- A
Read replicas in the same region for offloading read traffic.
Why wrong: Read replicas are a separate feature from Multi-AZ.
- B
Automatic failover to a standby instance in case of an AZ failure.
Multi-AZ automatically fails over to the standby in another AZ.
- C
A standby instance that is not accessible for reads or writes.
The standby is passive and only used for failover.
- D
Automatic storage scaling based on usage.
Why wrong: Storage scaling is separate, not part of Multi-AZ.
- E
Synchronous replication across AWS Regions.
Why wrong: Multi-AZ replicates within a single region, not cross-region.
Question 533 of 1,786
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Which TWO of the following are features of Amazon RDS Multi-AZ deployments? (Choose 2.)
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
✓
Automatic failover to a standby instance in case of an AZ failure.
Option B is correct because Amazon RDS Multi-AZ deployments automatically handle failover to a standby instance in a different Availability Zone when the primary instance fails or the AZ becomes unavailable. This synchronous replication ensures zero data loss and minimal downtime, with the standby instance automatically promoted to primary without manual intervention.
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.
- ✗
Read replicas in the same region for offloading read traffic.
Why it's wrong here
Read replicas are a separate feature from Multi-AZ.
- ✓
Automatic failover to a standby instance in case of an AZ failure.
Why this is correct
Multi-AZ automatically fails over to the standby in another AZ.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
A standby instance that is not accessible for reads or writes.
Why this is correct
The standby is passive and only used for failover.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Automatic storage scaling based on usage.
Why it's wrong here
Storage scaling is separate, not part of Multi-AZ.
- ✗
Synchronous replication across AWS Regions.
Why it's wrong here
Multi-AZ replicates within a single region, not cross-region.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The DEA-C01 exam often tests the distinction between Multi-AZ (high availability with a passive standby) and read replicas (scaling reads with active replicas), leading candidates to incorrectly associate read offloading with Multi-AZ deployments.
Detailed technical explanation
How to think about this question
Amazon RDS Multi-AZ uses synchronous replication to maintain a standby instance in a different AZ, with the primary synchronously committing writes to both instances before acknowledging the transaction. This ensures Recovery Point Objective (RPO) of zero and a typical failover time of 1-2 minutes, during which DNS records are updated to point to the standby. In practice, this is critical for production databases requiring high availability, such as e-commerce platforms, where even seconds of downtime can cause significant revenue loss.
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.
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Data Store Management — study guide chapter
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Automatic failover to a standby instance in case of an AZ failure. — Option B is correct because Amazon RDS Multi-AZ deployments automatically handle failover to a standby instance in a different Availability Zone when the primary instance fails or the AZ becomes unavailable. This synchronous replication ensures zero data loss and minimal downtime, with the standby instance automatically promoted to primary without manual intervention.
What should I do if I get this DEA-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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Last reviewed: Jul 4, 2026
This DEA-C01 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 DEA-C01 exam.
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