meaning no compute resources are billed, though you still pay for storage used by the function code and bindings.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
The correct answer is: Consumption plan — The Consumption plan is correct because it automatically scales your function app based on demand, including scaling out to handle peak loads, and you only pay for execution time and resources consumed when your functions are running. When idle, there are no costs because the plan does not reserve any instances; it relies on a dynamic, event-driven scale model that can scale down to zero.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This AZ-204 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-204 exam.
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