The correct choice is to implement an Application Load Balancer with an Auto Scaling group to distribute traffic across multiple instances. This solution directly addresses the need to scale a stateful web application horizontally, as the ALB evenly routes incoming requests across a dynamic fleet of EC2 instances, while Auto Scaling automatically adds or removes instances based on CPU and memory utilization thresholds. For the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of horizontal scaling versus vertical scaling—a common trap is to assume that upgrading the instance type (vertical scaling) is the only option, but that approach is limited by instance size and often incurs downtime. Instead, remember that stateful applications can be made scalable by offloading session state to an external store like ElastiCache or DynamoDB, allowing the ALB and Auto Scaling to work effectively. A quick memory tip: “Scale out, not up—ALB and ASG are the dynamic duo for cost-effective performance.”
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.
A company is running a stateful web application on a single EC2 instance with a 500 GB gp2 EBS volume. The instance is currently at 80% CPU and memory utilization during peak hours. The company wants to improve performance and scalability without incurring high costs. What should the SysOps administrator do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement an Application Load Balancer with an Auto Scaling group to distribute traffic across multiple instances.
The correct answer is B. Using an Application Load Balancer and Auto Scaling group allows the application to scale out based on demand, improving performance and cost efficiency. Option A is wrong because vertical scaling may cause downtime and is limited. Option C is wrong because converting to gp3 provides performance at lower cost but does not address scalability. Option D is wrong because increasing swap space is a temporary fix and does not improve performance.
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.
✓
Implement an Application Load Balancer with an Auto Scaling group to distribute traffic across multiple instances.
Why this is correct
Horizontal scaling improves performance and availability while optimizing cost.
Related concept
Read the scenario before looking for a memorised answer.
✗
Upgrade the instance to a larger size (vertical scaling).
Why it's wrong here
Vertical scaling has limits and may cause downtime; does not provide scalability.
✗
Increase the swap space on the instance to handle memory pressure.
Why it's wrong here
Swap is much slower than RAM; not a solution for performance.
✗
Migrate the EBS volume from gp2 to gp3 to improve I/O performance.
Why it's wrong here
This addresses storage performance but not compute scalability.
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: Implement an Application Load Balancer with an Auto Scaling group to distribute traffic across multiple instances. — The correct answer is B. Using an Application Load Balancer and Auto Scaling group allows the application to scale out based on demand, improving performance and cost efficiency. Option A is wrong because vertical scaling may cause downtime and is limited. Option C is wrong because converting to gp3 provides performance at lower cost but does not address scalability. Option D is wrong because increasing swap space is a temporary fix and does not improve performance.
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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