Use two-way S3 bucket replication and convert the DynamoDB tables to global tables
Short answer
A Use two-way S3 bucket replication and convert the DynamoDB tables into global tables with the secondary Region added.
Question
Key Takeaways
The requirement is immediate propagation, which rules out any batch mechanism: S3 Batch Operations copy jobs are bulk operations intended for existing objects and historical backfill, not continuous replication, so B and D are excluded on the immediacy requirement (A). DynamoDB global tables are the managed feature for multi-Region replication with in-Region reads and writes, whereas the DynamoDB streams plus Lambda copy pattern in C and D requires deploying and operating custom replication code in each Region and does not give the same consistency guarantees (A).
Both data stores must persist in both Regions and must propagate immediately. For S3, two-way bucket replication keeps both Regions continuously synchronized so writes in either Region reach the other. For DynamoDB, converting the tables to global tables replicates the items across the configured Regions and supports in-Region read and write, which satisfies immediate propagation with no custom code. Together these are the two purpose-built replication features and require no application changes.
Common mistake: Using S3 Batch Operations copy jobs between Regions (B and D) — trungtd identified this directly, noting that batch copy jobs are not immediate and are intended for bulk copying rather than continuous propagation, so they cannot satisfy the immediate-propagation requirement. Enabling DynamoDB streams and deploying Lambda functions in each Region to copy records to the other Region (C and D) — this reinvents managed replication with custom code that must be deployed, monitored, and kept consistent, whereas global tables provide replication as a table configuration. Note that jamesf observed two-way S3 replication is more than many scenarios need, but it is required here because both Regions must serve reads of the same data.
Expert Analysis
Why the Answer Is Correct
The requirement is that data persists in both Regions and propagates immediately, which calls for the purpose-built replication feature in each service rather than any batch or custom-code approach. For object storage, implementing two-way S3 bucket replication between the primary and secondary Regions keeps both buckets continuously synchronized, so an object written in either Region appears in the other (A). For the database, converting the DynamoDB tables into global tables with the secondary Region set as the additional Region propagates items across Regions and supports in-Region reads and writes, which is managed, immediate, and requires no changes to the application (A). Both are native features with no operational overhead, which satisfies the most-operational-efficiency requirement. A is the correct answer.
Why the Other Options Are Wrong
B implements S3 Batch Operations copy jobs between the primary and secondary Regions and converts the DynamoDB tables to global tables. The DynamoDB half is correct, but trungtd identified that S3 Batch Operations copy jobs are not immediate and are typically used for the bulk copying of existing data, so they do not provide the continuous propagation the requirement demands; new objects written after the job would not appear in the secondary Region. D combines the same batch copy jobs with a custom replication pattern, adding the batch limitation and the custom code on top. C implements two-way S3 replication, which is correct, but replaces global tables with DynamoDB streams plus an AWS Lambda function in each Region subscribed to the stream that copies new records to the other Region's tables. trungdd noted this reinvents managed replication; it requires deploying and operating functions in both Regions, and it does not provide the managed, in-Region consistency that global tables provide. A is correct.
Community Comment Notes
Community voted A unanimously. jamesf addressed the two-way replication directly, noting that while two-way replication is not needed in most scenarios since one-way is generally sufficient, this requirement calls for both Regions to have the data, which makes it necessary. trungtd gave the decisive rejections, that S3 Batch Operations copy jobs are not immediate and are intended for bulk copying so B and D fail the immediacy requirement, and that the DynamoDB streams approach in C replaces managed replication. tgv confirmed A. No alternative received support.
Official Reference
- https://docs.aws.amazon.com/AmazonS3/latest/userguide/replication.html
- https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/global-tables.html
These links open the official vendor documentation in a new tab.
Community Votes
100% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 3 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 3
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jamesf 👍 5 Answered ATwo-Way S3 Bucket Replication: - While two-way replication is not typically needed for most scenarios (one-way replication is generally sufficient), for this requirement, if both regions need to have copies of data and keep them synchronized, you would implement replication rules to ensure data consistency across S3 buckets in different regions. Global DynamoDB Tables: - DynamoDB global tables are designed specifically for multi-Region, fully replicated tables. When you convert your DynamoDB tables into global tables and add the secondary Region, DynamoDB handles the replication of data across Regions automatically and immediately. This provides efficient and consistent data replication without requiring custom solutions.
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trungtd 👍 5 Answered AB & D. S3 Batch Operations copy jobs are not immediate and are typically used for bulk copying of data. They do not provide the immediacy required for data propagation across regions. C. DynamoDB streams with AWS Lambda functions to replicate data introduces additional complexity and operational overhead.
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tgv 👍 2---> A
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