DOP-C02 Security and Compliance Practice Question
Exhibit
Refer to the exhibit.
```
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": "*",
"Action": "s3:GetObject",
"Resource": "arn:aws:s3:::my-public-bucket/*"
},
{
"Effect": "Deny",
"Principal": "*",
"Action": "s3:*",
"Resource": "arn:aws:s3:::my-public-bucket/*",
"Condition": {
"StringNotEquals": {
"aws:SourceIp": "192.0.2.0/24"
}
}
}
]
}
```An S3 bucket has the above bucket policy. What is the net effect on GetObject requests?
⚠ Common exam trap
The trap is reading Principal "*" and jumping to 'public access' or 'all denied' without noticing the Condition block — DOP-C02 frequently tests whether you evaluate the entire policy statement, including conditions, before deciding the net effect.
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
✓
Only requests from IP range 192.0.2.0/24 are allowed
The bucket policy grants s3:GetObject to everyone (Principal "*") but wraps it in a Condition restricting the source to the 192.0.2.0/24 CIDR via aws:SourceIp. Because the Allow statement is conditional, only requests originating from that IP range satisfy the policy and are permitted; all other requests are implicitly denied since S3 is deny-by-default. The net effect is that GetObject succeeds only for callers inside 192.0.2.0/24.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
All anonymous users can read objects
Why it's wrong here
The policy's Allow statement uses Principal "*", which includes anonymous users, but the accompanying Deny statement with Condition {NotIpAddress: {aws:SourceIp: "192.0.2.0/24"}} blocks every request that does not originate from that CIDR. Because an explicit deny overrides any allow, anonymous clients outside the range are rejected. Therefore the statement 'all anonymous users can read objects' is false; only anonymous visitors whose IP falls inside the range can access objects.
- ✗
All requests are denied
Why it's wrong here
Not all requests are denied. A request arriving from an IP address within 192.0.2.0/24 will match the Allow statement and will not satisfy the NotIpAddress condition on the Deny statement, so the Deny does not apply. Since the explicit deny only targets source IPs outside the allowed range, requests from the specified CIDR are permitted. Thus the bucket policy grants access to that restricted set rather than blocking everything.
- ✓
Only requests from IP range 192.0.2.0/24 are allowed
Why this is correct
The net effective policy is that only clients with source IP addresses in 192.0.2.0/24 are permitted to read objects. The Allow statement grants s3:GetObject to Principal "*", but the Deny statement with NotIpAddress of that range blocks all other source IPs; because explicit deny overrides allow, the condition on the deny becomes the controlling factor. This creates a whitelist: any request not coming from 192.0.2.0/24, even an authenticated AWS identity, is denied, while any request from that range, including anonymous users, is allowed.
- ✗
Only authenticated users can read objects
Why it's wrong here
The policy does not evaluate authentication or IAM identity; its condition is solely based on aws:SourceIp. Because Principal "*" explicitly includes unauthenticated users and no condition such as aws:userid or aws:username is present, an anonymous request from 192.0.2.0/24 would be allowed just like an authenticated one. Therefore saying 'only authenticated users can read objects' is incorrect—the discriminator is the source IP range, not AWS credentials.
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 and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Amazon Web Services exam blueprint
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