SCS-C02 Security Logging and Monitoring Practice Question
This SCS-C02 practice question tests your understanding of security logging and monitoring. 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.
A company uses AWS Organizations and wants to centralize security logs from all member accounts into a single S3 bucket in the management account. The bucket policy allows only the management account's root user to write objects. However, logs are not being delivered from member accounts. What is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The bucket policy denies write access to all principals except the management account's root user, preventing cross-account writes.
Option D is correct because S3 bucket policies that restrict writes to a specific root user will deny cross-account writes even if the logging service assumes a role. The logging service (e.g., CloudTrail, Config) in a member account must be able to write to the central bucket; the bucket policy must grant permissions to the logging service's service principal or to the member account. Option A is wrong because S3 Transfer Acceleration is not required. Option B is wrong because KMS key policies might be an issue, but the question states the bucket policy is the restriction. Option C is wrong because VPC endpoints are not required for logging.
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.
✗
S3 Transfer Acceleration is not enabled.
Why it's wrong here
Transfer Acceleration is not needed for log delivery.
✗
VPC endpoints are not configured for the logging service.
Why it's wrong here
VPC endpoints are not mandatory for logging.
✗
The S3 bucket uses an AWS KMS key, and the key policy does not grant decrypt permissions to the logging service.
Why it's wrong here
KMS could be a factor, but the bucket policy explicitly restricts writes.
✓
The bucket policy denies write access to all principals except the management account's root user, preventing cross-account writes.
Why this is correct
The bucket policy must allow the logging service principal (e.g., cloudtrail.amazonaws.com) to write objects, or allow the member account.
Clue confirmation
The clue word "most likely" 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 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.
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 SCS-C02 ACL questions on filtering logic and placement.
Security Logging and Monitoring — This question tests Security Logging and Monitoring — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The bucket policy denies write access to all principals except the management account's root user, preventing cross-account writes. — Option D is correct because S3 bucket policies that restrict writes to a specific root user will deny cross-account writes even if the logging service assumes a role. The logging service (e.g., CloudTrail, Config) in a member account must be able to write to the central bucket; the bucket policy must grant permissions to the logging service's service principal or to the member account. Option A is wrong because S3 Transfer Acceleration is not required. Option B is wrong because KMS key policies might be an issue, but the question states the bucket policy is the restriction. Option C is wrong because VPC endpoints are not required for logging.
What should I do if I get this SCS-C02 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 SCS-C02 ACL questions on filtering logic and placement.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Standard ACLs match source addresses.
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