SAP-C02 Continuous Improvement for Existing Solutions Practice Question
A media company uses S3 for storing video files and CloudFront for distribution. They implemented a Lambda@Edge function to add copyright headers. After deployment, some users report that older videos still lack the headers. What is the most likely reason?
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
✓
The CloudFront behavior for older videos does not include the Lambda function association.
Lambda@Edge functions are associated with specific CloudFront behaviors. If the function is only associated with certain behaviors (e.g., based on path pattern or cache behavior), older videos served under a different behavior that does not include the Lambda function association will not have the copyright headers added. Option B correctly identifies this as the most likely reason. Option A is incorrect because the function could be triggered for viewer request events but still not apply to all videos if not associated with all behaviors. Option C is irrelevant because S3 bucket policies do not affect Lambda@Edge execution. Option D is incorrect because the function runs on every request regardless of cache hit/miss; caching does not prevent the function from executing.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The Lambda@Edge function is not triggered for viewer request events.
Why it's wrong here
If it were not triggered, no videos would get headers. The issue is partial.
- ✓
The CloudFront behavior for older videos does not include the Lambda function association.
Why this is correct
If the distribution has multiple behaviors (e.g., based on path pattern), the function may only be associated with the behavior for newer videos.
- ✗
The S3 bucket policy denies access to the Lambda function.
Why it's wrong here
Lambda@Edge runs at CloudFront, not S3; S3 bucket policy doesn't affect it.
- ✗
The videos are cached in CloudFront and the function runs only on cache misses.
Why it's wrong here
Lambda@Edge can run on every request, including cache hits, if configured for viewer request.
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 by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SAP-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 SAP-C02 exam.