SCS-C02 exam dumps: questions 301 to 400 of 503

Correct answer: B

• A. Incorrect.

  This step is important to ensure the IAM user has the necessary permissions, but SCPs applied at the OU level can still block actions even if the IAM user has the correct permissions defined in their policies. Therefore, this may not resolve the issue if the SCP is restrictive.

• B. Correct.

  SCPs define the maximum set of permissions allowed for accounts within an OU. If the SCP denies the action, even with proper IAM permissions, the action will still be blocked. Verifying and potentially updating the SCP is the correct approach in this scenario.

• C. Incorrect.

  Service quotas are separate from permission management and are used to control resource limits in AWS. An EC2 service quota would not block permissions for launching a specific instance type.

• D. Incorrect.

  SCPs cannot be overridden by IAM policies, even with 'AdministratorAccess.' SCPs define the maximum permissions, and actions denied by SCPs cannot be performed, regardless of IAM permissions.

Correct answer: B

• A. Incorrect.

  This option grants excessive permissions (full access) to the S3 bucket, violating the principle of least privilege. It is not the best practice for securing AWS resources.

• B. Correct.

  This option follows the principle of least privilege by granting only the necessary permissions (read-only access) and is the recommended approach for authorizing an EC2 instance to access an S3 bucket without hardcoding credentials.

• C. Incorrect.

  This option involves hardcoding credentials into the application code, which is a security risk and violates AWS best practices.

• D. Incorrect.

  While restricting access by IP address can provide some security, this approach does not work for private EC2 instances because S3 bucket policies do not support direct IP-based restrictions for private IPs assigned to EC2 instances.

Correct answer: A

• A. Correct.

  Correct. If an IAM policy is attached to users outside the 'FinanceTeam' group that grants access to the bucket, it will override or complement the bucket policy, potentially allowing unintended access.

• B. Incorrect.

  Incorrect. A bucket policy condition can help refine access but is not required to restrict access to a specific IAM group. The issue is more likely related to IAM policies granting access elsewhere.

• C. Incorrect.

  Incorrect. Logging does not enforce access control; it is used for auditing and monitoring. The absence of logging would not cause unauthorized access.

• D. Incorrect.

  Incorrect. While a disabled Block Public Access setting could make a bucket publicly accessible, the scenario specifies that access is limited to some users outside the designated group, not the entire public.

Correct answer: A

• A. Correct.

  This is the most secure and effective approach. An S3 bucket policy denying PutObject requests without server-side encryption ensures that all objects are encrypted and prevents developers from bypassing encryption requirements.

• B. Incorrect.

  While enabling default encryption with SSE-S3 ensures all objects are encrypted, it doesn't prevent developers from misconfiguring encryption settings during uploads. A bucket policy provides additional enforcement.

• C. Incorrect.

  Requiring client-side encryption ensures encryption but relies on developers to implement it correctly. It also adds complexity for managing encryption keys and processes.

• D. Incorrect.

  S3 Object Lock in Governance mode is used for write-once-read-many (WORM) compliance and data retention, but it does not enforce encryption requirements for uploaded objects.

Correct answers: A, C

• A. Correct.

  Enabling S3 Block Public Access at the bucket level ensures that public access to the specific S3 bucket is blocked, regardless of bucket policies or ACLs. This is an appropriate and effective method to prevent accidental public exposure of sensitive data.

• B. Incorrect.

  Attaching an IAM policy to users denying permission to modify bucket permissions is not a scalable or practical solution, as it may interfere with legitimate administrative tasks and does not directly address the issue of blocking public access.

• C. Correct.

  Enabling S3 Block Public Access at the account level ensures that no S3 bucket in the entire AWS account can be made public, which is a stronger and more comprehensive approach to prevent accidental public exposure.

• D. Incorrect.

  Using an S3 bucket policy to explicitly deny public access could work, but it is less flexible and not as robust as using S3 Block Public Access, which is specifically designed for this purpose.

• E. Incorrect.

  Enabling AWS Config rules to monitor bucket ACL changes is useful for detecting configuration changes, but it does not actively prevent the bucket from being made public.