The answer is S3 Standard-IA and S3 One Zone-IA, along with S3 Intelligent-Tiering when configured to auto-archive infrequently accessed objects. These three storage classes are designed for infrequently accessed data with millisecond retrieval because they all provide the same low-latency, high-throughput performance as S3 Standard, but at a lower storage cost. The key technical distinction is that S3 Standard-IA stores data across multiple Availability Zones for resilience, while S3 One Zone-IA stores it in a single AZ, sacrificing durability for even lower cost. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your ability to differentiate between cost-optimized storage tiers that still meet sub-millisecond access requirements—a common trap is confusing S3 Glacier Instant Retrieval, which also offers millisecond access but is designed for long-term archival, not general infrequently accessed data. Remember the memory tip: if it needs instant access but is rarely touched, think “IA” for Infrequent Access, and if you can tolerate a single AZ risk, add “One Zone.”
DEA-C01 Data Store Management Practice Question
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.
Which THREE storage classes in Amazon S3 are designed for infrequently accessed data with millisecond retrieval times? (Select THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
S3 One Zone-IA
S3 One Zone-IA is designed for infrequently accessed data that requires millisecond retrieval times, but does not require the resilience of multiple Availability Zones. It stores data in a single AZ and offers the same low-latency performance as S3 Standard, making it suitable for non-critical, infrequently accessed data.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
S3 Glacier Flexible Retrieval
Why it's wrong here
Glacier Flexible Retrieval has retrieval times of minutes to hours.
✓
S3 One Zone-IA
Why this is correct
One Zone-IA also provides millisecond retrieval for infrequently accessed data.
Related concept
Read the scenario before looking for a memorised answer.
✗
S3 Glacier Deep Archive
Why it's wrong here
Deep Archive has retrieval times of 12 hours or more.
✓
S3 Intelligent-Tiering
Why this is correct
Intelligent-Tiering automatically moves data between access tiers, including IA, with millisecond retrieval.
Related concept
Read the scenario before looking for a memorised answer.
✓
S3 Standard-IA
Why this is correct
Standard-IA is for infrequently accessed data with millisecond retrieval.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse S3 Glacier Flexible Retrieval or S3 Glacier Deep Archive as having millisecond retrieval times, but these classes are designed for archival access with retrieval times measured in minutes or hours, not milliseconds.
Detailed technical explanation
How to think about this question
S3 One Zone-IA, S3 Standard-IA, and S3 Intelligent-Tiering all provide millisecond retrieval times by storing data on high-performance storage with immediate access. S3 Intelligent-Tiering automatically moves objects between access tiers (frequent, infrequent, and archive instant) based on changing access patterns, while still maintaining millisecond latency for the infrequent access tier. S3 Standard-IA and One Zone-IA use a fixed pricing model with a per-GB retrieval fee, making them cost-effective for data accessed less than once per month but requiring instant access.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: S3 One Zone-IA — S3 One Zone-IA is designed for infrequently accessed data that requires millisecond retrieval times, but does not require the resilience of multiple Availability Zones. It stores data in a single AZ and offers the same low-latency performance as S3 Standard, making it suitable for non-critical, infrequently accessed data.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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.
Question Discussion
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