SOA-C02 Cost and Performance Optimization Practice Question
This SOA-C02 practice question tests your understanding of cost and performance optimization. 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 SysOps administrator is managing a fleet of Amazon EC2 instances that run a batch processing job. The job runs for 30 minutes every hour. The administrator wants to optimize costs by using Spot Instances but must ensure that the job completes even if Spot Instances are interrupted. Which configuration should the administrator use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a mixed instances policy with both On-Demand and Spot Instances, and configure the Spot allocation strategy to 'lowestPrice'.
Option B is correct because using a mixed instances policy with both On-Demand and Spot Instances ensures that the baseline capacity is covered by On-Demand, and any interrupted Spot Instances can be replaced by On-Demand as a fallback. The Spot allocation strategy 'lowestPrice' is not specified but the key is the capacity-optimized or diversified strategy to reduce interruption. However, the question asks for ensuring completion; the best practice is to use a capacity-optimized allocation strategy. Actually, the correct answer is B: Use a mixed instances policy with a capacity-optimized allocation strategy and specify a percentage of On-Demand instances. But option B says 'lowestPrice', which is common but not best for stability. However, among the options, B is the only one that includes a mix. Option A is wrong because only Spot is risky. Option C is wrong because the job is not long-running (30 min), so persistence is not needed; but the job must complete, so if Spot is interrupted, it should be able to restart. Option D is wrong because it is wasteful to use only On-Demand.
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.
✗
Launch Spot Instances in an Auto Scaling group with a capacity-optimized allocation strategy.
Why it's wrong here
Only Spot Instances may be interrupted and the job may not complete.
✓
Use a mixed instances policy with both On-Demand and Spot Instances, and configure the Spot allocation strategy to 'lowestPrice'.
Why this is correct
Mixed instances provide reliability; 'lowestPrice' is not ideal but the mix ensures completion.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a Spot Fleet with a 'persistent' request type.
Why it's wrong here
Persistent Spot Fleet requests maintain target capacity but do not guarantee job completion.
✗
Use only On-Demand Instances to avoid interruptions.
Why it's wrong here
This is more expensive and not cost-optimized.
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: Use a mixed instances policy with both On-Demand and Spot Instances, and configure the Spot allocation strategy to 'lowestPrice'. — Option B is correct because using a mixed instances policy with both On-Demand and Spot Instances ensures that the baseline capacity is covered by On-Demand, and any interrupted Spot Instances can be replaced by On-Demand as a fallback. The Spot allocation strategy 'lowestPrice' is not specified but the key is the capacity-optimized or diversified strategy to reduce interruption. However, the question asks for ensuring completion; the best practice is to use a capacity-optimized allocation strategy. Actually, the correct answer is B: Use a mixed instances policy with a capacity-optimized allocation strategy and specify a percentage of On-Demand instances. But option B says 'lowestPrice', which is common but not best for stability. However, among the options, B is the only one that includes a mix. Option A is wrong because only Spot is risky. Option C is wrong because the job is not long-running (30 min), so persistence is not needed; but the job must complete, so if Spot is interrupted, it should be able to restart. Option D is wrong because it is wasteful to use only On-Demand.
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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