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Disaster Recovery in AWS: A Question Walkthrough for SAA-C03
Understanding disaster recovery options in AWS is crucial for the SAA-C03 exam. This post analyzes a specific exam question to boost your preparation.
Disaster recovery decisions can trip up candidates on the SAA-C03 exam. Candidates often struggle to match specific AWS services to the nuanced needs of RTO and RPO requirements. A clear understanding of these concepts and the services available is essential.
The question
A company wants to implement a disaster recovery solution for their critical application hosted on AWS. They are considering using a combination of AWS services to achieve a recovery time objective (RTO) of less than one hour and a recovery point objective (RPO) of less than five minutes. Which combination of services should they choose?
A. AWS Backup and Amazon S3
B. Amazon RDS with Read Replicas and Amazon Route 53
C. AWS Elastic Beanstalk and Amazon CloudFront
D. Amazon S3 Cross-Region Replication and AWS DataSync
Think before you scroll
Before selecting an answer, consider the specific needs for RTO and RPO. These metrics are critical in determining the right AWS services to ensure quick recovery and minimal data loss. Each option should be evaluated against these criteria.
The answer
The correct option is B. Amazon RDS with Read Replicas and Amazon Route 53. This combination allows for quick recovery with low RPO due to the near real-time data replication of RDS, while Route 53 can facilitate rapid DNS failover, meeting the required RTO.
Why the other options lose
- A. AWS Backup and Amazon S3: While AWS Backup is effective for backups, it does not provide the low RTO and RPO needed for active applications. S3 is primarily a storage solution and lacks built-in disaster recovery features.
- C. AWS Elastic Beanstalk and Amazon CloudFront: Elastic Beanstalk is focused on application deployment and management, not specifically on disaster recovery. CloudFront is a content delivery network and does not address RTO or RPO requirements.
- D. Amazon S3 Cross-Region Replication and AWS DataSync: S3 Cross-Region Replication is useful for data redundancy but does not focus on application-level recovery. DataSync is for transferring large amounts of data, not for meeting RTO or RPO requirements.
The concept behind it
Understanding the concepts of RTO and RPO is crucial for disaster recovery planning in AWS. RTO measures how quickly you need to recover, while RPO defines how much data loss is acceptable. Services like Amazon RDS with Read Replicas provide low RPO due to continuous data replication, which is essential for critical applications.
Exam trap to remember
Always match RTO and RPO requirements to the capabilities of the chosen AWS services. Quick recovery options often involve services designed for active data management, not just storage.