mediumMultiple ChoiceObjective-mapped
CAS-004 An IAM policy is applied to an AWS user Practice Question
Exhibit
Refer to the exhibit.
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": "s3:ListBucket",
"Resource": "arn:aws:s3:::example-bucket"
},
{
"Effect": "Deny",
"Action": "s3:*",
"Resource": "arn:aws:s3:::secret-bucket"
}
]
}An IAM policy is applied to an AWS user. Which of the following actions is permitted?
⚠ Common exam trap
CompTIA CASP+ often tests the candidate's ability to read the exact resource ARN and action in the policy statement, trapping those who assume all buckets are accessible or that listing implies other permissions.
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
✓
List objects in example-bucket
The IAM policy explicitly allows 's3:ListBucket' on 'example-bucket', so listing objects in that bucket is permitted. The policy does not grant any actions on 'secret-bucket' or any write/delete permissions, so only Option D is allowed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Delete objects in example-bucket
Why it's wrong here
Delete is not allowed; only ListBucket is permitted.
- ✗
Put objects in secret-bucket
Why it's wrong here
The Deny statement blocks all actions on secret-bucket, including PutObject.
- ✗
List objects in secret-bucket
Why it's wrong here
The Deny statement explicitly blocks all actions on secret-bucket.
- ✓
List objects in example-bucket
Why this is correct
The Allow statement grants s3:ListBucket on example-bucket.
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
Related to this question
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 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 CAS-005 exam.