S3 Bucket Policy IP Restriction Allowing Anonymous Access
This ANS-C01 practice question tests your understanding of network security, compliance and governance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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.
Refer to the exhibit. A security engineer is reviewing this S3 bucket policy. The bucket contains sensitive data that should only be accessible from the corporate network (192.0.2.0/24). What is a potential security issue with this policy?
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 require authentication; anonymous access is allowed from the specified IP range
The correct answer is C. The policy allows any principal (Principal: '*') to perform the s3:GetObject action under the condition that the request comes from the specified IP range. However, this condition only checks the IP address; it does not require authentication. If the bucket is publicly accessible (no bucket policy or ACL denying anonymous access), then unauthenticated requests from the allowed IP range would be allowed, which is a security issue. Option A is wrong because the condition belongs on the Action element, not the Principal. Option B is wrong because the Resource ARN includes the bucket name correctly (arn:aws:s3:::example-bucket/*). Option D is wrong because the IP range is specific and appropriate for the requirement.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 condition should be applied to the Principal element
Why it's wrong here
Conditions are applied to the statement, not to the principal directly.
✗
The Resource ARN is missing the bucket name
Why it's wrong here
The ARN is correct: arn:aws:s3:::example-bucket/*
✓
The policy does not require authentication; anonymous access is allowed from the specified IP range
Why this is correct
The Principal is "*", which includes anonymous users.
Related concept
Standard ACLs match source addresses.
✗
The IP address range is not specific enough
Why it's wrong here
The range is specific and correct for the corporate network.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
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
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related ANS-C01 ACL questions on filtering logic and placement.
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The policy does not require authentication; anonymous access is allowed from the specified IP range — The correct answer is C. The policy allows any principal (Principal: '*') to perform the s3:GetObject action under the condition that the request comes from the specified IP range. However, this condition only checks the IP address; it does not require authentication. If the bucket is publicly accessible (no bucket policy or ACL denying anonymous access), then unauthenticated requests from the allowed IP range would be allowed, which is a security issue. Option A is wrong because the condition belongs on the Action element, not the Principal. Option B is wrong because the Resource ARN includes the bucket name correctly (arn:aws:s3:::example-bucket/*). Option D is wrong because the IP range is specific and appropriate for the requirement.
What should I do if I get this ANS-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related ANS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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