AWS Certified Solutions Architect – Professional — Question 143

A retail company is running an application that stores invoice files in an Amazon S3 bucket and metadata about the files in an Amazon DynamoDB table. The application software runs in both us-east-1 and eu-west-1. The S3 bucket and DynamoDB table are in us-east-1. The company wants to protect itself from data corruption and loss of connectivity to either Region.
Which option meets these requirements?

Answer options

• A. Create a DynamoDB global table to replicate data between us-east-1 and eu-west-1. Enable continuous backup on the DynamoDB table in us-east-1. Enable versioning on the S3 bucket.
• B. Create an AWS Lambda function triggered by Amazon CloudWatch Events to make regular backups of the DynamoDB table. Set up S3 cross-region replication from us-east-1 to eu-west-1. Set up MFA delete on the S3 bucket in us-east-1.
• C. Create a DynamoDB global table to replicate data between us-east-1 and eu-west-1. Enable versioning on the S3 bucket. Implement strict ACLs on the S3 bucket.
• D. Create a DynamoDB global table to replicate data between us-east-1 and eu-west-1. Enable continuous backup on the DynamoDB table in us-east-1. Set up S3 cross-region replication from us-east-1 to eu-west-1.

Correct answer: D

Explanation

Option D is the best choice as it provides both global replication for the DynamoDB table and cross-region replication for the S3 bucket, ensuring data availability and protection against loss. Option A lacks cross-region replication for S3, which is essential for redundancy. Option B does not include the necessary global table for DynamoDB and relies on manual backups, which may not be as effective. Option C fails to address the need for S3 cross-region replication, leaving the data vulnerable in the event of a regional outage.