The answer is to enable CloudFront Origin Shield, which creates a central caching layer to reduce data transfer costs and improve performance. Origin Shield works by aggregating requests from multiple edge locations into a single point before they reach the origin, dramatically increasing the cache hit ratio and minimizing the number of requests that travel to the origin server. This directly lowers data transfer costs because fewer origin fetches are needed, and it reduces latency for users by serving more content from cache. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this question tests your understanding of cost optimization features within CloudFront; a common trap is confusing Origin Shield with Lambda@Edge or origin failover, which address different concerns like processing or availability. Remember the key distinction: Origin Shield is specifically designed to centralize caching for cost reduction, not for compute or redundancy. A helpful memory tip is to think of Origin Shield as a “cache umbrella” that shields your origin from redundant requests.
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 CloudFront to distribute content globally. They want to reduce data transfer costs and improve performance for users. What feature should they enable?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable Origin Shield to create a central caching layer.
Option B is correct because Origin Shield increases cache hit ratio by centralizing requests, reducing origin load and data transfer cost. Option A is wrong because Lambda@Edge adds processing but does not directly reduce transfer. Option C is wrong because it increases cache hits but does not reduce origin requests as effectively as Origin Shield. Option D is wrong because origin failover is for availability, not cost.
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.
✗
Configure multiple origins with failover.
Why it's wrong here
Origin failover improves availability, not cost.
✗
Enable Lambda@Edge to modify requests and responses.
Why it's wrong here
Lambda@Edge adds compute cost and does not directly reduce data transfer.
✓
Enable Origin Shield to create a central caching layer.
Why this is correct
Origin Shield increases cache hit ratio, reducing origin requests and transfer costs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the TTL for cache behaviors to the maximum allowed value.
Why it's wrong here
Longer TTLs increase cache hits but may serve stale content; does not reduce origin requests as efficiently as Origin Shield.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Enable Origin Shield to create a central caching layer. — Option B is correct because Origin Shield increases cache hit ratio by centralizing requests, reducing origin load and data transfer cost. Option A is wrong because Lambda@Edge adds processing but does not directly reduce transfer. Option C is wrong because it increases cache hits but does not reduce origin requests as effectively as Origin Shield. Option D is wrong because origin failover is for availability, not cost.
What should I do if I get this SOA-C02 question wrong?
Identify which SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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