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| Certification Vendor: | Amazon AWS |
|---|---|
| Exam Name: | AWS Certified Security - Specialty |
| Exam Number: | SCS-C03 |
| Available Languages: | Japanese, Korean, Simplified Chinese, English, Traditional Chinese |
| Related Certifications: | AWS Certified Security - Specialty (SCS-C02) AWS Certified Solutions Architect - Associate AWS Certified SysOps Administrator - Associate |
| Certificate Validity Period: | 3 years |
| Exam Price: | 300 USD |
| Exam Format: | Ordering, Multiple choice, Matching, Multiple response |
| Exam Duration: | 170 minutes |
| Passing Score: | 750 (scaled score 100–1000) |
| Real Exam Qty: | 65 (50 scored, 15 unscored) |
| Recommended Training: | AWS Security Specialty Official Training |
| Exam Registration: | AWS Certification Registration |
| Sample Questions: | Amazon SCS-C03 Sample Questions |
| Exam Way: | Online proctored or onsite testing center |
| Pre Condition: | Recommended: 3–5 years of experience securing cloud solutions; prior knowledge of AWS services and security best practices; AWS Certified Solutions Architect - Associate or AWS Certified SysOps Administrator - Associate is highly recommended |
| Official Syllabus URL: | https://docs.aws.amazon.com/aws-certification/latest/security-specialty-03/security-specialty-03.html |
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NEW QUESTION # 241
A company uses AWS Organizations to manage the company's AWS accounts. The company's security team needs to implement preventive controls to deny the use of account- level root credentials. The solution must minimize the risk that an AWS account root user could be compromised. The solution must also minimize the effort needed to manage root access.
Which solution will meet these requirements?
Answer: B
Explanation:
Centralized root access management in IAM is the correct preventive control because it lets an organization centrally manage privileged root user credentials for member accounts. AWS documentation states that after centralizing root access, an organization can delete root user credentials from member accounts, including passwords, access keys, signing certificates, and MFA configuration. New accounts created in AWS Organizations have no root credentials by default. This directly reduces compromise risk and removes the operational burden of rotating or monitoring root credentials in every account. Lambda cannot truly disable the root user cleanly.
Security Hub CSPM does not provide this root access management function. SCPs can deny many root actions, but they do not remove long-term root credentials and still leave credential- management overhead.
NEW QUESTION # 242
A company that uses AWS Organizations is using AWS IAM Identity Center to administer access to AWS accounts. A security engineer is creating a custom permission set in IAM Identity Center.
The company will use the permission set across multiple accounts. An AWS managed policy and a customer managed policy are attached to the permission set. The security engineer has full administrative permissions and is operating in the management account.
When the security engineer attempts to assign the permission set to an IAM Identity Center user who has access to multiple accounts, the assignment fails.
What should the security engineer do to resolve this failure?
Answer: D
Explanation:
AWS IAM Identity Center permission sets that include customer managed policies require those policies to exist in each target account. According to the AWS Certified Security - Specialty Study Guide, customer managed policies are account-scoped and are not automatically propagated across accounts by Identity Center.
When assigning a permission set across multiple accounts, Identity Center attempts to attach the referenced customer managed policy in each account. If the policy does not exist, the assignment fails. Creating the same customer managed policy with identical name and permissions in every target account resolves the issue.
Option B increases complexity. Option C does not address the root cause. Option D violates Identity Center management best practices.
AWS documentation clearly states that customer managed policies must be present in all accounts where permission sets are applied.
NEW QUESTION # 243
A security engineer receives a notice about suspicious activity from a Linux-based Amazon EC2 instance that uses Amazon Elastic Block Store (Amazon EBS)-based storage. The instance is making connections to known malicious addresses.
The instance is in a development account within a VPC that is in the us-east-1 Region. The VPC contains an internet gateway and has a subnet in us-east-1a and us-east-1b. Each subnet is associated with a route table that uses the internet gateway as a default route. Each subnet also uses the default network ACL. The suspicious EC2 instance runs within the us-east-1b subnet. During an initial investigation, a security engineer discovers that the suspicious instance is the only instance that runs in the subnet.
Which response will immediately mitigate the attack and help investigate the root cause?
Answer: B
Explanation:
AWS incident response best practices emphasize immediate containment, preservation of evidence, and safe forensic investigation. According to the AWS Certified Security - Specialty Study Guide, when an EC2 instance is suspected of compromise, security teams should avoid logging in to the instance or installing additional tools, as these actions can alter evidence and increase risk.
Terminating the compromised instance after ensuring that its Amazon EBS volumes are preserved prevents further malicious activity immediately. By setting the EBS volumes to not delete on termination, all disk data is retained for forensic analysis. Launching a new, clean EC2 instance in a different subnet or Availability Zone with preinstalled diagnostic tools allows investigators to safely attach and analyze the compromised volumes without executing potentially malicious code.
Option A introduces significant risk by logging in to the compromised instance and modifying security controls during active compromise. Option B delays containment and allows continued outbound traffic during investigation steps. Option D is invalid because AWS WAF cannot be attached directly to Amazon EC2 instances and does not control outbound traffic.
AWS documentation strongly recommends isolating or terminating compromised resources and performing offline analysis using detached storage volumes. This approach ensures immediate mitigation, preserves forensic integrity, and aligns with AWS incident response frameworks.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
AWS Incident Response Best Practices
Amazon EC2 and EBS Forensics Guidance
AWS Well-Architected Framework - Security Pillar
NEW QUESTION # 244
A company is running a containerized application on an Amazon Elastic Container Service (Amazon ECS) cluster that uses AWS Fargate. The application runs as several ECS services. The ECS services are in individual target groups for an internet-facing Application Load Balancer (ALB). The ALB is the origin for an Amazon CloudFront distribution. An AWS WAF web ACL is associated with the CloudFront distribution.
Web clients access the ECS services through the CloudFront distribution. The company learns that the web clients can bypass the web ACL and can access the ALB directly.
Which solution will prevent the web clients from directly accessing the ALB?
Answer: D
Explanation:
The correct solution is option D because it effectively prevents direct access to the internet-facing ALB while allowing legitimate traffic that originates from Amazon CloudFront. By configuring CloudFront to include a custom HTTP header (such as X-Shared-Secret) in all origin requests, and then configuring ALB listener rules to only forward requests that contain the expected header value, the ALB will reject any requests that bypass CloudFront.
This approach is a documented AWS best practice when CloudFront is placed in front of an ALB and AWS WAF is associated with the CloudFront distribution. AWS WAF only evaluates traffic that flows through CloudFront; therefore, preventing direct access to the ALB is critical to ensure that all requests are inspected by the web ACL.
Option A is invalid because CloudFront does not support AWS PrivateLink endpoints as origins. Option B is incorrect because CloudFront cannot use an internal ALB as an origin; CloudFront requires a publicly reachable origin. Option C is not recommended because CloudFront IP ranges change frequently, making IP- based allow lists operationally complex and error-prone, and AWS does not provide a supported CloudFront prefix list for ALB listener rules.
AWS Security Specialty guidance explicitly recommends using custom origin headers to restrict ALB access to CloudFront-only traffic, making option D the correct and secure solution.
NEW QUESTION # 245
A company has AWS accounts in an organization in AWS Organizations. An Amazon S3 bucket in one account is publicly accessible. A security engineer must remove public access and ensure the bucket cannot be made public again.
Which solution will meet these requirements?
Answer: D
Explanation:
Amazon S3 Block Public Access provides centralized controls to prevent public access through bucket policies and ACLs. AWS Certified Security - Specialty guidance recommends enabling Block Public Access to reduce accidental exposure and to enforce guardrails that override public grants. Enabling Block Public Access on the bucket removes current public exposure when combined with correcting policies/ACLs and prevents future misconfiguration. To ensure the bucket cannot be made public again, the security engineer must prevent principals from disabling Block Public Access. An SCP that denies s3:PutPublicAccessBlock prevents changes that would remove or weaken the PublicAccessBlock configuration, enforcing the guardrail across the OU or account. Options A and D do not directly address public exposure control. Option B denies object reads but does not ensure public access cannot be re-enabled; it also does not address the root misconfiguration pathways and could disrupt legitimate access patterns. Option C specifically combines the correct preventive control (PublicAccessBlock) with organizational enforcement to stop future reversal.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
Amazon S3 Block Public Access
AWS Organizations SCP Guardrails for S3 Controls
NEW QUESTION # 246
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