DBS-C01 Cross-Region Replication Practice Question
Which THREE of the following are required to set up cross-Region replication for an Amazon RDS for MySQL DB instance? (Choose THREE.)
⚠ Common exam trap
A common trap is to select both option A and option D as separate requirements. In reality, enabling automated backups (option D) essentially requires a non-zero backup retention period (such as 1 day), so they represent the same requirement. The exam expects you to recognize that the fundamental requirement is having automated backups enabled, not the specific retention period value. Another trap is thinking that Multi-AZ deployment is required, but it is not.
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 source DB instance must have automated backups enabled (option D). This is typically achieved by setting a backup retention period of at least 1 day (option A is not a separate requirement; it is the mechanism to enable automated backups). The source DB instance must be in a VPC (option B), and a read replica must be created in the target Region (option C). Multi-AZ deployment (option E) is not required.
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.
- ✓
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.
- ✓
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.
- ✗
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.