- A
EC2 On-Demand Instances to avoid interruptions
Why wrong: On-Demand avoids interruption risk, but the cost is typically higher than Spot. Because your design explicitly supports restart from checkpoints, you can accept interruptions to gain Spot’s pricing advantage.
- B
EC2 Spot Instances with checkpoint-based interruption handling
Spot Instances are priced lower because AWS can reclaim capacity. When your workload can be interrupted and later restarted from checkpoints, the interruption model is compatible with Spot, making it the most cost-optimized option among the choices.
- C
Savings Plans to guarantee capacity for the entire year
Why wrong: Savings Plans provide discounted pricing based on usage commitment, but they do not guarantee Spot-like interruption behavior and they do not specifically address the interruption-tolerant execution model. Since your main lever for maximum savings here is accepting interruption for lower Spot pricing, Savings Plans are not the best fit.
- D
Reserved Instances with no interruption handling
Why wrong: Reserved Instances reduce cost compared to On-Demand, but they still assume more stable capacity usage. They are not the best choice when interruptions are acceptable and you can directly use Spot’s lower interrupted pricing with checkpoint recovery.
SAA-C03 Design Cost-Optimized Architectures Practice Question
This SAA-C03 practice question tests your understanding of design cost-optimized architectures. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
You need to run batch jobs on EC2. The jobs can tolerate interruptions: if an instance is terminated, the job can restart from checkpoints. To reduce compute cost as much as possible, what is the best choice?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
EC2 Spot Instances with checkpoint-based interruption handling
Spot Instances offer significant cost savings (up to 90% compared to On-Demand) but can be reclaimed by AWS with a two-minute warning. Since the batch jobs can tolerate interruptions and restart from checkpoints, Spot Instances are the most cost-effective choice. This aligns with the requirement to reduce compute cost as much as possible while handling interruptions gracefully.
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.
- ✗
EC2 On-Demand Instances to avoid interruptions
Why it's wrong here
On-Demand avoids interruption risk, but the cost is typically higher than Spot. Because your design explicitly supports restart from checkpoints, you can accept interruptions to gain Spot’s pricing advantage.
- ✓
EC2 Spot Instances with checkpoint-based interruption handling
Why this is correct
Spot Instances are priced lower because AWS can reclaim capacity. When your workload can be interrupted and later restarted from checkpoints, the interruption model is compatible with Spot, making it the most cost-optimized option among the choices.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Savings Plans to guarantee capacity for the entire year
Why it's wrong here
Savings Plans provide discounted pricing based on usage commitment, but they do not guarantee Spot-like interruption behavior and they do not specifically address the interruption-tolerant execution model. Since your main lever for maximum savings here is accepting interruption for lower Spot pricing, Savings Plans are not the best fit.
- ✗
Reserved Instances with no interruption handling
Why it's wrong here
Reserved Instances reduce cost compared to On-Demand, but they still assume more stable capacity usage. They are not the best choice when interruptions are acceptable and you can directly use Spot’s lower interrupted pricing with checkpoint recovery.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose On-Demand or Reserved Instances because they fear interruptions, but the question explicitly states the jobs can tolerate interruptions, so the most cost-effective option is Spot Instances, not a more expensive but stable alternative.
Detailed technical explanation
How to think about this question
Spot Instances are priced based on spare EC2 capacity and can be reclaimed by AWS with a two-minute interruption notice via the EC2 Instance Metadata Service (169.254.169.254/latest/meta-data/spot/instance-action). For batch jobs that checkpoint their progress (e.g., writing intermediate results to Amazon S3 or EFS), the job can resume on a new Spot Instance from the last checkpoint, making the cost savings highly effective. In practice, using a mixed instance strategy with Spot Fleet or EC2 Auto Scaling groups can further optimize cost and availability.
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 SAA-C03 question test?
Design Cost-Optimized Architectures — This question tests Design Cost-Optimized Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: EC2 Spot Instances with checkpoint-based interruption handling — Spot Instances offer significant cost savings (up to 90% compared to On-Demand) but can be reclaimed by AWS with a two-minute warning. Since the batch jobs can tolerate interruptions and restart from checkpoints, Spot Instances are the most cost-effective choice. This aligns with the requirement to reduce compute cost as much as possible while handling interruptions gracefully.
What should I do if I get this SAA-C03 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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
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