ANS-C01 Network Security, Compliance and Governance Practice Question
Exhibit
Refer to the exhibit.
```
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": "*",
"Action": [
"s3:GetObject"
],
"Resource": "arn:aws:s3:::my-bucket/*",
"Condition": {
"IpAddress": {
"aws:SourceIp": "203.0.113.0/24"
}
}
}
]
}
```Refer to the exhibit. A company has an S3 bucket policy that allows public read access only from a specific IP range (203.0.113.0/24). Users outside this range report that they can still access objects in the bucket. What is the most likely reason?
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 bucket also has a bucket ACL that grants public read access, overriding the policy condition
The most likely reason is that the bucket also has a bucket ACL that grants public read access. When both a bucket policy and an ACL are present, the effective permissions are the union of allowed actions. If the ACL allows everyone to read objects, then the IP restriction in the bucket policy is not effective because the ACL already permits the access. Option D correctly identifies this scenario. Option A is incorrect because the condition key for source IP is aws:SourceIp, not aws:SourceIpAddress, but that is a minor typo; however, the policy would still be evaluated. Option B is incorrect because bucket policies are evaluated regardless of region. Option C is incorrect because server-side encryption does not affect policy evaluation.
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 bucket policy uses the wrong condition key; it should be aws:SourceIpAddress
Why it's wrong here
The correct condition key is aws:SourceIp.
- ✗
The bucket policy is not being evaluated because the bucket is in a different region
Why it's wrong here
Bucket policies are evaluated regardless of region.
- ✗
The bucket is configured with server-side encryption, which prevents the policy from being applied
Why it's wrong here
Encryption does not affect policy evaluation.
- ✓
The bucket also has a bucket ACL that grants public read access, overriding the policy condition
Why this is correct
ACLs can grant public access that bypasses the IP restriction in the bucket policy.
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 ANS-C01 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 ANS-C01 exam.