CV0-004 Operations and Support Practice Question
A company uses AWS and wants to implement a disaster recovery plan with an RTO of 4 hours and RPO of 1 hour. They have a primary site in us-east-1 and a DR site in us-west-2. The application data is stored in Amazon RDS for MySQL. Which strategy meets both RTO and RPO with minimal data loss?
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
✓
Create a cross-region read replica in us-west-2 and promote it during failover.
Cross-region read replicas for Amazon RDS provide asynchronous replication with a typical RPO of less than 5 minutes, easily meeting the 1-hour requirement. In a disaster, you can promote the replica to a primary instance within minutes, meeting the 4-hour RTO.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use AWS Database Migration Service (DMS) for continuous replication to a separate RDS instance in us-west-2.
Why it's wrong here
AWS Database Migration Service (DMS) is primarily designed for database migrations, consolidations, and analytical data synchronisation, not as a low RPO, high-availability disaster recovery solution for Amazon RDS. While it offers continuous replication, its architecture can introduce latency, making it unsuitable for the strict 1-hour RPO required to ensure minimal data loss in a DR scenario. DMS is tempting because it facilitates cross-region data movement, and it would be a correct choice for migrating an existing database to RDS or synchronising data for reporting purposes.
- ✓
Create a cross-region read replica in us-west-2 and promote it during failover.
Why this is correct
Cross-region read replicas provide low RPO and can be promoted quickly, meeting both RTO and RPO.
- ✗
Export data to S3 using AWS Backup and restore in us-west-2.
Why it's wrong here
Backup and restore may take longer than 4 hours and RPO depends on backup frequency.
- ✗
Take daily automated snapshots of the RDS instance and copy them to us-west-2.
Why it's wrong here
Daily snapshots provide an RPO of up to 24 hours, exceeding the 1-hour requirement.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.