CV0-004 Cloud Architecture and Design Practice Question
A cloud architect is designing a system that must durably store an unlimited amount of unstructured data, such as images and videos, with 99.999999999% (11 nines) durability. The data will be accessed infrequently, but when accessed, it must be available within milliseconds. The architect wants the most cost-effective storage class for this access pattern. Which Amazon S3 storage class should the architect choose?
⚠ Common exam trap
The trap here is assuming that S3 Intelligent-Tiering is always the most cost-effective for infrequent access, when in fact it adds a per-object monitoring fee that can make it more expensive than a static infrequent access class for known access patterns.
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
✓
Amazon S3 Standard-Infrequent Access (S3 Standard-IA)
Amazon S3 Standard-IA is the correct choice because it provides low-latency access and 11 nines of durability at a lower storage cost than S3 Standard, making it ideal for infrequently accessed data that requires immediate availability. The other options are either too expensive for infrequent access, incur monitoring fees, or have retrieval times that are too slow.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Amazon S3 Glacier Deep Archive
Why it's wrong here
Amazon S3 Glacier Deep Archive is the lowest-cost storage class for long-term retention, but retrieval can take up to 12 hours, which does not meet the requirement for millisecond access. It is designed for data that is rarely accessed and can tolerate long retrieval times. Therefore, it is not suitable for data that must be available within milliseconds.
- ✗
Amazon S3 Standard
Why it's wrong here
Amazon S3 Standard provides low-latency and high-throughput performance for frequently accessed data, and it offers 11 nines of durability. However, it is not the most cost-effective choice for infrequently accessed data because it does not have a lower storage price for infrequent access. Using S3 Standard would result in higher storage costs compared to a class designed for infrequent access.
- ✗
Amazon S3 Intelligent-Tiering
Why it's wrong here
Amazon S3 Intelligent-Tiering automatically moves data between access tiers based on changing access patterns, which can optimize costs. However, it charges a small monthly monitoring and automation fee per object. For data that is known to be infrequently accessed, a static infrequent access class is more cost-effective because it avoids the monitoring fee and provides lower storage costs from the outset.
- ✓
Amazon S3 Standard-Infrequent Access (S3 Standard-IA)
Why this is correct
Amazon S3 Standard-IA is designed for data that is accessed less frequently but requires rapid access when needed. It offers the same low latency and high throughput as S3 Standard, with 11 nines of durability, and has a lower storage price. It is the most cost-effective choice for infrequently accessed data that must be immediately available, though it has a minimum storage duration charge of 30 days.
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 |
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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