easyMultiple ChoiceObjective-mapped
CV0-004 Practice Question: Being unable to upload files to an S3 bucket…
Exhibit
Refer to the exhibit.
```json
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": "s3:PutObject",
"Resource": "arn:aws:s3:::my-bucket/*"
}
]
}
```A user reports being unable to upload files to an S3 bucket named 'my-bucket'. The IAM policy attached to the user is shown in the exhibit. What is the most likely reason for the failure?
⚠ Common exam trap
CompTIA often tests the distinction between s3:PutObject and s3:PutObjectAcl, trapping candidates who assume that upload permission alone is sufficient when ACL requirements are enforced.
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 policy does not include s3:PutObjectAcl, which is needed.
The IAM policy grants s3:PutObject, which allows uploading an object, but it does not include s3:PutObjectAcl. When uploading to an S3 bucket, if the bucket is configured to require bucket-owner-full-control ACLs (e.g., via a bucket policy or default settings), the upload will fail unless the user also has permission to set the ACL. The s3:PutObjectAcl action is necessary to specify the ACL during the PUT request, and its absence is the most likely cause of the failure.
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 policy requires a condition that is not met.
Why it's wrong here
No condition in policy.
- ✓
The policy does not include s3:PutObjectAcl, which is needed.
Why this is correct
Many upload operations require PutObjectAcl.
- ✗
The policy has a typo in the Action field.
Why it's wrong here
Action is correct.
- ✗
The bucket policy denies the upload.
Why it's wrong here
Bucket policy not shown; could be OK.
Visual reference
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 |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.