The answer is a Multi-AZ deployment with synchronous replication. This configuration meets the strict RPO of less than 5 seconds and RTO under 1 minute because synchronous replication ensures every write is committed to both the primary and standby instances in separate Availability Zones before the transaction is acknowledged, effectively driving the RPO to near zero. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of how RDS Multi-AZ disaster recovery differs from asynchronous replication options like cross-Region read replicas, which cannot guarantee such low RPO and RTO. A common trap is confusing Multi-AZ with Multi-Region—remember that Multi-AZ handles AZ-level failures with automatic failover, while Multi-Region addresses regional disasters but introduces higher latency and RPO. Memory tip: “Sync for zero, async for far”—synchronous replication in Multi-AZ gives you the lowest possible RPO and RTO for critical workloads.
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 disaster recovery plan for a critical application that runs on Amazon RDS for PostgreSQL. The application requires a Recovery Point Objective (RPO) of less than 5 seconds and a Recovery Time Objective (RTO) of less than 1 minute. Which RDS deployment option meets these requirements?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A Multi-AZ deployment with synchronous replication.
Amazon RDS Multi-AZ deployments with synchronous replication provide automatic failover to a standby instance in a different Availability Zone, ensuring data is committed to both primary and standby before acknowledging a write. This achieves an RPO of effectively zero (less than 5 seconds) and an RTO typically under 1 minute, meeting the stated requirements.
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.
✗
A single-AZ deployment with cross-Region automated backups.
Why it's wrong here
Cross-Region backups have higher RPO and RTO.
✗
A single-AZ deployment with a standby instance manually promoted.
Why it's wrong here
Manual promotion would exceed the 1-minute RTO.
✓
A Multi-AZ deployment with synchronous replication.
Why this is correct
Multi-AZ provides synchronous replication and automatic failover.
Related concept
Read the scenario before looking for a memorised answer.
✗
A Multi-AZ deployment with a Read Replica in a different Region.
Why it's wrong here
Read Replicas are not used for automatic failover.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing Multi-AZ synchronous replication (which provides automatic failover and near-zero RPO) with cross-Region Read Replicas (which use asynchronous replication and require manual promotion, thus failing both RPO and RTO requirements).
Detailed technical explanation
How to think about this question
RDS Multi-AZ uses synchronous replication at the storage layer (not PostgreSQL logical replication), meaning the database engine waits for the standby to acknowledge the write before returning a commit to the client. The failover is automated via DNS record update and typically completes within 60–120 seconds, but for RTO under 1 minute, you must also consider application connection retry logic and DNS caching. In practice, the RPO is near-zero because synchronous replication ensures no data loss on failure, but a simultaneous failure of both AZs could still cause loss of in-flight transactions.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Technology — This question tests Technology — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A Multi-AZ deployment with synchronous replication. — Amazon RDS Multi-AZ deployments with synchronous replication provide automatic failover to a standby instance in a different Availability Zone, ensuring data is committed to both primary and standby before acknowledging a write. This achieves an RPO of effectively zero (less than 5 seconds) and an RTO typically under 1 minute, meeting the stated requirements.
What should I do if I get this PAS-C01 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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Question Discussion
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