Quick Answer
The answer is On-Demand Instances and Spot Instances. Spot Instances are the ideal primary choice for this batch processing workload because they offer significant cost optimization for fault-tolerant, interruptible tasks, while On-Demand Instances serve as a reliable fallback when Spot capacity is unavailable, ensuring the job completes daily. This combination directly addresses the search intent of spot instances on demand batch processing cost optimization by leveraging steep discounts for the interruptible core work and paying standard rates only when necessary. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your ability to balance cost and reliability for non-critical, time-flexible workloads, often appearing as a trap where candidates mistakenly choose Reserved Instances due to the daily schedule. Remember the memory tip: "Spot for the savings, On-Demand for the safety net."
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 SysOps administrator is designing a cost-effective architecture for a batch processing workload that runs once per day and can tolerate interruptions. The workload uses EC2 instances. Which TWO purchasing options should the administrator consider? (Choose two.)
Dedicated Hosts
Why wrong: Expensive and not needed for batch processing.
Spot Instances
Provide significant cost savings for interruptible workloads.
On-Demand Instances
Provide flexibility and can complement Spot Instances.
Reserved Instances (Standard)
Why wrong: Best for steady-state workloads, not intermittent batch jobs.
Capacity Reservations
Why wrong: Reserve capacity but incur costs even if unused.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Spot Instances
Option B and Option D are correct. Spot Instances are ideal for fault-tolerant, interruptible workloads at a steep discount. On-Demand Instances can be used as a fallback if Spot capacity is unavailable. Option A is wrong because Reserved Instances require a 1- or 3-year commitment for a once-daily job. Option C is wrong because Dedicated Hosts are expensive. Option E is wrong because Capacity Reservations incur costs even when not running.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Dedicated Hosts
Why it's wrong here
Expensive and not needed for batch processing.
Spot Instances
Why this is correct
Provide significant cost savings for interruptible workloads.
Related concept
Read the scenario before looking for a memorised answer.
On-Demand Instances
Why this is correct
Provide flexibility and can complement Spot Instances.
Related concept
Read the scenario before looking for a memorised answer.
Reserved Instances (Standard)
Why it's wrong here
Best for steady-state workloads, not intermittent batch jobs.
Capacity Reservations
Why it's wrong here
Reserve capacity but incur costs even if unused.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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 — study guide chapter
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Cost and Performance Optimization practice questions
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FAQ
Cost and Performance Optimization — This question tests Cost and Performance Optimization — Read the scenario before looking for a memorised answer..
The correct answer is: Spot Instances — Option B and Option D are correct. Spot Instances are ideal for fault-tolerant, interruptible workloads at a steep discount. On-Demand Instances can be used as a fallback if Spot capacity is unavailable. Option A is wrong because Reserved Instances require a 1- or 3-year commitment for a once-daily job. Option C is wrong because Dedicated Hosts are expensive. Option E is wrong because Capacity Reservations incur costs even when not running.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 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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