The correct answer is that the bucket policy denies all requests because the IP condition uses a private IP range. This occurs because the policy includes a Deny statement that blocks any request unless the source IP falls within the private CIDR block 10.0.0.0/16, but private IP addresses are non-routable over the public internet, meaning no request originating from outside the VPC can ever satisfy that condition. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of how S3 bucket policies evaluate Deny statements before Allow statements, and it commonly appears as a trick question where examinees overlook that private IPs cannot be the source of internet traffic. A key memory tip is: “Private IPs are for VPCs, not the public internet—if your condition only allows a private range, you’ve effectively denied everyone.”
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Denies all requests because the IP condition uses a private IP range
The bucket policy includes a condition that denies requests unless the source IP is within the private IP range 10.0.0.0/16. Since private IP addresses are not routable over the public internet, any request originating from outside the VPC (i.e., from the internet) will not have a source IP in that range, causing the Deny statement to block the request. This effectively denies all requests because the only allowed IP range is a private CIDR that cannot be the source of a public internet request.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Allows requests from any public IP address
Why it's wrong here
Condition restricts to 10.0.0.0/16.
✗
Allows any request to the bucket
Why it's wrong here
Condition restricts based on IP.
✓
Denies all requests because the IP condition uses a private IP range
Why this is correct
Private IPs are not seen by S3, so the condition never matches.
Related concept
Read the scenario before looking for a memorised answer.
✗
Allows requests only from a VPC with CIDR 10.0.0.0/16
Why it's wrong here
S3 sees public IP, not private IP.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the misconception that a Deny statement with a NotIpAddress condition acts as an Allow for the specified IP range, but candidates forget that the Deny effect overrides any Allow and that private IP ranges cannot be the source of public internet requests, leading them to incorrectly choose Option D.
Detailed technical explanation
How to think about this question
In AWS S3 bucket policies, the combination of a Deny effect with a NotIpAddress condition creates a 'deny all except' rule, but because private IP ranges like 10.0.0.0/8 are non-routable on the public internet, any request from the internet will have a public IP that does not match the condition, triggering the Deny. This is a common pattern to restrict access to only requests originating from within a VPC or from specific private networks, but it requires careful consideration of how source IPs are evaluated—for example, requests from an S3 VPC Endpoint use the endpoint's private IP, not the client's, which can cause unexpected denials.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Denies all requests because the IP condition uses a private IP range — The bucket policy includes a condition that denies requests unless the source IP is within the private IP range 10.0.0.0/16. Since private IP addresses are not routable over the public internet, any request originating from outside the VPC (i.e., from the internet) will not have a source IP in that range, causing the Deny statement to block the request. This effectively denies all requests because the only allowed IP range is a private CIDR that cannot be the source of a public internet request.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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