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.
Which TWO actions can reduce costs for an Amazon EC2 environment that runs non-critical batch jobs that can be interrupted? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Scheduled Reserved Instances.
Scheduled Reserved Instances allow you to reserve capacity for recurring time windows, such as daily or weekly batch jobs. This provides a significant discount over On-Demand pricing (up to 30-40%) while ensuring capacity is available when needed, making it cost-effective for predictable, interruptible workloads.
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.
✓
Use Scheduled Reserved Instances.
Why this is correct
Allows reservation for specific time windows, cost-effective for predictable schedules.
Related concept
Read the scenario before looking for a memorised answer.
✗
Associate Elastic IP addresses with the instances.
Why it's wrong here
Elastic IPs not attached to running instances incur charges.
✗
Use Dedicated Hosts.
Why it's wrong here
Dedicated Hosts are more expensive, for compliance needs.
✓
Use Spot Instances for the batch jobs.
Why this is correct
Spot Instances offer up to 90% discount; suitable for interruptible workloads.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use On-Demand Instances.
Why it's wrong here
On-Demand is the most expensive pricing model.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often overlook Scheduled Reserved Instances as a cost-saving option for predictable batch jobs, mistakenly thinking only Spot Instances apply, or they confuse Elastic IP addresses with cost reduction when they actually add cost if not managed properly.
Detailed technical explanation
How to think about this question
Spot Instances leverage AWS's spare EC2 capacity and can offer up to 90% discount compared to On-Demand pricing, but they can be terminated with a 2-minute warning when capacity is reclaimed. Scheduled Reserved Instances are purchased for a 1-year term and are ideal for predictable, recurring batch windows; they do not support interruption but provide a fixed discount for those specific time slots. Combining both allows you to run batch jobs at the lowest possible cost while tolerating potential interruptions.
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: Use Scheduled Reserved Instances. — Scheduled Reserved Instances allow you to reserve capacity for recurring time windows, such as daily or weekly batch jobs. This provides a significant discount over On-Demand pricing (up to 30-40%) while ensuring capacity is available when needed, making it cost-effective for predictable, interruptible workloads.
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.
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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
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