The correct answer is to enable S3 Cross-Region Replication (CRR) with the appropriate KMS key and IAM role. This works because S3 CRR can replicate objects encrypted with SSE-KMS, but only when you explicitly specify the destination KMS key and grant the replication IAM role the necessary permissions, including `kms:Decrypt` on the source key and `kms:Encrypt` on the destination key. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding that CRR is the only automated, ongoing replication service for SSE-KMS objects, while common traps like S3 Batch Operations or the `aws s3 sync` CLI command are for one-time or manual actions, not continuous replication. Remember the memory tip: “CRR needs a key and a role to roll” — without both, encrypted objects simply won’t replicate.
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A data engineer is tasked with designing a disaster recovery solution for a data lake stored in Amazon S3. The data lake contains sensitive customer data that must be replicated to a different AWS Region. The engineer needs to ensure that all objects, including those with encryption using SSE-KMS, are replicated. Which solution meets the requirements?
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) with the appropriate KMS key and IAM role.
Option C is correct because S3 Cross-Region Replication can replicate objects with SSE-KMS if the KMS key is specified and the IAM role has necessary permissions. Option A is wrong because S3 Batch Operations is for one-time bulk actions. Option B is wrong because S3 Sync CLI command is not automatic for ongoing replication. Option D is wrong because S3 Transfer Acceleration speeds up uploads but does not replicate.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use S3 Batch Operations to copy objects to the destination bucket.
Why it's wrong here
Batch Operations is not a continuous replication solution.
✓
Enable S3 Cross-Region Replication (CRR) with the appropriate KMS key and IAM role.
Why this is correct
CRR supports SSE-KMS with proper configuration.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use S3 Transfer Acceleration to copy objects across regions.
Why it's wrong here
Transfer Acceleration does not replicate.
✗
Use the AWS CLI s3 sync command scheduled in a cron job.
Why it's wrong here
This is not automatic and may miss changes.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
Data Operations and Support — This question tests Data Operations and Support — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Enable S3 Cross-Region Replication (CRR) with the appropriate KMS key and IAM role. — Option C is correct because S3 Cross-Region Replication can replicate objects with SSE-KMS if the KMS key is specified and the IAM role has necessary permissions. Option A is wrong because S3 Batch Operations is for one-time bulk actions. Option B is wrong because S3 Sync CLI command is not automatic for ongoing replication. Option D is wrong because S3 Transfer Acceleration speeds up uploads but does not replicate.
What should I do if I get this DEA-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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