- A
Pilot light
Pilot light keeps a minimal version of the environment running in the backup Region, which helps reduce cost while still supporting recovery.
- B
Active-active
Why wrong: Active-active keeps both Regions serving traffic, which is usually more expensive than the requirement described.
- C
Single-AZ deployment
Why wrong: A single-AZ deployment does not protect against a complete Regional outage and is less resilient overall.
- D
Blue/green deployment
Why wrong: Blue/green is mainly a deployment technique, not a full multi-Region disaster recovery strategy.
Question 991 of 1,040
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure 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 to protect a critical application from a full Region outage. The secondary Region should keep only a small amount of infrastructure running most of the time to control cost. Which disaster recovery strategy fits best?
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
✓
Pilot light
The pilot light strategy is correct because it keeps a minimal core of infrastructure (e.g., a small database, a few EC2 instances) running in the secondary Region, while the bulk of the application remains dormant. In a full Region outage, the pilot light can be rapidly scaled up to full production capacity, meeting the requirement of low ongoing cost with the ability to recover from a complete Region failure.
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
Why this is correct
Pilot light keeps a minimal version of the environment running in the backup Region, which helps reduce cost while still supporting recovery.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Active-active
Why it's wrong here
Active-active keeps both Regions serving traffic, which is usually more expensive than the requirement described.
When this WOULD be correct
Active-active would be correct for a scenario requiring zero downtime and immediate failover, where the application must serve traffic from multiple regions concurrently to handle high availability and low latency, and cost is not a primary constraint.
- ✗
Single-AZ deployment
Why it's wrong here
A single-AZ deployment does not protect against a complete Regional outage and is less resilient overall.
When this WOULD be correct
This option would be correct for a question asking for a cost-effective deployment that maximizes availability within a single Region, where the application can tolerate a single AZ failure and the goal is to minimize complexity and cost.
- ✗
Blue/green deployment
Why it's wrong here
Blue/green is mainly a deployment technique, not a full multi-Region disaster recovery strategy.
When this WOULD be correct
A company wants to deploy a new version of an application with zero downtime and the ability to quickly roll back if issues arise. Blue/green deployment would be the correct answer.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓Pilot lightCorrect answer▾
Why this is correct
Pilot light keeps a minimal version of the environment running in the backup Region, which helps reduce cost while still supporting recovery.
✗Active-activeWrong answer — click to see why▾
Why this is wrong here
Active-active runs full production workloads in both regions simultaneously, which does not minimize infrastructure in the secondary region and increases cost, contrary to the requirement to keep only a small amount of infrastructure running most of the time.
★ When this WOULD be the correct answer
Active-active would be correct for a scenario requiring zero downtime and immediate failover, where the application must serve traffic from multiple regions concurrently to handle high availability and low latency, and cost is not a primary constraint.
Why candidates choose this
Candidates may choose active-active because it provides high availability and fast failover, but they overlook the cost implication of running full infrastructure in both regions, which contradicts the cost control requirement.
✗Single-AZ deploymentWrong answer — click to see why▾
Why this is wrong here
Single-AZ deployment provides no protection against a full Region outage because it operates within a single Availability Zone. The question requires cross-Region disaster recovery, which this option does not address.
★ When this WOULD be the correct answer
This option would be correct for a question asking for a cost-effective deployment that maximizes availability within a single Region, where the application can tolerate a single AZ failure and the goal is to minimize complexity and cost.
Why candidates choose this
Candidates may think that deploying in a single AZ is sufficient for basic high availability, or they confuse AZ-level redundancy with Region-level disaster recovery, overlooking the requirement for cross-Region protection.
✗Blue/green deploymentWrong answer — click to see why▾
Why this is wrong here
Blue/green deployment is a release strategy for updating applications with minimal downtime, not a disaster recovery strategy for region outages. It does not address infrastructure in a secondary region.
★ When this WOULD be the correct answer
A company wants to deploy a new version of an application with zero downtime and the ability to quickly roll back if issues arise. Blue/green deployment would be the correct answer.
Why candidates choose this
Candidates may confuse blue/green deployment with failover scenarios because both involve switching between environments, but blue/green is for updates, not disaster recovery.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'pilot light' with 'active-active' or 'warm standby,' mistakenly thinking that any multi-Region setup must run full capacity, when the pilot light specifically minimizes cost by keeping only a minimal footprint until failover is triggered.
Detailed technical explanation
How to think about this question
In a pilot light setup, the secondary Region typically runs a minimal stack—such as a replicated RDS instance or a small EC2 instance with critical data—using Route 53 DNS failover to redirect traffic. The recovery process involves scaling out the pilot light environment via Auto Scaling groups and pre-configured AMIs, often achieving RTOs of minutes to hours. A real-world scenario is a financial application that replicates its database to a secondary Region using cross-Region read replicas, keeping only the database and a single application server running to minimize costs while ensuring data durability.
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
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Pilot light — The pilot light strategy is correct because it keeps a minimal core of infrastructure (e.g., a small database, a few EC2 instances) running in the secondary Region, while the bulk of the application remains dormant. In a full Region outage, the pilot light can be rapidly scaled up to full production capacity, meeting the requirement of low ongoing cost with the ability to recover from a complete Region failure.
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.
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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