AWS Certified Solutions Architect Associate SAA-C03 Practice Question
A company plans to enable Amazon S3 Cross-Region Replication (CRR) on a bucket in us-east-1 to copy objects to a bucket in us-west-2. How will enabling CRR most likely affect data-transfer costs for the workload?
It eliminates all inter-Region data-transfer charges between the two buckets.
It reduces data-transfer costs only if S3 Transfer Acceleration is enabled on both buckets.
It incurs inter-Region Data Transfer OUT charges and replication PUT request charges, so total costs can increase unless carefully optimized.
It always reduces data-transfer costs because the data is closer to users in the destination Region.
When you replicate S3 objects across AWS Regions, Amazon S3 charges for:
Inter-Region Data Transfer OUT from the source bucket (billed at the source Region's rate).
PUT requests at the destination bucket.
Storage in the destination bucket.
Therefore, CRR can increase overall costs unless most GET requests in the destination Region offset the added replication charges. Simply enabling CRR does not automatically lower data-transfer costs.
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