← SOA-C02·Amazon Web Services

Question 846 of 1,546

Cost and Performance Optimization →mediumMultiple ChoiceObjective-mapped

Standard Reserved Instances for Batch Jobs: Cost Optimization Strategy

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.

A
Reserved Instances (Standard)
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.

Full breakdown with real-world context →

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

✓

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.

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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: 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

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Same concept, more angles

1 more ways this is tested on SOA-C02

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. An application runs on c5.xlarge EC2 instances 24 hours a day, 7 days a week in us-east-1. The workload is stable and will not change instance type for at least 12 months. The team wants to reduce compute costs by 30 to 40 percent compared to On-Demand pricing. Which purchasing option achieves this with the lowest financial risk?

easy

✓ A.Purchase a 1-year Standard Reserved Instance for c5.xlarge in us-east-1 with All Upfront or Partial Upfront payment
B.Use Spot Instances with an interruption tolerance of 5 minutes for the workload
C.Enable EC2 Auto Scaling with a target tracking policy to scale down to zero instances during off-peak hours
D.Purchase a 3-year Convertible Reserved Instance to maximize the discount percentage

Why A: A 1-year Standard Reserved Instance (RI) with All Upfront or Partial Upfront payment offers a 30-40% discount over On-Demand pricing for a stable, always-on workload. This option provides the lowest financial risk because it commits to a fixed instance type and region for only one year, matching the workload's stable nature without the flexibility premium of Convertible RIs or the interruption risk of Spot Instances.

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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.