AZ-204 Develop Azure compute solutions Practice Question
This AZ-204 practice question tests your understanding of develop azure compute solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 containerized checkout API deployed to Azure Container Apps must scale to zero when idle and scale out based on queue length. What should the developer configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A KEDA-based scale rule for the queue trigger
Azure Container Apps supports KEDA (Kubernetes Event-Driven Autoscaling) for scaling based on external metrics. A KEDA-based scale rule configured with an Azure Queue Storage trigger allows the containerized checkout API to scale to zero when no messages are in the queue and scale out dynamically as queue length increases, meeting the requirement precisely.
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.
✓
A KEDA-based scale rule for the queue trigger
Why this is correct
Azure Container Apps uses KEDA scale rules to scale replicas based on event sources such as queues.
Related concept
Read the scenario before looking for a memorised answer.
✗
A manual replica count only
Why it's wrong here
Manual replicas do not scale to zero or react to queue length.
✗
An Availability Set
Why it's wrong here
Availability Sets apply to VMs, not Container Apps scaling.
✗
An Azure Front Door health probe
Why it's wrong here
Health probes route traffic but do not scale Container Apps based on queue length.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse Azure Container Apps' built-in HTTP scaling rules with KEDA-based event-driven scaling, or incorrectly assume that a manual replica count or a load-balancing health probe can achieve the required queue-based autoscaling behavior.
Detailed technical explanation
How to think about this question
KEDA works by deploying a ScaledObject resource that defines the trigger (e.g., Azure Queue Storage) and scaling parameters. It uses the queue length metric to compute the desired replica count via a formula (e.g., target queue length per replica). Under the hood, KEDA queries the queue via the Azure Storage REST API and adjusts the replica count in the Container Apps scaling controller, enabling scale-to-zero when the queue is empty and rapid scale-out as messages accumulate.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Develop Azure compute solutions — This question tests Develop Azure compute solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A KEDA-based scale rule for the queue trigger — Azure Container Apps supports KEDA (Kubernetes Event-Driven Autoscaling) for scaling based on external metrics. A KEDA-based scale rule configured with an Azure Queue Storage trigger allows the containerized checkout API to scale to zero when no messages are in the queue and scale out dynamically as queue length increases, meeting the requirement precisely.
What should I do if I get this AZ-204 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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Question Discussion
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