Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company stores sensitive documents in Amazon S3. The security team wants a preventive control that ensures no S3 bucket in the AWS account can ever be configured with a bucket policy that grants public read or write access. This control must apply automatically to all newly created buckets and to existing buckets, without requiring changes to individual bucket policies. Which AWS feature should the security team use?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
AWS Config with the s3-bucket-public-read-prohibited managed rule
AWS Config is a detective service that evaluates resource configurations against rules. The s3-bucket-public-read-prohibited rule can detect buckets that allow public read access, but it does not prevent the bucket from being created or configured with public access. The scenario explicitly requires a preventive control, not a detective one.
B
Best answer
Amazon S3 Block Public Access at the account level
Amazon S3 Block Public Access provides centralized controls that can be applied at the account level. When enabled, these settings override any bucket-level policies that grant public access, preventing both new and existing buckets from ever being made publicly accessible. This is the preventive control described in the scenario.
C
Distractor review
AWS Identity and Access Management (IAM) policy with a condition that denies s3:PutBucketPolicy for any action that grants public access
While an IAM policy with a condition key like s3:PutBucketPublicAccessBlock or a specific condition can deny PutBucketPolicy for public grants, it only applies to IAM users and roles that have the policy attached. It does not prevent the account root user or other authorized principals from making buckets public. It also does not apply to existing buckets that were made public before the policy was created. Therefore, it is not a comprehensive preventive control across the entire account.
D
Distractor review
Amazon GuardDuty with a finding suppression rule for S3 public access events
Amazon GuardDuty is a threat detection service that monitors for malicious activity and unauthorized behavior. It can generate findings when an S3 bucket is made public, but it does not prevent the action from occurring. GuardDuty is a detective and response service, not a preventive control.
Common exam trap
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.
Technical deep dive
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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer needs to launch a test server for a new application prototype. The developer logs into the AWS Management Console, selects an Amazon EC2 instance type, configures the security group, and starts the instance. The instance is running within two minutes, and the developer did not need to submit a formal request to the company's IT procurement team or wait for approval from a cloud administrator. Which essential characteristic of cloud computing does this scenario best demonstrate?
Question 2
A solutions architect is planning a new web application on AWS. The workload will include 3 Amazon EC2 instances (t3.medium) running 24/7, an Application Load Balancer, and an Amazon RDS for MySQL db.t3.small database. The architect needs to estimate the monthly cost for the first year, considering different purchasing options (On-Demand, 1-year All Upfront Reserved Instance, and Compute Savings Plan). Which AWS tool should the architect use to create this estimate?
Question 3
A company's development team frequently needs temporary test environments. A developer can log into the AWS Management Console, select an Amazon EC2 instance type, configure storage, and launch the instance within minutes without any interaction with the IT infrastructure team. This capability is an example of which essential characteristic of cloud computing?
Question 4
A company's finance team needs to analyze AWS spending in detail. They require a report that includes hourly cost data for each AWS service, each individual resource (e.g., a specific EC2 instance), and any cost allocation tags applied. The team plans to export this data to an Amazon S3 bucket and then import it into a custom business intelligence (BI) analytics dashboard. Which AWS tool should the finance team use to generate this level of detailed cost data?
Question 5
A company uses AWS for its development environment. The finance team wants to set a monthly budget of $10,000. They want to receive an email notification when the actual costs reach 80% of the budget ($8,000) and again when costs exceed the budget. The team needs a managed AWS service that can automatically send these alerts without requiring custom code or third-party tools. Which AWS service should the team use?
Question 6
A company uses AWS Organizations to manage multiple accounts. The security team needs to enforce a policy that restricts SSH access (port 22) from the internet (0.0.0.0/0) in all VPCs across all accounts. The team wants to centrally define the allowed rules and automatically apply them to newly created VPCs and security groups, while also automatically remediating any existing non-compliant security groups. Which AWS service should the team use?
FAQ
Questions learners often ask
What does this CLF-C02 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Amazon S3 Block Public Access at the account level — This question tests knowledge of preventive security controls for Amazon S3. The scenario requires a preventive, account-wide control that blocks public access at the bucket level. Amazon S3 Block Public Access at the account level is the correct choice because it provides a centralized setting that overrides any bucket-level policies that grant public access. It applies to all existing and new buckets automatically.
What should I do if I get this CLF-C02 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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