- A
Single-AZ with a Read Replica in the same region
Why wrong: Read Replicas do not provide automatic failover.
- B
Multi-AZ deployment with synchronous replication to a cross-region replica
Why wrong: Cross-region replicas are for disaster recovery, not automatic failover.
- C
Multi-AZ deployment with a standby replica in a different Availability Zone
Multi-AZ provides automatic failover.
- D
Single-AZ with automated backups
Why wrong: No automatic failover.
Question 778 of 1,730
DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. 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.
A company is deploying a new application that uses Amazon RDS for MySQL. The database must be highly available with automatic failover. Which deployment configuration meets these requirements?
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 a standby replica in a different Availability Zone
Option C is correct because a Multi-AZ deployment for Amazon RDS for MySQL automatically provisions and maintains a synchronous standby replica in a different Availability Zone. In the event of a failure, Amazon RDS automatically fails over to the standby, providing high availability without manual intervention. This configuration meets the requirement for automatic failover and high availability within a single AWS region.
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 with a Read Replica in the same region
Why it's wrong here
Read Replicas do not provide automatic failover.
- ✗
Multi-AZ deployment with synchronous replication to a cross-region replica
Why it's wrong here
Cross-region replicas are for disaster recovery, not automatic failover.
- ✓
Multi-AZ deployment with a standby replica in a different Availability Zone
Why this is correct
Multi-AZ provides automatic failover.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Single-AZ with automated backups
Why it's wrong here
No automatic failover.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Read Replicas (which are asynchronous and used for read scaling) with Multi-AZ standby replicas (which are synchronous and used for high availability), leading them to incorrectly select Option A as a valid high-availability solution.
Detailed technical explanation
How to think about this question
In a Multi-AZ deployment, Amazon RDS uses synchronous replication to maintain a standby instance in a different Availability Zone, ensuring zero data loss during failover. The failover process is automatic and typically completes within 60-120 seconds, during which the DNS record for the DB instance is updated to point to the standby. Under the hood, Amazon RDS manages the replication and monitoring using a combination of Amazon CloudWatch health checks and a heartbeat mechanism between the primary and standby.
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 DBS-C01 question test?
Deployment and Migration — This question tests Deployment and Migration — 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 a standby replica in a different Availability Zone — Option C is correct because a Multi-AZ deployment for Amazon RDS for MySQL automatically provisions and maintains a synchronous standby replica in a different Availability Zone. In the event of a failure, Amazon RDS automatically fails over to the standby, providing high availability without manual intervention. This configuration meets the requirement for automatic failover and high availability within a single AWS region.
What should I do if I get this DBS-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 DBS-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 DBS-C01 exam.
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