This CC practice question tests your understanding of security principles. 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.
Network Topology
A cloud security engineer reviews the following S3 bucket policy. What is the primary security risk?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The bucket is publicly readable, allowing anyone to access its contents
Option A is correct because the policy allows any anonymous user to read any object in the bucket (Principal: * without condition). Option B is wrong because write access is not granted. Option C is wrong because the risk is unauthorized read, not deletion. Option D is wrong; encryption is not addressed here.
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 bucket does not have encryption enabled
Why it's wrong here
Encryption is not covered in the policy; the risk is public access.
✗
The bucket policy permits deletion of objects by anyone
Why it's wrong here
No delete action is specified.
✗
The bucket allows unauthorized users to write objects
Why it's wrong here
Only GetObject is allowed, not PutObject.
✓
The bucket is publicly readable, allowing anyone to access its contents
Why this is correct
Principal: * allows anonymous access, and GetObject permits reading.
Clue confirmation
The clue word "primary" in the question point toward this answer.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CC question in full detail.
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 CC ACL questions on filtering logic and placement.
Security Principles — This question tests Security Principles — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The bucket is publicly readable, allowing anyone to access its contents — Option A is correct because the policy allows any anonymous user to read any object in the bucket (Principal: * without condition). Option B is wrong because write access is not granted. Option C is wrong because the risk is unauthorized read, not deletion. Option D is wrong; encryption is not addressed here.
What should I do if I get this CC 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 CC ACL questions on filtering logic and placement.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Standard ACLs match source addresses.
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