The correct solution is to set up Amazon CloudFront as a content delivery network in front of the S3 bucket. CloudFront reduces latency for a globally distributed audience by caching static website content at edge locations closer to users, while simultaneously lowering data transfer costs because most requests are served from the cache rather than the S3 origin, minimizing S3 egress charges. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of how CloudFront acts as a cost-optimization and performance accelerator for S3 static websites—a common trap is choosing S3 Transfer Acceleration, which only speeds up uploads, not global read latency. Remember the memory tip: “Edge cache slashes both lag and egress cash.”
SOA-C02 Cost and Performance Optimization Practice Question
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.
A company uses Amazon S3 for static website hosting. The website serves thousands of users globally, and the company wants to reduce latency and lower data transfer costs. Which solution should the SysOps administrator implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set up Amazon CloudFront as a content delivery network (CDN) in front of the S3 bucket.
Amazon CloudFront is a global content delivery network (CDN) that caches static content at edge locations closer to users, reducing latency and lowering data transfer costs by minimizing direct requests to the S3 origin. By serving cached objects from edge locations, CloudFront also reduces the amount of data transferred from S3, which can significantly decrease S3 data transfer egress charges.
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.
✓
Set up Amazon CloudFront as a content delivery network (CDN) in front of the S3 bucket.
Why this is correct
CloudFront caches content at edge locations, reducing latency and data transfer costs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use S3 Intelligent-Tiering storage class.
Why it's wrong here
Intelligent-Tiering optimizes storage costs, not network performance.
✗
Enable cross-region replication and serve from multiple buckets.
Why it's wrong here
Replication incurs costs and does not reduce latency for global users.
✗
Enable S3 Transfer Acceleration on the bucket.
Why it's wrong here
Transfer Acceleration speeds up uploads to S3, not downloads to users.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse S3 Transfer Acceleration (which speeds up uploads) with a CDN solution for download performance, or they think cross-region replication alone solves latency without considering the need for a global caching layer.
Detailed technical explanation
How to think about this question
CloudFront integrates with S3 via origin access control (OAC) to keep the bucket private and enforce secure access. When a user requests an object, CloudFront checks its edge cache first; if the object is not cached, it fetches it from the S3 origin and caches it at the edge for subsequent requests, reducing origin load and improving response times. In a real-world scenario, a global user base accessing a single S3 bucket in us-east-1 would experience high latency from distant regions, but CloudFront edge locations in over 90 cities worldwide can serve cached content with sub-50ms latency.
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.
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.
Cost and Performance Optimization — This question tests Cost and Performance Optimization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set up Amazon CloudFront as a content delivery network (CDN) in front of the S3 bucket. — Amazon CloudFront is a global content delivery network (CDN) that caches static content at edge locations closer to users, reducing latency and lowering data transfer costs by minimizing direct requests to the S3 origin. By serving cached objects from edge locations, CloudFront also reduces the amount of data transferred from S3, which can significantly decrease S3 data transfer egress charges.
What should I do if I get this SOA-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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is using Amazon S3 to host a static website. The website receives millions of requests per month from users around the world. The company wants to reduce latency and S3 data transfer costs. Which solution should the company implement?
easy
A.Enable S3 replication to multiple regions.
✓ B.Use Amazon CloudFront as a content delivery network in front of the S3 bucket.
C.Enable S3 Transfer Acceleration.
D.Use S3 Cross-Region Replication to replicate objects to all regions.
Why B: Amazon CloudFront is a content delivery network that caches content at edge locations, reducing latency and data transfer costs from S3. S3 Transfer Acceleration speeds up uploads but not downloads. S3 Replication does not reduce latency. S3 Cross-Region Replication is for data redundancy, not performance.
Variation 2. A company hosts a static website on Amazon S3 with public read access. The website content is updated weekly. The SysOps administrator notices that the monthly S3 costs are higher than expected. The website receives about 10,000 requests per day, and each object is small (average 50 KB). The administrator wants to reduce costs without affecting the user experience. The website does not require HTTPS or custom domain at this time. Which action should the administrator take?
easy
A.Enable default encryption for the S3 bucket.
B.Transition the objects to S3 Glacier Flexible Retrieval.
✓ C.Place an Amazon CloudFront distribution in front of the S3 bucket.
D.Enable S3 Versioning to prevent accidental deletions.
Why C: Option A is correct because placing a CloudFront distribution in front of the S3 bucket can reduce costs by serving requests from edge caches, which reduces the number of GET requests to S3. Additionally, CloudFront offers a free tier for data transfer. Option B is wrong because enabling versioning increases storage costs. Option C is wrong because transitioning to S3 Glacier Standard (which doesn't exist; Glacier Flexible Retrieval) would increase retrieval costs and latency, and is not suitable for a website. Option D is wrong because encryption adds overhead but does not reduce costs.
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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.
Question Discussion
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