Quick Answer
The answer is S3 Intelligent-Tiering. This storage class is the most cost-effective for unpredictable access because it automatically monitors and moves objects between frequent and infrequent access tiers based on shifting usage patterns, eliminating the need to manually guess the right tier for data that is accessed frequently for the first hour and then rarely afterward. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of S3 storage class cost optimization for unpredictable access, often appearing as a trick where candidates gravitate toward S3 Standard or One Zone-IA, forgetting that Intelligent-Tiering’s automation handles the transition from hot to cold access without minimum storage duration penalties. A common trap is choosing Glacier Deep Archive, but its 180-day minimum makes it unsuitable for temporary 24-hour files. Memory tip: Think “Intelligent” for unpredictable—if access patterns are a moving target, let the service do the guessing.
This SOA-C02 practice question tests your understanding of cost and performance optimization. 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.
An application running on Amazon EC2 generates a large number of small files that are stored temporarily and deleted after 24 hours. The files are accessed frequently within the first hour and then rarely. Which Amazon S3 storage class is MOST cost-effective for this use case?
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 Glacier Deep Archive
Why wrong: Minimum 180-day storage duration; data deleted earlier incurs costs.
S3 Intelligent-Tiering
Automatically moves data between tiers based on access.
S3 One Zone-Infrequent Access
Why wrong: Less durable and not optimized for frequent initial access.
S3 Standard
Why wrong: Standard is expensive for data that becomes rarely accessed.
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 Intelligent-Tiering
S3 Intelligent-Tiering automatically moves objects between tiers based on access patterns, making it cost-effective for unpredictable access. Option A is wrong because S3 Standard is more expensive for rarely accessed data. Option B is wrong because S3 One Zone-IA may have lower durability but not necessarily lower cost for this pattern. Option D is wrong because S3 Glacier Deep Archive has a minimum storage duration of 180 days.
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 Glacier Deep Archive
Why it's wrong here
Minimum 180-day storage duration; data deleted earlier incurs costs.
S3 Intelligent-Tiering
Why this is correct
Automatically moves data between tiers based on access.
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 One Zone-Infrequent Access
Why it's wrong here
Less durable and not optimized for frequent initial access.
S3 Standard
Why it's wrong here
Standard is expensive for data that becomes rarely accessed.
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 SOA-C02 NAT questions on configuration and troubleshooting.
Cost and Performance Optimization — study guide chapter
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Cost and Performance Optimization practice questions
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FAQ
Cost and Performance Optimization — This question tests Cost and Performance Optimization — Static NAT maps one inside address to one outside address..
The correct answer is: S3 Intelligent-Tiering — S3 Intelligent-Tiering automatically moves objects between tiers based on access patterns, making it cost-effective for unpredictable access. Option A is wrong because S3 Standard is more expensive for rarely accessed data. Option B is wrong because S3 One Zone-IA may have lower durability but not necessarily lower cost for this pattern. Option D is wrong because S3 Glacier Deep Archive has a minimum storage duration of 180 days.
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 SOA-C02 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 SOA-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 SOA-C02 exam.
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