- A
Run the workload on Amazon EC2 Spot Instances.
Spot Instances are significantly cheaper than On-Demand capacity and are a good fit when the workload can tolerate interruption. Because the job can restart from checkpoints, interruptions are acceptable.
- B
Store checkpoints in durable storage such as Amazon S3.
Durable checkpoints allow the job to resume from the last saved state after an interruption. This avoids reprocessing all work from the beginning and makes interruption recovery practical.
- C
Use a single On-Demand instance in one Availability Zone only.
Why wrong: A single On-Demand instance does not provide strong interruption resilience and gives up the main cost advantage of Spot. It is also less tolerant of an AZ failure.
- D
Disable automatic replacement so the job is never restarted.
Why wrong: Disabling replacement defeats resilience. If the instance is interrupted or fails, the batch job would remain down until someone manually intervenes.
- E
Keep all intermediate state only in instance memory.
Why wrong: Instance memory is lost when the instance stops or is interrupted. Restartable batch jobs need durable checkpoint storage rather than ephemeral in-memory state only.
Quick Answer
The answer is to use Amazon EC2 Spot Instances combined with storing checkpoints in durable storage like Amazon S3. This pairing works because Spot Instances offer up to 90% cost savings over On-Demand, but can be reclaimed with a two-minute warning; by writing checkpoints to S3, the batch processing job can simply resume from the last saved state after an interruption, making the workload fault-tolerant and stateless. On the SAA-C03 exam, this scenario tests your understanding of cost optimization strategies for resilient workloads—a common trap is choosing On-Demand for reliability, but the key insight is that checkpointing enables cheap, interruptible compute. Remember the memory tip: “Spot for savings, S3 for safety,” meaning Spot Instances cut costs while S3 checkpoints ensure you never lose progress.
SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. 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 batch processing job can be interrupted and restarted from checkpoints. The business wants to lower compute cost while still keeping the workload resilient to interruptions. Which two choices are best? Select two.
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
Run the workload on Amazon EC2 Spot Instances.
Amazon EC2 Spot Instances offer significant cost savings (up to 90% compared to On-Demand) and are ideal for fault-tolerant, stateless batch processing jobs that can be interrupted and restarted from checkpoints. The workload's ability to resume from checkpoints makes it resilient to Spot Instance interruptions, aligning perfectly with the business goal of lowering compute costs while maintaining resilience.
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.
- ✓
Run the workload on Amazon EC2 Spot Instances.
Why this is correct
Spot Instances are significantly cheaper than On-Demand capacity and are a good fit when the workload can tolerate interruption. Because the job can restart from checkpoints, interruptions are acceptable.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Store checkpoints in durable storage such as Amazon S3.
Why this is correct
Durable checkpoints allow the job to resume from the last saved state after an interruption. This avoids reprocessing all work from the beginning and makes interruption recovery practical.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a single On-Demand instance in one Availability Zone only.
Why it's wrong here
A single On-Demand instance does not provide strong interruption resilience and gives up the main cost advantage of Spot. It is also less tolerant of an AZ failure.
- ✗
Disable automatic replacement so the job is never restarted.
Why it's wrong here
Disabling replacement defeats resilience. If the instance is interrupted or fails, the batch job would remain down until someone manually intervenes.
- ✗
Keep all intermediate state only in instance memory.
Why it's wrong here
Instance memory is lost when the instance stops or is interrupted. Restartable batch jobs need durable checkpoint storage rather than ephemeral in-memory state only.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may overlook the synergy between Spot Instances and checkpointing, mistakenly thinking that any cost-saving measure (like a single On-Demand instance) suffices, or that resilience can be achieved without durable external storage for state.
Detailed technical explanation
How to think about this question
Spot Instances leverage spare EC2 capacity at discounted prices but can be reclaimed with a two-minute warning via the EC2 Instance Rebalance Recommendation. Checkpoints stored in durable storage like Amazon S3 allow the job to resume from the last saved state, effectively decoupling compute from state. This pattern is commonly used in distributed frameworks like Apache Spark or AWS Batch, where checkpointing to S3 enables seamless recovery and cost optimization.
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.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Resilient Architectures — This question tests Design Resilient Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Run the workload on Amazon EC2 Spot Instances. — Amazon EC2 Spot Instances offer significant cost savings (up to 90% compared to On-Demand) and are ideal for fault-tolerant, stateless batch processing jobs that can be interrupted and restarted from checkpoints. The workload's ability to resume from checkpoints makes it resilient to Spot Instance interruptions, aligning perfectly with the business goal of lowering compute costs while maintaining resilience.
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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