AWS Certified Solutions Architect – Professional — Question 724

A company needs to deploy its document storage application across two AWS Regions. The company is storing PDF documents that have an average file size of 512 KiB and a minimum file size of 200 KiB. The company needs protection for accidental document overwrites in the primary Region. The secondary Region must have cost-optimized storage. The company needs a solution that provides an SLA of 99.99% that files will be replicated to the secondary Region within 15 minutes.

Which solution will meet these requirements?

Answer options

• A. Deploy an Amazon FSx cluster for multiple application hosts to mount in the primary Region. Configure a second Amazon FSx deployment in the secondary Region. Configure replication from the Amazon FSx cluster in the primary Region to the Amazon FSx deployment in the secondary Region.
• B. Deploy two Amazon S3 buckets, one in each Region. Enable S3 Versioning for each bucket. Enable S3 Replication Time Control (S3 RTC) to replicate objects to the secondary Region. Specify S3 Glacier Deep Archive as the storage class in the secondary Region.
• C. Deploy two Amazon S3 buckets, one in each Region. Enable S3 Versioning for the bucket in the primary Region. Set up S3 Cross-Region Replication (CRR) from the primary Region to the secondary Region. Create an S3 event secondary bucket to invoke an AWS Lambda function that reviews each replicated object and specifies S3 Glacier Deep Archive as the storage class in the secondary Region.
• D. Deploy an Amazon FSx multi-Region cluster. Configure the multi-Region cluster with object versioning. Mount the file system as ZFS with versioning support. Activate S3 archiving from Amazon FSx.

Correct answer: B

Explanation

Amazon S3 Replication Time Control (S3 RTC) is specifically designed to replicate objects within 15 minutes with a 99.99% SLA, which perfectly matches the replication requirements. Enabling S3 Versioning protects against accidental overwrites, while replicating directly to S3 Glacier Deep Archive provides the most cost-optimized storage in the secondary region. Other solutions, like standard S3 Cross-Region Replication (CRR) without S3 RTC or Amazon FSx replication, do not offer the required 15-minute SLA guarantee.