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Question 8 of 1,040

Design Resilient Architectures →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is warm standby. This strategy is the correct choice because it maintains a partially provisioned environment in the secondary Region with core infrastructure—such as a smaller EC2 Auto Scaling group and a standby database using frequent replication—which directly supports an RPO of 15 minutes and an RTO of about 1 hour, while avoiding the full cost of duplicate capacity. On the SAA-C03 exam, this scenario tests your ability to distinguish between pilot light, which requires manual scaling and a slower rebuild, and warm standby, which offers automated readiness and guided failover. A common trap is choosing pilot light because it seems cheaper, but the requirement for automated readiness and a 1-hour RTO disqualifies it. Memory tip: think of warm standby as a "warm engine" that is idling and ready to accelerate, whereas pilot light is just a spark that needs fuel and time to ignite.

SAA-C03 Design Resilient Architectures Practice Question

This SAA-C03 practice question tests your understanding of design resilient architectures. 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 payments platform requires disaster recovery across Regions. Requirements: RPO of 15 minutes and RTO of about 1 hour. The business cannot afford full duplicate capacity in both Regions all the time, but the team wants automated readiness so failover is mostly operationally guided rather than a slow rebuild. Which DR strategy is the best fit?

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.

Question 1mediummultiple choice

Full question →

A
Backup and restore only, relying on scheduled snapshots and manual restores during incidents.
Why wrong: Backup/restore can meet data-loss tolerance in some cases, but RTO of 1 hour is often too aggressive for manual restores.
B
Pilot light, keeping only minimal infrastructure in the secondary Region and starting full services after failover.
Why wrong: Pilot light is cheaper, but RTO of 1 hour may not be achievable if full compute/services must be brought up from near-zero.
C
Warm standby, keeping core infrastructure and a partially provisioned environment ready in the secondary Region with frequent data replication.
Warm standby balances cost and readiness by keeping enough capacity and services running to shorten recovery time while meeting RPO needs.
D
Active/active, routing production traffic to both Regions continuously and accepting dual-region complexity.
Why wrong: Active/active best fits very low RTO and high availability, but it usually costs more than the stated budget constraints.

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

✓

Warm standby, keeping core infrastructure and a partially provisioned environment ready in the secondary Region with frequent data replication.

Warm standby is the best fit because it maintains a partially provisioned environment in the secondary Region with core infrastructure (e.g., a smaller EC2 Auto Scaling group, a standby database with synchronous or asynchronous replication) and frequent data replication, enabling an RPO of 15 minutes and an RTO of about 1 hour. This approach balances cost and automated readiness, as the team can scale up the standby environment during failover without the expense of full duplicate capacity, while still meeting the recovery objectives through automated replication (e.g., Amazon RDS Multi-AZ cross-Region or DynamoDB global tables).

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.

✗
Backup and restore only, relying on scheduled snapshots and manual restores during incidents.
Why it's wrong here
Backup/restore can meet data-loss tolerance in some cases, but RTO of 1 hour is often too aggressive for manual restores.
✗
Pilot light, keeping only minimal infrastructure in the secondary Region and starting full services after failover.
Why it's wrong here
Pilot light is cheaper, but RTO of 1 hour may not be achievable if full compute/services must be brought up from near-zero.
✓
Warm standby, keeping core infrastructure and a partially provisioned environment ready in the secondary Region with frequent data replication.
Why this is correct
Warm standby balances cost and readiness by keeping enough capacity and services running to shorten recovery time while meeting RPO needs.
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, routing production traffic to both Regions continuously and accepting dual-region complexity.
Why it's wrong here
Active/active best fits very low RTO and high availability, but it usually costs more than the stated budget constraints.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse pilot light with warm standby, assuming minimal infrastructure is sufficient for a 1-hour RTO, but pilot light's need to provision and configure full services after failover typically pushes RTO beyond 1 hour, whereas warm standby's partially provisioned environment allows faster scaling.

Detailed technical explanation

How to think about this question

Under the hood, warm standby often uses Amazon RDS cross-Region read replicas with MySQL or PostgreSQL asynchronous replication to achieve an RPO of seconds to minutes, while the standby environment runs a scaled-down version of the application stack (e.g., a single EC2 instance behind an Application Load Balancer) that can be scaled up via Auto Scaling or pre-warmed AMIs. A subtle behavior is that the RTO depends on the time to promote the read replica to a standalone database and update DNS (e.g., Route 53 failover routing), which can be automated with AWS Lambda or AWS Systems Manager Automation to stay within the 1-hour window.

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 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, keeping core infrastructure and a partially provisioned environment ready in the secondary Region with frequent data replication. — Warm standby is the best fit because it maintains a partially provisioned environment in the secondary Region with core infrastructure (e.g., a smaller EC2 Auto Scaling group, a standby database with synchronous or asynchronous replication) and frequent data replication, enabling an RPO of 15 minutes and an RTO of about 1 hour. This approach balances cost and automated readiness, as the team can scale up the standby environment during failover without the expense of full duplicate capacity, while still meeting the recovery objectives through automated replication (e.g., Amazon RDS Multi-AZ cross-Region or DynamoDB global tables).

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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Same concept, more angles

1 more ways this is tested on SAA-C03

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. A payments platform requires disaster recovery across Regions. Requirements: RPO of 15 minutes and RTO of about 1 hour. The business cannot afford full duplicate capacity in both Regions all the time, but the team wants automated readiness so failover is mostly operationally guided rather than a slow rebuild. Which DR strategy is the best fit?

medium

A.Backup and restore only, relying on scheduled snapshots and manual restores during incidents.
B.Pilot light, keeping only minimal infrastructure in the secondary Region and starting full services after failover.
✓ C.Warm standby, keeping core infrastructure and a partially provisioned environment ready in the secondary Region with frequent data replication.
D.Active/active, routing production traffic to both Regions continuously and accepting dual-region complexity.

Why C: Warm standby is the best fit because it maintains a partially provisioned environment in the secondary Region with core infrastructure (e.g., a smaller EC2 instance fleet, a replicated database) and uses frequent data replication (e.g., Amazon RDS cross-Region replication or DynamoDB global tables) to achieve an RPO of 15 minutes. The RTO of about 1 hour is achievable by scaling up the standby environment and redirecting traffic, which is faster than a full rebuild but avoids the cost of full duplicate capacity. This balances the business constraint of not affording active/active with the need for automated readiness and guided failover.

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This SAA-C03 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 SAA-C03 exam.