The correct answer is that all requests to the bucket are denied regardless of source IP. This occurs because in AWS S3 bucket policies, an explicit Deny always overrides any Allow, even if the request matches the allowed condition—this is the core of the Deny override principle. On the CompTIA SecurityX CAS-004 exam, this concept tests your understanding of IAM policy evaluation logic, where Deny statements are evaluated first and take precedence over Allow statements, a common trap where candidates mistakenly think a specific Allow can bypass a broader Deny. The exhibit’s Deny statement applies to all principals and all actions, so it blocks everything, including GetObject from the allowed 10.0.0.0/8 range. Remember the mnemonic: “Deny denies all, Allow just lets a few fall.”
CAS-004 Security Operations Practice Question
This CAS-004 practice question tests your understanding of security operations. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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
✓
All requests to the bucket are denied regardless of source IP.
Option B is correct. The Deny statement will override the Allow because Deny takes precedence. The Allow only allows GetObject from 10.0.0.0/8, but the Deny all actions for all principals will block all access, including GetObject from the allowed IP range. Option A is wrong because Deny overrides. Option C is wrong because there is an explicit Deny. Option D is wrong because the effect is to deny all, not just outside IPs.
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.
✗
Requests from outside 10.0.0.0/8 are allowed to read objects.
Why it's wrong here
No Allow statement for outside IPs, and Deny blocks all.
✗
All requests from IPs in 10.0.0.0/8 are allowed to read objects.
Why it's wrong here
The explicit Deny overrides the Allow.
✗
Only anonymous requests are denied.
Why it's wrong here
The Deny applies to all principals, including authenticated ones.
✓
All requests to the bucket are denied regardless of source IP.
Why this is correct
The Deny statement applies to all actions and all principals, so it denies everything.
Related concept
Standard ACLs match source addresses.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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 CAS-004 ACL questions on filtering logic and placement.
Security Operations — This question tests Security Operations — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: All requests to the bucket are denied regardless of source IP. — Option B is correct. The Deny statement will override the Allow because Deny takes precedence. The Allow only allows GetObject from 10.0.0.0/8, but the Deny all actions for all principals will block all access, including GetObject from the allowed IP range. Option A is wrong because Deny overrides. Option C is wrong because there is an explicit Deny. Option D is wrong because the effect is to deny all, not just outside IPs.
What should I do if I get this CAS-004 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 CAS-004 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Based on the exhibit, what is the primary purpose of the condition in this IAM policy?
medium
A.Enable encryption in transit for the S3 bucket
B.Allow all incoming traffic to the S3 bucket
C.Deny access from the specified IP ranges
✓ D.Restrict access to requests originating from the specified IP ranges
Why D: Option C is correct because the condition uses aws:SourceIp to restrict access to specific IP ranges. Option A is wrong because it does not allow all traffic. Option B is wrong because it is an Allow policy with condition. Option D is wrong because encryption is not addressed.
Last reviewed: Jun 24, 2026
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This CAS-004 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-004 exam.
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