- A
Pilot light: keep only essential infrastructure in the secondary location and scale up the application during a failure.
Why wrong: Pilot light reduces cost by running only minimal components, but the application tier is not already running. That typically makes recovery slower than designs that keep a partial, production-like stack ready.
- B
Warm standby: run a minimal but functional version of the application and supporting services in the secondary location, and scale up during a failure.
Warm standby balances cost and recovery time by keeping some capacity running in the secondary environment (for example, smaller Auto Scaling capacity for the app tier and replication for the data tier). When the primary fails, you fail over and scale out quickly.
- C
Active-active: run full production in both the primary and secondary locations at the same time.
Why wrong: Active-active generally requires running full production workloads in both locations continuously. That is usually more expensive than the scenario described.
- D
Backup and restore only: rely on periodic backups and restore the application after a failure.
Why wrong: Backup and restore provides disaster recovery without keeping a ready environment. Recovery is typically significantly slower because you must provision/restore services and data after the incident.
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 company wants a disaster recovery setup for a web application. They need relatively quick recovery, but they can't afford running full production in the secondary location at all times. Which option best matches this requirement?
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
Warm standby: run a minimal but functional version of the application and supporting services in the secondary location, and scale up during a failure.
Warm standby (Option B) is correct because it runs a minimal but functional version of the application in the secondary region, allowing for faster recovery than a pilot light while avoiding the cost of full production. During a failure, you scale up the standby environment to handle production traffic, meeting the requirement for relatively quick recovery without the expense of active-active.
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.
- ✗
Pilot light: keep only essential infrastructure in the secondary location and scale up the application during a failure.
Why it's wrong here
Pilot light reduces cost by running only minimal components, but the application tier is not already running. That typically makes recovery slower than designs that keep a partial, production-like stack ready.
- ✓
Warm standby: run a minimal but functional version of the application and supporting services in the secondary location, and scale up during a failure.
Why this is correct
Warm standby balances cost and recovery time by keeping some capacity running in the secondary environment (for example, smaller Auto Scaling capacity for the app tier and replication for the data tier). When the primary fails, you fail over and scale out quickly.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Active-active: run full production in both the primary and secondary locations at the same time.
Why it's wrong here
Active-active generally requires running full production workloads in both locations continuously. That is usually more expensive than the scenario described.
- ✗
Backup and restore only: rely on periodic backups and restore the application after a failure.
Why it's wrong here
Backup and restore provides disaster recovery without keeping a ready environment. Recovery is typically significantly slower because you must provision/restore services and data after the incident.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing 'pilot light' with 'warm standby' — candidates often think pilot light is faster because it sounds minimal, but warm standby actually provides quicker recovery by having the application already deployed and ready to scale.
Trap categories for this question
Scenario analysis trap
Active-active generally requires running full production workloads in both locations continuously. That is usually more expensive than the scenario described.
Detailed technical explanation
How to think about this question
Warm standby typically uses a scaled-down version of the application (e.g., smaller EC2 instances, fewer read replicas) in the secondary region, with automated failover mechanisms like Route 53 health checks and AWS Elastic Disaster Recovery to promote the standby to active. The recovery time objective (RTO) is usually minutes to an hour, as opposed to pilot light which may require 10-30 minutes to provision compute, and backup/restore which can take hours. In practice, warm standby often involves pre-warming Auto Scaling groups and using Amazon Aurora Global Database for low-latency replication.
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: Warm standby: run a minimal but functional version of the application and supporting services in the secondary location, and scale up during a failure. — Warm standby (Option B) is correct because it runs a minimal but functional version of the application in the secondary region, allowing for faster recovery than a pilot light while avoiding the cost of full production. During a failure, you scale up the standby environment to handle production traffic, meeting the requirement for relatively quick recovery without the expense of active-active.
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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