- A
On-Demand Instances
Why wrong: On-Demand instances are fully flexible but are more expensive than Spot. They provide no interruption, but the goal is cost minimization, and the job can handle interruptions.
- B
Reserved Instances (Standard 1-year)
Why wrong: Reserved Instances provide a discount for a commitment, but the job runs only 1 hour per day. A 1-year commitment would waste resources during idle hours, making it less cost-effective than Spot.
- C
Spot Instances
Spot Instances are the cheapest option. They can be interrupted, but because the job can be interrupted and resumed (checkpointed), this is acceptable and yields the highest cost savings.
- D
Dedicated Hosts
Why wrong: Dedicated Hosts are expensive and are typically used for server-bound software licenses. They are not cost-effective for a batch job that runs only 1 hour per night.
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 runs a batch processing application on Amazon EC2 instances every night. The job takes exactly 1 hour to complete and is time-sensitive. The SysOps administrator wants to minimize compute costs while ensuring the job can be interrupted and resumed if needed. Which EC2 purchasing option is most cost-effective?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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 most cost-effective option because the batch job is fault-tolerant (can be interrupted and resumed) and runs for exactly 1 hour nightly. Spot Instances offer up to 90% discount compared to On-Demand, and with the ability to handle interruptions via checkpointing, they meet the requirement for cost minimization while supporting resumption.
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 are fully flexible but are more expensive than Spot. They provide no interruption, but the goal is cost minimization, and the job can handle interruptions.
- ✗
Reserved Instances (Standard 1-year)
Why it's wrong here
Reserved Instances provide a discount for a commitment, but the job runs only 1 hour per day. A 1-year commitment would waste resources during idle hours, making it less cost-effective than Spot.
- ✓
Spot Instances
Why this is correct
Spot Instances are the cheapest option. They can be interrupted, but because the job can be interrupted and resumed (checkpointed), this is acceptable and yields the highest cost savings.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Dedicated Hosts
Why it's wrong here
Dedicated Hosts are expensive and are typically used for server-bound software licenses. They are not cost-effective for a batch job that runs only 1 hour per night.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume Spot Instances are unsuitable for time-sensitive jobs due to potential interruptions, but the question explicitly states the job can be interrupted and resumed, making Spot the correct cost-effective choice over Reserved Instances or On-Demand.
Detailed technical explanation
How to think about this question
Spot Instances leverage spare EC2 capacity and can be reclaimed by AWS with a 2-minute interruption notice. For batch processing, implementing checkpointing (e.g., saving intermediate state to Amazon S3 or EFS) allows the job to resume from the last checkpoint after a new Spot Instance is launched, ensuring completion despite interruptions. The Spot Instance pricing model uses a market-based spot price that fluctuates but typically remains well below On-Demand rates, making it ideal for fault-tolerant, time-sensitive workloads.
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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Cost and Performance Optimization — study guide chapter
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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 most cost-effective option because the batch job is fault-tolerant (can be interrupted and resumed) and runs for exactly 1 hour nightly. Spot Instances offer up to 90% discount compared to On-Demand, and with the ability to handle interruptions via checkpointing, they meet the requirement for cost minimization while supporting resumption.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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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