- A
The backup retention period on the source must be at least 1 day.
Why wrong: Correct. The backup retention period must be at least 1 day to enable automated backups, which are needed for replication.
- B
The source DB instance must be in a VPC.
Correct. The source DB instance must be in a VPC to allow network connectivity for cross-Region replication.
- C
A read replica must be created in the target Region.
Correct. A read replica must be created in the target Region to receive the replicated data.
- D
Automated backups must be enabled on the source DB instance.
Incorrect. Automated backups are automatically enabled when the backup retention period is set to at least 1 day, so this is not a separate requirement.
- E
The source DB instance must be a Multi-AZ deployment.
Why wrong: Multi-AZ is not a requirement for cross-Region replication; it is used for high availability within a single Region.
DBS-C01 Cross-Region Replication Practice Question
This DBS-C01 practice question tests your understanding of management and operations. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. A key principle to apply: cross-Region Replication. 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 THREE of the following are required to set up cross-Region replication for an Amazon RDS for MySQL DB instance? (Choose THREE.)
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
The source DB instance must be in a VPC.
For cross-Region replication of an Amazon RDS for MySQL DB instance, the following are required: the backup retention period on the source must be at least 1 day (option A), the source DB instance must be in a VPC (option B), and a read replica must be created in the target Region (option C). Option D (automated backups must be enabled) is not a separate requirement because when the backup retention period is set to at least 1 day, automated backups are automatically enabled. Thus, only A, B, and C are required.
Key principle: Cross-Region Replication
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The backup retention period on the source must be at least 1 day.
Why it's wrong here
Correct. The backup retention period must be at least 1 day to enable automated backups, which are needed for replication.
- ✓
The source DB instance must be in a VPC.
Why this is correct
Correct. The source DB instance must be in a VPC to allow network connectivity for cross-Region replication.
Related concept
Cross-Region Replication
- ✓
A read replica must be created in the target Region.
Why this is correct
Correct. A read replica must be created in the target Region to receive the replicated data.
Related concept
Cross-Region Replication
- ✓
Automated backups must be enabled on the source DB instance.
Why this is correct
Incorrect. Automated backups are automatically enabled when the backup retention period is set to at least 1 day, so this is not a separate requirement.
Related concept
Cross-Region Replication
- ✗
The source DB instance must be a Multi-AZ deployment.
Why it's wrong here
Multi-AZ is not a requirement for cross-Region replication; it is used for high availability within a single Region.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common trap is assuming that automated backups being enabled is a separate requirement, but it is automatically satisfied when the backup retention period is at least 1 day. Another trap is thinking that Multi-AZ deployment is required, but it is not.
Detailed technical explanation
How to think about this question
Cross-Region replication for Amazon RDS MySQL uses asynchronous replication based on binary log (binlog) file position or GTID-based replication. The source instance must have automated backups enabled to generate and retain binlogs, which are then streamed to the read replica in the target Region. The backup retention period of at least 1 day ensures that binlogs are not purged before the replica can catch up, especially during network interruptions or lag.
KKey Concepts to Remember
- Cross-Region Replication
- Automated Backups
- Read Replica
- VPC
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
Cross-Region Replication
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Review cross-Region Replication, then practise related DBS-C01 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Management and Operations — This question tests Management and Operations — Cross-Region Replication.
What is the correct answer to this question?
The correct answer is: The source DB instance must be in a VPC. — For cross-Region replication of an Amazon RDS for MySQL DB instance, the following are required: the backup retention period on the source must be at least 1 day (option A), the source DB instance must be in a VPC (option B), and a read replica must be created in the target Region (option C). Option D (automated backups must be enabled) is not a separate requirement because when the backup retention period is set to at least 1 day, automated backups are automatically enabled. Thus, only A, B, and C are required.
What should I do if I get this DBS-C01 question wrong?
Review cross-Region Replication, then practise related DBS-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Cross-Region Replication
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Last reviewed: Jun 24, 2026
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