- A
AWS Config with an AWS Config rule and an automatic remediation action
AWS Config can evaluate resource configurations against rules (e.g., 's3-bucket-public-read-prohibited') and automatically trigger a remediation action, such as an SSM Automation document, to fix non-compliant resources like S3 buckets without manual intervention. This matches the requirement.
- B
Amazon GuardDuty
Why wrong: Amazon GuardDuty is a threat detection service that identifies suspicious activity and potential security threats using machine learning. It does not evaluate or remediate resource configuration compliance such as S3 bucket public access settings.
- C
AWS CloudTrail
Why wrong: AWS CloudTrail records API calls made in the AWS account for auditing, governance, and security analysis. It does not proactively check resource configurations or apply automatic remediation.
- D
AWS Identity and Access Management (IAM)
Why wrong: AWS IAM manages users, groups, roles, and policies to control access to AWS services and resources. It does not monitor or enforce configuration compliance on resources like S3 buckets.
AWS Config Remediation for S3 Public Access
This CLF-C02 practice question tests your understanding of security and compliance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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's compliance team needs to enforce a policy that all Amazon S3 buckets must have 'Block all public access' enabled. If a bucket is created without this setting, the company wants the policy to be automatically remediated within minutes without manual intervention. The solution must check for compliance continuously and apply the fix automatically. Which AWS service should the company use to meet these requirements?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
AWS Config with an AWS Config rule and an automatic remediation action
AWS Config can continuously evaluate the configuration of S3 buckets against a managed rule like 's3-bucket-public-read-prohibited' or 's3-bucket-public-write-prohibited'. When a noncompliant bucket is detected, AWS Config can automatically trigger a remediation action using an AWS Systems Manager Automation document (e.g., 'AWS-DisableS3BucketPublicReadWrite') to enable 'Block all public access' within minutes, without manual intervention.
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 Config with an AWS Config rule and an automatic remediation action
Why this is correct
AWS Config can evaluate resource configurations against rules (e.g., 's3-bucket-public-read-prohibited') and automatically trigger a remediation action, such as an SSM Automation document, to fix non-compliant resources like S3 buckets without manual intervention. This matches the requirement.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon GuardDuty
Why it's wrong here
Amazon GuardDuty is a threat detection service that identifies suspicious activity and potential security threats using machine learning. It does not evaluate or remediate resource configuration compliance such as S3 bucket public access settings.
When this WOULD be correct
A company needs to detect and alert on suspicious API calls or unauthorized access attempts to S3 buckets, such as repeated failed login attempts or data exfiltration patterns. GuardDuty would be the correct service to use.
- ✗
AWS CloudTrail
Why it's wrong here
AWS CloudTrail records API calls made in the AWS account for auditing, governance, and security analysis. It does not proactively check resource configurations or apply automatic remediation.
When this WOULD be correct
A company needs to audit all API calls that create or modify S3 bucket policies for security analysis and must retain those logs for 90 days. AWS CloudTrail would be the correct service to capture and store the API activity.
- ✗
AWS Identity and Access Management (IAM)
Why it's wrong here
AWS IAM manages users, groups, roles, and policies to control access to AWS services and resources. It does not monitor or enforce configuration compliance on resources like S3 buckets.
When this WOULD be correct
A question requiring enforcement of a policy that only specific IAM roles can create S3 buckets, using IAM policies with conditions to deny creation unless 'Block all public access' is enabled.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓AWS Config with an AWS Config rule and an automatic remediation actionCorrect answer▾
Why this is correct
AWS Config can evaluate resource configurations against rules (e.g., 's3-bucket-public-read-prohibited') and automatically trigger a remediation action, such as an SSM Automation document, to fix non-compliant resources like S3 buckets without manual intervention. This matches the requirement.
✗Amazon GuardDutyWrong answer — click to see why▾
Why this is wrong here
Amazon GuardDuty is a threat detection service that monitors for malicious activity, not a compliance enforcement tool. It cannot automatically remediate S3 bucket public access settings.
★ When this WOULD be the correct answer
A company needs to detect and alert on suspicious API calls or unauthorized access attempts to S3 buckets, such as repeated failed login attempts or data exfiltration patterns. GuardDuty would be the correct service to use.
Why candidates choose this
Candidates may confuse GuardDuty's security monitoring capabilities with compliance enforcement, thinking it can also block public access, or they may assume any security service can handle compliance rules.
✗AWS CloudTrailWrong answer — click to see why▾
Why this is wrong here
AWS CloudTrail records API activity but does not continuously evaluate resource compliance or automatically remediate misconfigurations. It lacks built-in rules for S3 public access and cannot apply fixes.
★ When this WOULD be the correct answer
A company needs to audit all API calls that create or modify S3 bucket policies for security analysis and must retain those logs for 90 days. AWS CloudTrail would be the correct service to capture and store the API activity.
Why candidates choose this
Candidates may think CloudTrail can detect and respond to policy violations because it logs S3 configuration changes, but they overlook that it provides no automated remediation or continuous compliance evaluation.
✗AWS Identity and Access Management (IAM)Wrong answer — click to see why▾
Why this is wrong here
IAM is used for managing user permissions and access control, not for continuous compliance monitoring or automatic remediation of S3 bucket configurations.
★ When this WOULD be the correct answer
A question requiring enforcement of a policy that only specific IAM roles can create S3 buckets, using IAM policies with conditions to deny creation unless 'Block all public access' is enabled.
Why candidates choose this
Candidates may think IAM can enforce all security policies because it controls permissions, but it lacks the continuous monitoring and automated remediation capabilities needed here.
Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS Config's compliance and remediation capabilities with CloudTrail's logging or GuardDuty's threat detection, failing to recognize that only AWS Config provides continuous evaluation with automatic remediation actions.
Detailed technical explanation
How to think about this question
AWS Config remediation actions rely on AWS Systems Manager Automation runbooks, which are predefined or custom workflows that execute API calls (e.g., PutPublicAccessBlock) to fix noncompliant resources. The evaluation frequency can be set to proactive (e.g., every 1 hour) or triggered by configuration changes, ensuring near-real-time detection. In a real-world scenario, if a developer creates a bucket via the AWS CLI without specifying the public access block, AWS Config flags it within minutes and the remediation action automatically applies the block, preventing data exposure.
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS Config with an AWS Config rule and an automatic remediation action — AWS Config can continuously evaluate the configuration of S3 buckets against a managed rule like 's3-bucket-public-read-prohibited' or 's3-bucket-public-write-prohibited'. When a noncompliant bucket is detected, AWS Config can automatically trigger a remediation action using an AWS Systems Manager Automation document (e.g., 'AWS-DisableS3BucketPublicReadWrite') to enable 'Block all public access' within minutes, without manual intervention.
What should I do if I get this CLF-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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Last reviewed: Jun 11, 2026
This CLF-C02 practice question is part of Courseiva's free Amazon Web Services 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 CLF-C02 exam.
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