CLF-C02 Cloud Technology and Services Practice Question
Which Amazon S3 storage class is most cost-effective for data that is accessed frequently?
⚠ Common exam trap
Many exam-takers confuse 'cost-effective' with 'lowest storage price per GB' and overlook retrieval fees and minimum storage duration charges, leading them to choose S3 Standard-IA or Glacier Instant Retrieval instead of S3 Standard for frequently accessed data.
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 Standard
S3 Standard is the most cost-effective storage class for frequently accessed data because it offers low latency and high throughput with no retrieval costs or minimum storage duration charges. For data accessed often, the per-GB storage cost of S3 Standard is lower than the combined storage plus retrieval costs of infrequent access classes like S3 Standard-IA or One Zone-IA.
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-IA
Why it's wrong here
S3 Standard-IA lowers the per-GB storage price but compensates with a per-GB data retrieval fee and a 30-day minimum storage duration. For workloads with frequent reads, these retrieval charges accumulate quickly and make the total cost exceed S3 Standard, despite what the lower storage rate suggests.
- ✗
S3 Glacier Instant Retrieval
Why it's wrong here
S3 Glacier Instant Retrieval is built for long-lived archive data that is accessed rarely, typically no more than once a quarter. Although it provides millisecond retrieval and a low storage price, it charges a significant per-GB retrieval fee and imposes a 90-day minimum storage duration, so frequent access quickly makes it far more expensive than S3 Standard.
- ✓
S3 Standard
Why this is correct
S3 Standard charges no data retrieval fee and has no minimum storage duration, so repeatedly reading the same objects incurs no per-GB penalty. It also stores objects redundantly across at least three Availability Zones, providing 99.99% availability and 99.999999999% durability, making it the most cost-effective and resilient choice for frequently accessed data.
- ✗
S3 One Zone-IA
Why it's wrong here
S3 One Zone-IA stores data redundantly only within a single Availability Zone, so it loses the multi-AZ durability and availability that S3 Standard provides. It also charges a per-GB retrieval fee and has a 30-day minimum storage duration, meaning frequent access adds ongoing retrieval costs and the data is at greater risk if the AZ fails.
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 |
Go deeper
Related to this question
About these practice questions
This CLF-C02 question is part of Courseiva's 988-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CLF-C02 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 CLF-C02 exam.