The answer is to create an AWS Config rule that triggers a custom Lambda function to check bucket policies and publish to SNS. This is the most efficient approach because AWS Config rules are designed for continuous compliance evaluation, and a custom Lambda function provides the logic to inspect the S3 bucket policy for public access statements, then publish findings to an SNS topic for notification. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding that Config rules evaluate resource configurations, not API calls—CloudTrail logs changes but doesn’t assess compliance, and S3 events don’t fire on policy modifications by default. A common trap is confusing CloudTrail’s ability to detect changes with Config’s ability to evaluate them; remember that Config is the compliance engine, not just an audit trail. Memory tip: “Config checks, Lambda acts, SNS alerts.”
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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.
A company uses AWS Config to record resource changes. The security team wants to be notified when an S3 bucket policy changes to allow public access. What is the most efficient way to achieve this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an AWS Config rule that triggers a custom Lambda function to check bucket policies and publish to SNS.
Option C is correct because AWS Config rules can trigger custom Lambda functions to evaluate resources and send notifications. Option A is wrong because CloudTrail logs API calls but does not directly evaluate resource compliance. Option B is wrong because S3 events do not trigger on policy changes by default. Option D is wrong because Config rules do not directly publish to SNS.
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.
✓
Create an AWS Config rule that triggers a custom Lambda function to check bucket policies and publish to SNS.
Why this is correct
Config rules evaluate resource compliance and can invoke Lambda for remediation or notification.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure S3 event notifications on the bucket to send events to SNS.
Why it's wrong here
S3 event notifications are for object-level events, not policy changes.
✗
Set up an AWS Config rule to directly publish to an SNS topic when noncompliant.
Why it's wrong here
Config rules do not directly publish to SNS; they trigger Lambda or send to SQS.
✗
Enable AWS CloudTrail and create a metric filter for PutBucketPolicy events.
Why it's wrong here
CloudTrail requires additional setup and does not automatically notify.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create an AWS Config rule that triggers a custom Lambda function to check bucket policies and publish to SNS. — Option C is correct because AWS Config rules can trigger custom Lambda functions to evaluate resources and send notifications. Option A is wrong because CloudTrail logs API calls but does not directly evaluate resource compliance. Option B is wrong because S3 events do not trigger on policy changes by default. Option D is wrong because Config rules do not directly publish to SNS.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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