Exam : SCS-C03
Title : AWS Certified Security -
Specialty
https://www.passcert.com/SCS-C03.html
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1.A security administrator is setting up a new AWS account. The security administrator wants to secure
the data that a company stores in an Amazon S3 bucket. The security administrator also wants to reduce
the chance of unintended data exposure and the potential for misconfiguration of objects that are in the
S3 bucket.
Which solution will meet these requirements with the LEAST operational overhead?
A. Configure the S3 Block Public Access feature for the AWS account.
B. Configure the S3 Block Public Access feature for all objects that are in the bucket.
C. Deactivate ACLs for objects that are in the bucket.
D. Use AWS PrivateLink for Amazon S3 to access the bucket.
Answer: A
Explanation:
Amazon S3 Block Public Access configured at the AWS account level is the recommended and most
effective approach to protect data stored in Amazon S3 while minimizing operational overhead. AWS
Security Specialty documentation explains that S3 Block Public Access provides centralized, preventative
controls designed to block public access to S3 buckets and objects regardless of individual bucket
policies or object-level ACL configurations. When enabled at the account level, these controls
automatically apply to all existing and newly created buckets, significantly reducing the risk of accidental
exposure caused by misconfigured permissions.
The AWS Certified Security – Specialty Study Guide emphasizes that public access misconfiguration is a
leading cause of data leaks in cloud environments. Account-level S3 Block Public Access acts as a
guardrail by overriding any attempt to grant public permissions through bucket policies or ACLs. This
eliminates the need to manage security settings on a per-bucket or per-object basis, thereby reducing
administrative complexity and human error.
Configuring Block Public Access at the object level, as in option B, requires continuous monitoring and
manual configuration, which increases operational overhead. Disabling ACLs alone, as described in
option C, does not fully prevent public access because bucket policies can still allow public permissions.
Using AWS PrivateLink, as in option D, controls network access but does not protect against public
exposure through misconfigured S3 policies.
AWS security best practices explicitly recommend enabling S3 Block Public Access at the account level
as the primary mechanism for preventing unintended public data exposure with minimal management
effort.
Referenced AWS Specialty Documents:
AWS Certified Security – Specialty Official Study Guide
Amazon S3 Security Best Practices Documentation
Amazon S3 Block Public Access Overview
AWS Well-Architected Framework – Security Pillar
2.A company’s developers are using AWS Lambda function URLs to invoke functions directly. The
company must ensure that developers cannot configure or deploy unauthenticated functions in production
accounts. The company wants to meet this requirement by using AWS Organizations. The solution must
not require additional work for the developers.
Which solution will meet these requirements?
A. Require the developers to configure all function URLs to support cross-origin resource sharing (CORS)
when the functions are called from a different domain.
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