The answer is Amazon Macie with automated discovery jobs and Amazon CloudWatch Events to send alerts. Macie is purpose-built for detecting public read access to S3 buckets by continuously analyzing bucket policies and ACLs for misconfigurations that expose sensitive data, and its automated discovery jobs can scan all buckets without manual intervention. When Macie identifies a bucket with public read access, it publishes findings to CloudWatch Events, which can trigger real-time alerts via SNS or Lambda. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of Macie’s specific role in data security and access visibility, not just general monitoring—a common trap is choosing AWS Config or Trusted Advisor, which check compliance but lack Macie’s sensitive data context and automated alerting integration. Remember the mnemonic: Macie Monitors Access, CloudWatch Catches Alerts.
SCS-C02 Threat Detection and Incident Response Practice Question
This SCS-C02 practice question tests your understanding of threat detection and incident response. 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 Amazon S3 to store sensitive data. The security team wants to detect and alert on public read access to S3 buckets. Which combination of AWS services is MOST appropriate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon Macie with automated discovery jobs and Amazon CloudWatch Events to send alerts.
Amazon Macie is purpose-built for discovering and protecting sensitive data in S3, and its automated discovery jobs can detect public read access to buckets. By integrating with Amazon CloudWatch Events, Macie can trigger alerts in real-time when such access is identified, making it the most appropriate choice for this detection and alerting requirement.
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.
✗
AWS CloudTrail and Amazon CloudWatch Logs with metric filters for `PutBucketPolicy` events.
Why it's wrong here
Logs changes but does not detect existing public access.
✓
Amazon Macie with automated discovery jobs and Amazon CloudWatch Events to send alerts.
Why this is correct
Macie can evaluate bucket policies and alert on public access.
Related concept
Read the scenario before looking for a memorised answer.
✗
Amazon GuardDuty and AWS Lambda.
Why it's wrong here
GuardDuty detects threats, not configuration issues.
✗
AWS Config with managed rules like `s3-bucket-public-read-prohibited` and Amazon SNS.
Why it's wrong here
Config rules check configuration, but Macie is better for sensitive data discovery and public access detection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS Config's compliance evaluation (which is periodic and reactive) with real-time detection and alerting, or they mistakenly believe CloudTrail captures all public access events, when in fact it only logs API calls that change permissions, not the resulting access state.
Detailed technical explanation
How to think about this question
Amazon Macie uses machine learning and pattern matching to automatically discover sensitive data and assess S3 bucket security settings, including public read access via bucket policies, ACLs, or access point configurations. It integrates with Amazon EventBridge (formerly CloudWatch Events) to send events when a bucket is found to be publicly readable, enabling automated remediation workflows. In a real-world scenario, Macie can detect a bucket that was accidentally made public via a misconfigured ACL, which CloudTrail might not flag if the ACL change was made outside of a `PutBucketPolicy` API call.
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.
Threat Detection and Incident Response — This question tests Threat Detection and Incident Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon Macie with automated discovery jobs and Amazon CloudWatch Events to send alerts. — Amazon Macie is purpose-built for discovering and protecting sensitive data in S3, and its automated discovery jobs can detect public read access to buckets. By integrating with Amazon CloudWatch Events, Macie can trigger alerts in real-time when such access is identified, making it the most appropriate choice for this detection and alerting requirement.
What should I do if I get this SCS-C02 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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