The correct action is to downsize the EC2 instance from t3.large to t3.medium to reduce costs. This is because the CloudWatch data shows an average CPU utilization of only 15.5% over the week, which clearly indicates the instance is over-provisioned for its actual workload. Downsizing to a t3.medium, which offers half the vCPUs and memory, will likely meet performance needs while cutting expenses. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your ability to interpret CloudWatch metrics and apply right-sizing strategies for cost optimization—a core responsibility of a SysOps administrator. A common trap is jumping to Reserved Instances, but those only save money when utilization is consistently high; here, low CPU usage makes downsizing the immediate, low-risk fix. Memory tip: “Low CPU, downsize to medium—don’t reserve what you don’t use.”
SOA-C02 Cost and Performance Optimization Practice Question
This SOA-C02 practice question tests your understanding of cost and performance optimization. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Network Topology
An administrator runs the above CloudWatch command to analyze CPU utilization for an EC2 instance. The instance is currently running with a t3.large instance type. The company wants to optimize costs. Based on the data, which action should the administrator take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Downsize the instance to t3.medium to reduce costs.
The average CPU utilization over the week is low (around 15.5%), indicating the instance is over-provisioned. Downsizing to a t3.medium (half the vCPUs and memory) would likely be sufficient and reduce costs. Reserved Instances would be cost-effective only if the instance runs consistently, but the current utilization is low. Scaling up would increase costs. Stopping the instance is not an option if needed.
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.
✗
Stop the instance to save costs immediately.
Why it's wrong here
Stopping may not be feasible if the instance is needed.
✓
Downsize the instance to t3.medium to reduce costs.
Why this is correct
Low CPU utilization suggests over-provisioning; downsizing saves costs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Scale up the instance to t3.xlarge to improve performance.
Why it's wrong here
Scaling up increases costs unnecessarily.
✗
Purchase a Reserved Instance for the current instance type.
Why it's wrong here
Reserved Instances provide a discount but do not address over-provisioning.
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: Downsize the instance to t3.medium to reduce costs. — The average CPU utilization over the week is low (around 15.5%), indicating the instance is over-provisioned. Downsizing to a t3.medium (half the vCPUs and memory) would likely be sufficient and reduce costs. Reserved Instances would be cost-effective only if the instance runs consistently, but the current utilization is low. Scaling up would increase costs. Stopping the instance is not an option if needed.
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.
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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