SAP-C02 Question #501: Real Exam Question with Answer & Explanation

Question

A company wants to use AWS for disaster recovery for an on-premises application. The company has hundreds of Windows-based servers that run the application. All the servers mount a common share. The company has an RTO of 15 minutes and an RPO of 5 minutes. The solution must support native failover and fallback capabilities. Which solution will meet these requirements MOST cost-effectively?

Options

• ACreate an AWS Storage Gateway File Gateway. Schedule daily Windows server backups. Save
• BCreate a set of AWS CloudFormation templates to create infrastructure. Replicate all data to
• CCreate an AWS Cloud Development Kit (AWS CDK) pipeline to stand up a multi-site active-active
• DUse AWS Elastic Disaster Recovery to replicate the on-premises servers. Replicate data to an

Explanation

To cost-effectively implement disaster recovery for on-premises Windows servers with a common share, meeting aggressive RTO/RPO requirements, use AWS Elastic Disaster Recovery for continuous server replication and Amazon FSx for Windows File Server for the shared storage.

Common mistakes.

• A. Daily backups to S3 via Storage Gateway will not meet the aggressive RPO of 5 minutes or RTO of 15 minutes, as recovery from daily backups is typically a much slower process.
• B. Using CloudFormation for infrastructure combined with manual S3 data replication is insufficient to meet low RPO/RTO requirements for entire server workloads, as S3 is object storage and this method lacks continuous block-level replication.
• C. Implementing a multi-site active-active environment is a highly available but generally the most expensive disaster recovery strategy, which conflicts with the 'MOST cost-effectively' requirement for this DR scenario.

Concept tested. Disaster recovery (DR), RTO/RPO, on-premises to cloud migration, managed file services

Reference. https://aws.amazon.com/elastic-disaster-recovery/

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