- A
Generate a pre-signed URL for the objects and share the URL with the auditor.
Time-limited and does not require IAM user.
- B
Create an IAM user with a policy granting read-only access to the bucket.
Why wrong: Permanent access, not temporary.
- C
Add a bucket policy that grants read-only access to the auditor's AWS account.
Why wrong: Permanent cross-account access.
- D
Share the access keys of an existing IAM user with the auditor.
Why wrong: Violates security best practices.
Question 1,589 of 1,750
Temporary S3 Access for External Auditor — Pre-Signed URL | AWS DevOps Engineer Professional Explained
This DOP-C02 practice question tests your understanding of security and compliance. 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. A key principle to apply: pre-signed URL. 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 DevOps engineer needs to temporarily grant an external auditor read-only access to a specific S3 bucket for 24 hours. What is the most secure way to grant this access?
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
✓
Generate a pre-signed URL for the objects and share the URL with the auditor.
Option A is correct because a pre-signed URL grants time-limited, read-only access to specific S3 objects without sharing permanent credentials. The URL can be set to expire after 24 hours, aligning with the temporary access requirement. Option B is insecure because it creates a permanent IAM user. Option C is overly broad and permanent, not scoped to 24 hours. Option D violates security best practices by sharing access keys.
Key principle: Pre-signed URL
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Generate a pre-signed URL for the objects and share the URL with the auditor.
Why this is correct
Time-limited and does not require IAM user.
Related concept
Pre-signed URL
- ✗
Create an IAM user with a policy granting read-only access to the bucket.
Why it's wrong here
Permanent access, not temporary.
- ✗
Add a bucket policy that grants read-only access to the auditor's AWS account.
Why it's wrong here
Permanent cross-account access.
- ✗
Share the access keys of an existing IAM user with the auditor.
Why it's wrong here
Violates security best practices.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates may incorrectly choose a bucket policy (C) because it can specify a principal and conditions, but it lacks a time limitation and is permanent unless manually removed. Pre-signed URLs are the only option that automatically expires.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Pre-signed URL
- Time-limited access
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
Pre-signed URL
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.
Review pre-signed URL, then practise related DOP-C02 questions on the same topic to reinforce the concept.
- →
Security and Compliance — study guide chapter
Learn the concepts, then practise the questions
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Security and Compliance practice questions
Targeted practice on this topic area only
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AWS Certified DevOps Engineer Professional DOP-C02 study guide
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DOP-C02 practice test guide
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Security and Compliance — This question tests Security and Compliance — Pre-signed URL.
What is the correct answer to this question?
The correct answer is: Generate a pre-signed URL for the objects and share the URL with the auditor. — Option A is correct because a pre-signed URL grants time-limited, read-only access to specific S3 objects without sharing permanent credentials. The URL can be set to expire after 24 hours, aligning with the temporary access requirement. Option B is insecure because it creates a permanent IAM user. Option C is overly broad and permanent, not scoped to 24 hours. Option D violates security best practices by sharing access keys.
What should I do if I get this DOP-C02 question wrong?
Review pre-signed URL, then practise related DOP-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Pre-signed URL
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Last reviewed: Jun 20, 2026
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