- A
S3 Standard
Why wrong: Higher cost for infrequent access.
- B
S3 One Zone-IA
Why wrong: Lower durability and higher PUT cost.
- C
S3 Glacier Deep Archive
Why wrong: Retrieval times too slow.
- D
S3 Intelligent-Tiering
Auto-tiering optimizes cost.
Question 1,150 of 1,616
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. 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 developer is optimizing costs for an S3 bucket that stores infrequently accessed data but requires millisecond retrieval. The bucket receives 100 PUT requests per second and 10 GET requests per second. Which storage class is most cost-effective?
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
✓
S3 Intelligent-Tiering
S3 Intelligent-Tiering is the most cost-effective choice because it automatically moves objects between access tiers based on changing access patterns, optimizing costs without performance impact. The workload has a high write-to-read ratio (100 PUTs vs 10 GETs per second) and requires millisecond retrieval, which Intelligent-Tiering supports while avoiding the retrieval fees and minimum storage duration penalties of One Zone-IA or Glacier Deep Archive.
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 Standard
Why it's wrong here
Higher cost for infrequent access.
- ✗
S3 One Zone-IA
Why it's wrong here
Lower durability and higher PUT cost.
- ✗
S3 Glacier Deep Archive
Why it's wrong here
Retrieval times too slow.
- ✓
S3 Intelligent-Tiering
Why this is correct
Auto-tiering optimizes cost.
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 choose S3 One Zone-IA for infrequently accessed data, overlooking the high PUT rate and millisecond retrieval requirement, which make Intelligent-Tiering more cost-effective due to its automatic tiering and lack of retrieval fees.
Detailed technical explanation
How to think about this question
S3 Intelligent-Tiering monitors access patterns at the object level and moves data between four access tiers: Frequent Access, Infrequent Access, Archive Instant Access, and Deep Archive Access, with no retrieval fees and a small monthly monitoring fee per object. The high PUT rate (100/s) means objects are initially placed in the Frequent Access tier, and if they remain unaccessed for 30 days, they automatically move to Infrequent Access, reducing storage costs without manual lifecycle policies. This is ideal for unpredictable or changing access patterns, as it avoids the fixed costs and penalties of other storage classes.
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 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.
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 |
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: S3 Intelligent-Tiering — S3 Intelligent-Tiering is the most cost-effective choice because it automatically moves objects between access tiers based on changing access patterns, optimizing costs without performance impact. The workload has a high write-to-read ratio (100 PUTs vs 10 GETs per second) and requires millisecond retrieval, which Intelligent-Tiering supports while avoiding the retrieval fees and minimum storage duration penalties of One Zone-IA or Glacier Deep Archive.
What should I do if I get this DVA-C02 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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Last reviewed: Jun 24, 2026
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