SOA-C02 Cost and Performance Optimization Practice Question
This SOA-C02 practice question tests your understanding of cost and performance optimization. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 job every night that takes exactly 2 hours to complete. The job is time-sensitive and cannot tolerate interruptions. The SysOps administrator needs to minimize compute costs for the Amazon EC2 instances used during this job. The job runs every day and has predictable resource requirements. Which purchasing option should the administrator choose?
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.
Reserved Instances provide a substantial discount for a steady-state workload and guarantee capacity, meeting both cost and reliability requirements.
B
Spot Instances
Why wrong: Spot Instances can be interrupted with little notice (EC2 can reclaim capacity), which is unacceptable for a time-sensitive batch job that cannot tolerate interruptions.
C
On-Demand Instances
Why wrong: On-Demand Instances offer flexibility but are more expensive; for a predictable daily workload, Reserved Instances are more cost-effective.
D
Dedicated Hosts
Why wrong: Dedicated Hosts provide physical servers dedicated for your use, typically for licensing or compliance requirements, and are significantly more costly than Reserved Instances.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Reserved Instances (Standard)
A Standard Reserved Instance is the best choice because the job runs every night for exactly 2 hours with predictable resource requirements, making it ideal for a 1-year or 3-year commitment that provides a significant discount (up to 72%) over On-Demand pricing. Since the job cannot tolerate interruptions, Reserved Instances offer capacity reservation and cost savings without the risk of termination that Spot Instances carry.
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.
✓
Reserved Instances (Standard)
Why this is correct
Reserved Instances provide a substantial discount for a steady-state workload and guarantee capacity, meeting both cost and reliability requirements.
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.
✗
Spot Instances
Why it's wrong here
Spot Instances can be interrupted with little notice (EC2 can reclaim capacity), which is unacceptable for a time-sensitive batch job that cannot tolerate interruptions.
✗
On-Demand Instances
Why it's wrong here
On-Demand Instances offer flexibility but are more expensive; for a predictable daily workload, Reserved Instances are more cost-effective.
✗
Dedicated Hosts
Why it's wrong here
Dedicated Hosts provide physical servers dedicated for your use, typically for licensing or compliance requirements, and are significantly more costly than Reserved Instances.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Spot Instances for cost savings without recognizing the 'cannot tolerate interruptions' constraint, or they incorrectly assume Reserved Instances require a full-time workload, when in fact they can be applied to any predictable usage pattern, even a 2-hour daily window.
Detailed technical explanation
How to think about this question
Standard Reserved Instances provide a capacity reservation in a specific Availability Zone and a billing discount applied to matching instance usage, but they do not guarantee that the instance will always be available if AWS runs out of capacity; however, for a predictable nightly job, the risk is minimal. Convertible Reserved Instances offer flexibility to change instance families but at a lower discount (typically 54% vs 72%), so Standard is optimal here. The job's 2-hour duration means the administrator could also consider a partial-hour billing nuance: AWS bills per second for Linux instances, but Reserved Instances still provide the best overall savings for consistent usage.
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.
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: Reserved Instances (Standard) — A Standard Reserved Instance is the best choice because the job runs every night for exactly 2 hours with predictable resource requirements, making it ideal for a 1-year or 3-year commitment that provides a significant discount (up to 72%) over On-Demand pricing. Since the job cannot tolerate interruptions, Reserved Instances offer capacity reservation and cost savings without the risk of termination that Spot Instances carry.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.