DEA-C01 Data Store Management Practice Question
A company is using Amazon S3 as a data lake. The data engineer needs to ensure that all objects uploaded to a specific bucket are automatically replicated to a bucket in another AWS Region for disaster recovery. Which configuration should the engineer implement?
⚠ Common exam trap
It's easy for candidates to confuse S3 Transfer Acceleration (which speeds up uploads) with replication, or assume S3 Batch Operations can be used for ongoing replication, when only CRR provides automatic, cross-region object replication for disaster recovery.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable S3 Cross-Region Replication (CRR) on the source bucket.
S3 Cross-Region Replication (CRR) is the correct choice because it automatically replicates objects from a source bucket in one AWS Region to a destination bucket in a different AWS Region, meeting the disaster recovery requirement for geographic separation. CRR requires versioning to be enabled on both buckets and replicates new objects asynchronously after upload.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable S3 Same-Region Replication (SRR) on the source bucket.
Why it's wrong here
Same-Region Replication keeps both source and destination in one AWS Region, so it cannot satisfy the cross-Region disaster-recovery requirement. SRR is tempting when replicating between buckets in the same Region, but here the destination bucket sits in another Region, requiring CRR.
- ✓
Enable S3 Cross-Region Replication (CRR) on the source bucket.
Why this is correct
S3 Cross-Region Replication automatically copies objects to a bucket in a different AWS Region, satisfying the disaster recovery requirement. Configuring CRR on the source bucket replicates new uploads asynchronously, providing cross-Region durability without application changes. Versioning must be enabled on both source and destination buckets for replication to function.
- ✗
Use S3 Transfer Acceleration to copy objects to the destination.
Why it's wrong here
Transfer Acceleration only speeds up uploads to a bucket via edge locations; it does not copy objects to another bucket or Region. It is tempting as a performance tool, but replication to a second Region requires S3 Cross-Region Replication, not acceleration.
- ✗
Use S3 Batch Operations to copy existing objects.
Why it's wrong here
S3 Batch Operations performs one-off bulk copies of existing objects; it does not replicate new uploads automatically. It is tempting for migrating a backlog, but the requirement is continuous cross-Region replication of every new object, which needs S3 Cross-Region Replication.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.