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. A key principle to apply: multi-AZ provides synchronous replication to a standby instance in another 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 team wants the control to be enforceable during normal operations.
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 automatically provisions and synchronously replicates a standby instance in a different Availability Zone. In the event of an AZ failure, Amazon RDS automatically fails over to the standby, providing high availability with minimal application changes (the application only needs to reconnect using the same endpoint). This meets the requirement of remaining available during an AZ failure while being enforceable during normal operations.
Key principle: Multi-AZ provides synchronous replication to a standby instance in another 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 another 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 (which are for read offloading and disaster recovery across regions) with Multi-AZ deployments (which provide synchronous replication and automatic failover for high availability within a region).
Detailed technical explanation
How to think about this question
Multi-AZ RDS uses synchronous replication to the standby instance in a different AZ, ensuring zero data loss during failover (committed transactions are preserved). The failover is automatic and typically completes within 60-120 seconds, with the DNS endpoint automatically pointing to the new primary. In a real-world scenario, this is critical for payment APIs where even seconds of downtime can result in transaction failures or compliance violations.
KKey Concepts to Remember
Multi-AZ provides synchronous replication to a standby instance in another AZ.
Automatic failover to the standby occurs in case of primary DB instance failure or AZ outage.
The DB instance endpoint remains the same after failover, requiring no application changes.
Multi-AZ is a high availability feature, not primarily a read scaling solution.
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 another 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 another 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 another 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 automatically provisions and synchronously replicates a standby instance in a different Availability Zone. In the event of an AZ failure, Amazon RDS automatically fails over to the standby, providing high availability with minimal application changes (the application only needs to reconnect using the same endpoint). This meets the requirement of remaining available during an AZ failure while being enforceable during normal operations.
What should I do if I get this SAA-C03 question wrong?
Review multi-AZ provides synchronous replication to a standby instance in another 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 another AZ.
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Question Discussion
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