- A
Use Amazon CloudFront to serve the website and set CORS headers.
Why wrong: CloudFront can be configured to add CORS headers, but the primary solution is to enable CORS on API Gateway.
- B
Add a CORS configuration to the S3 bucket.
Why wrong: S3 CORS configuration controls access to S3 objects, not to API Gateway endpoints.
- C
Enable CORS on the API Gateway API.
API Gateway must have CORS enabled to accept cross-origin requests from the browser.
- D
Configure the S3 bucket policy to allow cross-origin access.
The S3 bucket policy can grant access to the bucket content, but for API calls, CORS must be set on the API.
- E
Modify the Lambda function to include CORS headers in the response.
Why wrong: Lambda functions return responses to API Gateway; API Gateway is responsible for adding CORS headers.
DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 developer is configuring an Amazon S3 bucket for static website hosting. The website includes JavaScript that makes AJAX calls to an API Gateway endpoint. Which TWO actions should the developer take to allow cross-origin requests?
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
Enable CORS on the API Gateway API.
Options A and C are correct. Option A: S3 bucket policy can allow cross-origin access to the bucket itself, but for API Gateway, CORS must be enabled on the API. Option B is incorrect because the CORS configuration should be on the API Gateway, not the S3 bucket. Option C: Enabling CORS on API Gateway allows the browser to make cross-origin requests. Option D is incorrect because CloudFront does not inherently handle CORS; it must be configured. Option E is incorrect because Lambda functions do not handle CORS directly; API Gateway does.
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.
- ✗
Use Amazon CloudFront to serve the website and set CORS headers.
Why it's wrong here
CloudFront can be configured to add CORS headers, but the primary solution is to enable CORS on API Gateway.
- ✗
Add a CORS configuration to the S3 bucket.
Why it's wrong here
S3 CORS configuration controls access to S3 objects, not to API Gateway endpoints.
- ✓
Enable CORS on the API Gateway API.
Why this is correct
API Gateway must have CORS enabled to accept cross-origin requests from the browser.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Configure the S3 bucket policy to allow cross-origin access.
Why this is correct
The S3 bucket policy can grant access to the bucket content, but for API calls, CORS must be set on the API.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Modify the Lambda function to include CORS headers in the response.
Why it's wrong here
Lambda functions return responses to API Gateway; API Gateway is responsible for adding CORS headers.
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 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.
What to study next
Got this wrong? Here's your next step.
Identify which DVA-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.
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Development with AWS Services — study guide chapter
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable CORS on the API Gateway API. — Options A and C are correct. Option A: S3 bucket policy can allow cross-origin access to the bucket itself, but for API Gateway, CORS must be enabled on the API. Option B is incorrect because the CORS configuration should be on the API Gateway, not the S3 bucket. Option C: Enabling CORS on API Gateway allows the browser to make cross-origin requests. Option D is incorrect because CloudFront does not inherently handle CORS; it must be configured. Option E is incorrect because Lambda functions do not handle CORS directly; API Gateway does.
What should I do if I get this DVA-C02 question wrong?
Identify which DVA-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.
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 →
Last reviewed: Jun 20, 2026
This DVA-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 DVA-C02 exam.
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