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 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 claims workflow 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 provides synchronous standby replication across two Availability Zones. In the event of an AZ failure, Amazon RDS automatically fails over to the standby in the other AZ, ensuring availability with minimal application changes (the same database endpoint is used). This meets the requirement for enforceability during normal operations because Multi-AZ is always active, not a manual or scheduled process.
Key principle: Multi-AZ provides synchronous replication to a standby 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 in another AZ.
✗
EBS snapshots every hour
Why it's wrong here
Snapshots help recovery but do not provide automatic high availability.
✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse read replicas (which only handle read traffic and require manual promotion) with Multi-AZ (which provides automatic failover for both reads and writes), or they assume EBS snapshots provide high availability rather than just backup.
Detailed technical explanation
How to think about this question
Under the hood, Multi-AZ RDS uses synchronous replication to a standby instance in a different AZ, with a DNS CNAME update to the standby during failover. The failover typically completes within 1-2 minutes, and the same database endpoint is preserved, so applications only need to re-establish connections. A real-world scenario: during an AWS AZ outage, Multi-AZ RDS automatically promotes the standby, avoiding the need for manual intervention or DNS changes.
KKey Concepts to Remember
Multi-AZ provides synchronous replication to a standby in another AZ.
Automatic failover occurs to the standby in case of primary AZ failure.
The DB instance endpoint remains the same after failover.
Multi-AZ is designed for high availability and disaster recovery within a Region.
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 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 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 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 provides synchronous standby replication across two Availability Zones. In the event of an AZ failure, Amazon RDS automatically fails over to the standby in the other AZ, ensuring availability with minimal application changes (the same database endpoint is used). This meets the requirement for enforceability during normal operations because Multi-AZ is always active, not a manual or scheduled process.
What should I do if I get this SAA-C03 question wrong?
Review multi-AZ provides synchronous replication to a standby 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 in another AZ.
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Question Discussion
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