- A
On-Demand Instances
Why wrong: On-Demand Instances offer full flexibility but are more expensive than Spot Instances for workloads that can tolerate interruptions.
- B
Reserved Instances
Why wrong: Reserved Instances provide a discount for a 1- or 3-year commitment, which is not cost-effective for a workload that runs only 2 hours per night. The upfront commitment does not align with the usage pattern.
- C
Spot Instances
Spot Instances allow you to use spare EC2 capacity at up to 90% discount compared to On-Demand. The workload is interruption-tolerant and fits the nightly batch window well, making this the most cost-effective option.
- D
Dedicated Hosts
Why wrong: Dedicated Hosts provide physical servers dedicated to your use, typically for licensing or compliance requirements. They are the most expensive option and are not suitable for this cost-sensitive, short-duration workload.
SOA-C02 Cost and Performance Optimization Practice Question
This SOA-C02 practice question tests your understanding of cost and performance optimization. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 runs a batch processing application on Amazon EC2 that runs for 2 hours every night. The workload can tolerate interruptions. Which EC2 purchasing option provides the lowest cost for this use case?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Spot Instances
Spot Instances are the correct choice because the workload is fault-tolerant, runs for a fixed 2-hour window nightly, and can tolerate interruptions. Spot Instances offer significant cost savings (up to 90% off On-Demand) by using spare EC2 capacity, which aligns perfectly with a batch job that can be retried if interrupted.
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.
- ✗
On-Demand Instances
Why it's wrong here
On-Demand Instances offer full flexibility but are more expensive than Spot Instances for workloads that can tolerate interruptions.
- ✗
Reserved Instances
Why it's wrong here
Reserved Instances provide a discount for a 1- or 3-year commitment, which is not cost-effective for a workload that runs only 2 hours per night. The upfront commitment does not align with the usage pattern.
- ✓
Spot Instances
Why this is correct
Spot Instances allow you to use spare EC2 capacity at up to 90% discount compared to On-Demand. The workload is interruption-tolerant and fits the nightly batch window well, making this the most cost-effective option.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Dedicated Hosts
Why it's wrong here
Dedicated Hosts provide physical servers dedicated to your use, typically for licensing or compliance requirements. They are the most expensive option and are not suitable for this cost-sensitive, short-duration workload.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose Reserved Instances because they see a predictable nightly schedule, but they overlook that Reserved Instances are cost-effective only for 24/7 workloads, not for short, interruptible batch jobs where Spot Instances provide far greater savings.
Detailed technical explanation
How to think about this question
Spot Instances are reclaimed by AWS with a 2-minute warning when capacity is needed elsewhere, making them ideal for stateless, checkpointable batch jobs. The nightly 2-hour window means the job can be designed to save progress to Amazon S3 or EFS and resume from the last checkpoint if interrupted, ensuring completion despite potential reclaims. Spot pricing fluctuates based on supply and demand, but for a short, predictable window, the cost savings are substantial compared to On-Demand.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
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: Spot Instances — Spot Instances are the correct choice because the workload is fault-tolerant, runs for a fixed 2-hour window nightly, and can tolerate interruptions. Spot Instances offer significant cost savings (up to 90% off On-Demand) by using spare EC2 capacity, which aligns perfectly with a batch job that can be retried if interrupted.
What should I do if I get this SOA-C02 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.
About these practice questions
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Last reviewed: Jun 11, 2026
This SOA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SOA-C02 exam.
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