← DOP-C02·Amazon Web Services

Question 252 of 1,750

SDLC Automation →mediumMultiple ChoiceObjective-mapped

Why CloudFront Cache Invalidation is Crucial After CodePipeline Deploys to S3

This DOP-C02 practice question tests your understanding of sdlc automation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 AWS CodePipeline to deploy a static website to an S3 bucket. The pipeline includes a source stage (S3), a build stage (CodeBuild) that minifies assets, and a deploy stage that copies files to the production S3 bucket. The deploy stage uses 's3 sync' command. After a recent deployment, some users report seeing old content. What is the MOST likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The website is served through Amazon CloudFront, and the CloudFront distribution cache was not invalidated after the deployment.
CloudFront caches content; without invalidation, users see stale files.
B
The S3 bucket policy blocks public read access, so users get a 403 error.
Why wrong: This would cause access errors, not old content.
C
The IAM role for CodeBuild does not have permissions to write to the S3 bucket.
Why wrong: If permissions were insufficient, the build would fail.
D
The deploy stage uses 's3 cp' instead of 's3 sync', so new files are not uploaded.
Why wrong: The question states 's3 sync' is used, so files should be uploaded.

Full breakdown with real-world context →

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 website is served through Amazon CloudFront, and the CloudFront distribution cache was not invalidated after the deployment.

The most likely cause is that the static website is served through Amazon CloudFront, and the CloudFront distribution cache was not invalidated after the deployment. Even though the S3 bucket contents are updated via 's3 sync', CloudFront caches objects at edge locations based on TTL settings. Without a cache invalidation request, users continue to receive the old cached content until the TTL expires or the cache is manually cleared.

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.

✓
The website is served through Amazon CloudFront, and the CloudFront distribution cache was not invalidated after the deployment.
Why this is correct
CloudFront caches content; without invalidation, users see stale files.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The S3 bucket policy blocks public read access, so users get a 403 error.
Why it's wrong here
This would cause access errors, not old content.
✗
The IAM role for CodeBuild does not have permissions to write to the S3 bucket.
Why it's wrong here
If permissions were insufficient, the build would fail.
✗
The deploy stage uses 's3 cp' instead of 's3 sync', so new files are not uploaded.
Why it's wrong here
The question states 's3 sync' is used, so files should be uploaded.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may focus on S3 permissions or the sync command, overlooking the common real-world scenario where a CDN like CloudFront caches content and requires explicit invalidation after updates.

Detailed technical explanation

How to think about this question

CloudFront caches objects at edge locations based on the Cache-Control or Expires headers set on the origin objects. When using S3 as an origin, updating the S3 objects does not automatically purge CloudFront's cache. A cache invalidation request (e.g., via AWS CLI `aws cloudfront create-invalidation`) must be explicitly triggered in the pipeline to force CloudFront to fetch the new content. Alternatively, using versioned object keys (e.g., app-v2.js) avoids cache issues entirely.

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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

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

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.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The website is served through Amazon CloudFront, and the CloudFront distribution cache was not invalidated after the deployment. — The most likely cause is that the static website is served through Amazon CloudFront, and the CloudFront distribution cache was not invalidated after the deployment. Even though the S3 bucket contents are updated via 's3 sync', CloudFront caches objects at edge locations based on TTL settings. Without a cache invalidation request, users continue to receive the old cached content until the TTL expires or the cache is manually cleared.

What should I do if I get this DOP-C02 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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This DOP-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 DOP-C02 exam.