SOA-C02 Cost and Performance Optimization Practice Question
This SOA-C02 practice question tests your understanding of cost and performance optimization. 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.
An administrator attaches the above IAM policy to a user. The user needs to stop an EC2 instance to save costs. The user reports that they are unable to stop the instance. What is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The instance is part of an Auto Scaling group.
The most likely cause is that the instance is part of an Auto Scaling group (ASG). Although the IAM policy allows ec2:StopInstances, stopping an instance that belongs to an ASG will not effectively reduce costs because the ASG will automatically launch a replacement instance to maintain the desired capacity. Additionally, ASG settings such as health checks or scale-in protection may prevent the instance from being stopped directly or cause it to be immediately replaced, making the stop action ineffective for cost savings. Therefore, the user's inability to stop the instance to save costs is due to the instance being managed by an Auto Scaling group.
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.
✗
The instance has termination protection enabled.
Why it's wrong here
Termination protection does not prevent stop.
✓
The instance is part of an Auto Scaling group.
Why this is correct
Stopping an instance in an Auto Scaling group will cause the group to launch a new instance, defeating the purpose of stopping.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The IAM policy does not allow ec2:StopInstances.
Why it's wrong here
The policy explicitly allows StopInstances.
✗
The user does not have permission to describe instances.
Why it's wrong here
The policy allows DescribeInstances.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
What to study next
Got this wrong? Here's your next step.
Identify which SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Cost and Performance Optimization — This question tests Cost and Performance Optimization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The instance is part of an Auto Scaling group. — The most likely cause is that the instance is part of an Auto Scaling group (ASG). Although the IAM policy allows ec2:StopInstances, stopping an instance that belongs to an ASG will not effectively reduce costs because the ASG will automatically launch a replacement instance to maintain the desired capacity. Additionally, ASG settings such as health checks or scale-in protection may prevent the instance from being stopped directly or cause it to be immediately replaced, making the stop action ineffective for cost savings. Therefore, the user's inability to stop the instance to save costs is due to the instance being managed by an Auto Scaling group.
What should I do if I get this SOA-C02 question wrong?
Identify which SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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