This DEA-C01 practice question tests your understanding of data ingestion and transformation. 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 needs to ingest data from an on-premises Oracle database into Amazon S3 using AWS DMS. The change data capture (CDC) must be enabled to capture ongoing changes. Which additional AWS service is required to store the transaction logs for CDC?
Amazon RDS
Why wrong: Not used for storing CDC logs; DMS uses S3.
Amazon S3
DMS CDC uses S3 to store Oracle transaction logs for ongoing replication.
Amazon EBS
Why wrong: Block storage for EC2, not used by DMS.
Amazon CloudWatch Logs
Why wrong: Used for monitoring and logging, not for storing transaction logs.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon S3
Option A is correct because AWS DMS CDC requires Oracle transaction logs to be stored in S3 or a custom S3 bucket for replication. Option B (CloudWatch Logs) is for monitoring, not storage. Option C (Amazon RDS) is a database, not storage. Option D (Amazon EBS) is block storage attached to EC2, not suitable for DMS CDC.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Amazon RDS
Why it's wrong here
Not used for storing CDC logs; DMS uses S3.
Amazon S3
Why this is correct
DMS CDC uses S3 to store Oracle transaction logs for ongoing replication.
Related concept
Standard ACLs match source addresses.
Amazon EBS
Why it's wrong here
Block storage for EC2, not used by DMS.
Amazon CloudWatch Logs
Why it's wrong here
Used for monitoring and logging, not for storing transaction logs.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
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
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
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FAQ
Data Ingestion and Transformation — This question tests Data Ingestion and Transformation — Standard ACLs match source addresses..
The correct answer is: Amazon S3 — Option A is correct because AWS DMS CDC requires Oracle transaction logs to be stored in S3 or a custom S3 bucket for replication. Option B (CloudWatch Logs) is for monitoring, not storage. Option C (Amazon RDS) is a database, not storage. Option D (Amazon EBS) is block storage attached to EC2, not suitable for DMS CDC.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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.
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