- A
Single-AZ DB deployment and rely on manual snapshot restore during failures.
Why wrong: Single-AZ deployments do not provide an always-on standby in another AZ. Manual snapshot restore is a recovery process that requires intervention and is typically not an automatic failover to an AZ-level standby.
- B
Multi-AZ deployment with an automatically managed standby in a different Availability Zone and automatic failover.
RDS/Aurora Multi-AZ deployments maintain a standby instance in a separate AZ. When configured for Multi-AZ, RDS/Aurora can perform automatic failover to the standby, meeting both the “different AZ” and “automatic failover” requirements.
- C
Enable read replicas only, and promote a replica manually when the primary fails.
Why wrong: Read replicas are for scaling reads and do not provide the same high-availability failover behavior as Multi-AZ deployments. Manual promotion adds recovery time and does not meet the automatic failover requirement.
- D
Enable point-in-time recovery (PITR) without configuring any Multi-AZ standby.
Why wrong: PITR helps recover from logical mistakes (for example, accidental writes/deletes) by restoring data to an earlier time, but it does not provide an automatically available standby in another AZ for failover.
SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 team needs a relational database solution that can automatically fail over to a standby instance if the primary database becomes unavailable. They want the standby to be located in a different Availability Zone. Which RDS/Aurora configuration best satisfies this requirement?
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.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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
Multi-AZ deployment with an automatically managed standby in a different Availability Zone and automatic failover.
Option B is correct because a Multi-AZ RDS deployment automatically provisions and maintains a standby instance in a different Availability Zone, and the failover is handled automatically by AWS without manual intervention. This meets the requirement for automatic failover to a standby in a different AZ, which is the core purpose of Multi-AZ deployments.
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.
- ✗
Single-AZ DB deployment and rely on manual snapshot restore during failures.
Why it's wrong here
Single-AZ deployments do not provide an always-on standby in another AZ. Manual snapshot restore is a recovery process that requires intervention and is typically not an automatic failover to an AZ-level standby.
- ✓
Multi-AZ deployment with an automatically managed standby in a different Availability Zone and automatic failover.
Why this is correct
RDS/Aurora Multi-AZ deployments maintain a standby instance in a separate AZ. When configured for Multi-AZ, RDS/Aurora can perform automatic failover to the standby, meeting both the “different AZ” and “automatic failover” requirements.
Clue confirmation
The clue words "best", "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable read replicas only, and promote a replica manually when the primary fails.
Why it's wrong here
Read replicas are for scaling reads and do not provide the same high-availability failover behavior as Multi-AZ deployments. Manual promotion adds recovery time and does not meet the automatic failover requirement.
- ✗
Enable point-in-time recovery (PITR) without configuring any Multi-AZ standby.
Why it's wrong here
PITR helps recover from logical mistakes (for example, accidental writes/deletes) by restoring data to an earlier time, but it does not provide an automatically available standby in another AZ for failover.
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 standby, thinking that promoting a read replica provides automatic failover, but read replicas require manual promotion and do not serve as a synchronous standby.
Detailed technical explanation
How to think about this question
In a Multi-AZ RDS deployment, the primary and standby instances use synchronous replication to the block level, ensuring zero data loss during failover. The failover is triggered by DNS record updates (CNAME) pointing to the standby's endpoint, typically completing within 60-120 seconds. For Aurora, the Multi-AZ concept is built-in with six copies of data across three AZs, but the question specifically asks about RDS/Aurora configurations, and the standard Multi-AZ RDS deployment directly matches the described requirement.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
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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: Multi-AZ deployment with an automatically managed standby in a different Availability Zone and automatic failover. — Option B is correct because a Multi-AZ RDS deployment automatically provisions and maintains a standby instance in a different Availability Zone, and the failover is handled automatically by AWS without manual intervention. This meets the requirement for automatic failover to a standby in a different AZ, which is the core purpose of Multi-AZ deployments.
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", "primary". 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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Last reviewed: Jun 11, 2026
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