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. A key principle to apply: multi-AZ provides synchronous replication to a standby instance in a different AZ.. 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 API uses an RDS MySQL database and must remain available during an Availability Zone failure with minimal application changes. What should the architect enable? The architecture review board prefers a managed AWS-native control.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Multi-AZ deployment for the RDS DB instance
Multi-AZ deployment for RDS MySQL provides synchronous standby replication to a different Availability Zone, ensuring automatic failover with zero data loss (RPO=0) and minimal downtime (RTO typically under 2 minutes) during an AZ failure. This is a managed AWS-native solution that requires no application changes beyond updating the connection string to use the CNAME endpoint.
Key principle: Multi-AZ provides synchronous replication to a standby instance in a different AZ.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
S3 Cross-Region Replication
Why it's wrong here
S3 CRR applies to S3 objects, not RDS failover.
✓
Multi-AZ deployment for the RDS DB instance
Why this is correct
Multi-AZ provides synchronous standby replication and automatic failover within a Region.
Related concept
Multi-AZ provides synchronous replication to a standby instance in a different AZ.
✗
Read replicas only
Why it's wrong here
Read replicas improve read scalability and can support DR, but they are not the primary automatic AZ failover feature.
✗
EBS snapshots every hour
Why it's wrong here
Snapshots help recovery but do not provide automatic high availability.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse read replicas with Multi-AZ, assuming read replicas can provide high availability, but they lack automatic failover and synchronous replication, making them unsuitable for AZ failure scenarios requiring minimal application changes.
Detailed technical explanation
How to think about this question
Multi-AZ RDS uses synchronous replication to a standby instance in a different AZ, with the primary writing to two storage volumes simultaneously; during failover, RDS flips the DNS CNAME to point to the standby, and the MySQL engine automatically replays any in-flight transactions. A subtle behavior is that the standby cannot be used for reads unless you enable Multi-AZ with two readable standbys (a newer feature), but the standard Multi-AZ standby is not accessible for queries.
KKey Concepts to Remember
Multi-AZ provides synchronous replication to a standby instance in a different AZ.
Automatic failover to the standby instance occurs during primary AZ failure.
The DB instance endpoint remains the same after failover.
Multi-AZ is a high availability solution, not primarily for read scaling.
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
Multi-AZ provides synchronous replication to a standby instance in a different AZ.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review multi-AZ provides synchronous replication to a standby instance in a different AZ., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Design Resilient Architectures — This question tests Design Resilient Architectures — Multi-AZ provides synchronous replication to a standby instance in a different AZ..
What is the correct answer to this question?
The correct answer is: Multi-AZ deployment for the RDS DB instance — Multi-AZ deployment for RDS MySQL provides synchronous standby replication to a different Availability Zone, ensuring automatic failover with zero data loss (RPO=0) and minimal downtime (RTO typically under 2 minutes) during an AZ failure. This is a managed AWS-native solution that requires no application changes beyond updating the connection string to use the CNAME endpoint.
What should I do if I get this SAA-C03 question wrong?
Review multi-AZ provides synchronous replication to a standby instance in a different AZ., then practise related SAA-C03 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Multi-AZ provides synchronous replication to a standby instance in a different AZ.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.