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Read the full NAT/PAT explanation →Question 170 of 1,040
Quick Answer
The answer is to combine an Auto Scaling group spanning three Availability Zones, an Aurora cluster with at least one replica in a different AZ, an Application Load Balancer, and Amazon RDS Proxy. This architecture ensures availability zone failure resilience on AWS by distributing compute and database resources across multiple isolated locations, so if one AZ fails, the ALB automatically routes traffic to healthy EC2 instances, the Auto Scaling group launches replacements in remaining AZs, and Aurora’s automatic failover promotes a replica in under 30 seconds—all without manual intervention. On the SAA-C03 exam, this scenario tests your understanding of layered resilience: many candidates forget RDS Proxy’s role in maintaining database connections during failover, or incorrectly assume two AZs are sufficient for Aurora’s quorum-based replication. A common trap is choosing a Multi-AZ DB instance instead of an Aurora cluster with replicas, which lacks the same rapid failover and read scaling. Remember the mnemonic “A3-RAP” for Auto Scaling, Aurora, ALB, and Proxy—the four pillars of AZ failure resilience.
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 solutions architect is designing a highly available and resilient architecture for a critical internal application that processes financial transactions. The application runs on Amazon EC2 instances inside an Auto Scaling group. The database layer uses an Amazon Aurora MySQL cluster. The company requires that if an entire AWS Availability Zone (AZ) fails, the application must remain operational with minimal impact and automatically recover without manual intervention. Which combination of architectural decisions will meet these requirements? (Choose four.)
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
✓
Configure the Auto Scaling group to span at least three Availability Zones in the same AWS Region.
Configuring the Auto Scaling group to span at least three Availability Zones ensures that if one AZ fails, the remaining AZs have sufficient capacity to handle the load, and the Auto Scaling group can automatically launch new instances in the healthy AZs. Deploying the Aurora cluster with at least one Aurora Replica in a different AZ than the primary instance provides automatic failover to a replica in under 30 seconds, ensuring database resilience without manual intervention. Using an Application Load Balancer (ALB) to distribute traffic across EC2 instances in multiple AZs allows the ALB to automatically route traffic away from failed AZs and only to healthy targets, maintaining application availability. Setting up an Amazon RDS Proxy manages database connections by pooling and reusing them, which reduces the load on the database during failover and improves resilience by providing seamless connection handling across AZ failures.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think a single Aurora instance with multi-AZ storage is sufficient, but without an Aurora Replica in a different AZ, automatic failover is not possible; similarly, they may assume that placing all EC2 instances in one AZ simplifies data locality, but this sacrifices availability for a false sense of performance optimization.
Detailed technical explanation
How to think about this question
Aurora Replicas share the same underlying storage volume as the primary instance, so failover is fast (typically under 30 seconds) because no data needs to be copied. The ALB performs health checks on targets and only routes traffic to healthy instances, which is critical for automatically recovering from AZ failures. RDS Proxy maintains a warm connection pool to the database, so during a failover, client connections are transparently redirected to the new primary without requiring application-side reconnection logic.
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 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: Configure the Auto Scaling group to span at least three Availability Zones in the same AWS Region. — Configuring the Auto Scaling group to span at least three Availability Zones ensures that if one AZ fails, the remaining AZs have sufficient capacity to handle the load, and the Auto Scaling group can automatically launch new instances in the healthy AZs. Deploying the Aurora cluster with at least one Aurora Replica in a different AZ than the primary instance provides automatic failover to a replica in under 30 seconds, ensuring database resilience without manual intervention. Using an Application Load Balancer (ALB) to distribute traffic across EC2 instances in multiple AZs allows the ALB to automatically route traffic away from failed AZs and only to healthy targets, maintaining application availability. Setting up an Amazon RDS Proxy manages database connections by pooling and reusing them, which reduces the load on the database during failover and improves resilience by providing seamless connection handling across AZ failures.
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
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.
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