DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. 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 developer needs an S3 upload workflow where clients upload large files directly to S3 without exposing AWS credentials through the browser. What should the backend generate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Pre-signed URLs with appropriate expiration and object restrictions
Pre-signed URLs allow the backend to generate time-limited, permission-restricted URLs that clients can use to upload objects directly to S3 without exposing AWS credentials. The backend signs the URL with IAM credentials, and the client uses the URL to perform the PUT operation, ensuring secure, credential-free uploads.
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.
✓
Pre-signed URLs with appropriate expiration and object restrictions
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
✗
Long-lived IAM access keys for each client
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
✗
A public-read bucket policy
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
✗
An S3 Inventory report
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse pre-signed URLs with public bucket policies or long-lived keys, thinking that any form of direct access requires exposing credentials, when in fact pre-signed URLs provide temporary, scoped access without credential leakage.
Detailed technical explanation
How to think about this question
Pre-signed URLs are generated using the AWS Signature Version 4 signing process, where the backend computes a signature with its IAM credentials and embeds it in the URL along with expiration time and allowed HTTP method (e.g., PUT). The client can then upload the file via a standard HTTP PUT request to the pre-signed URL, and S3 validates the signature and expiration before accepting the upload. This approach is commonly used in serverless architectures with AWS Lambda and API Gateway to offload large file uploads from the backend.
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.
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.
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: Pre-signed URLs with appropriate expiration and object restrictions — Pre-signed URLs allow the backend to generate time-limited, permission-restricted URLs that clients can use to upload objects directly to S3 without exposing AWS credentials. The backend signs the URL with IAM credentials, and the client uses the URL to perform the PUT operation, ensuring secure, credential-free uploads.
What should I do if I get this DVA-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.
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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.
Question Discussion
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