Quick Answer
The answer is S3 Lifecycle policies. This feature is designed to automatically transition storage classes based on age or other rules, making it the ideal solution for moving log data from a frequently accessed tier like S3 Standard to a lower-cost tier such as S3 Glacier Deep Archive after 30 days. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your understanding of cost-optimization automation versus monitoring or manual tools. A common trap is confusing Lifecycle policies with S3 Intelligent-Tiering, which monitors access patterns but incurs a per-object monitoring fee and is not a rule-based transition mechanism. Remember the key distinction: Lifecycle policies are proactive and rule-driven, while Intelligent-Tiering is reactive and pattern-driven. For exam day, keep this memory tip handy: “Lifecycle sets the schedule; Intelligent-Tiering watches the clock.”
This DEA-C01 practice question tests your understanding of data store management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company is storing large amounts of log data in Amazon S3. The data is accessed frequently for the first 30 days, then rarely after that. The company wants to automatically transition the data to a lower-cost storage class after 30 days. Which S3 feature should the data engineer use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
S3 Intelligent-Tiering
Why wrong: Automatically optimizes cost but may not be as cost-effective for predictable transitions.
S3 Lifecycle policies
Lifecycle policies can transition objects after a specified number of days.
S3 Cross-Region Replication
Why wrong: Replicates data, doesn't change storage class.
S3 Batch Operations
Why wrong: For bulk actions, not automatic scheduling.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
S3 Lifecycle policies
Option B is correct because S3 Lifecycle policies automatically transition objects between storage classes. Option A is wrong because S3 Intelligent-Tiering monitors access patterns but may have monitoring costs. Option C is wrong because S3 replication is for copying data, not transitioning storage classes. Option D is wrong because S3 Batch Operations is for bulk actions, not automatic transitions.
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
For each option: why learners choose it and why it is or isn't the right answer here.
S3 Intelligent-Tiering
Why it's wrong here
Automatically optimizes cost but may not be as cost-effective for predictable transitions.
S3 Lifecycle policies
Why this is correct
Lifecycle policies can transition objects after a specified number of days.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
S3 Cross-Region Replication
Why it's wrong here
Replicates data, doesn't change storage class.
S3 Batch Operations
Why it's wrong here
For bulk actions, not automatic scheduling.
Common exam traps
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
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.
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
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
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 Store Management — study guide chapter
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FAQ
Data Store Management — This question tests Data Store Management — Static NAT maps one inside address to one outside address..
The correct answer is: S3 Lifecycle policies — Option B is correct because S3 Lifecycle policies automatically transition objects between storage classes. Option A is wrong because S3 Intelligent-Tiering monitors access patterns but may have monitoring costs. Option C is wrong because S3 replication is for copying data, not transitioning storage classes. Option D is wrong because S3 Batch Operations is for bulk actions, not automatic transitions.
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.
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Static NAT maps one inside address to one outside address.
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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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