The AWS Certified Security - Specialty (SCS-C03) exam validates your ability to design, implement, and troubleshoot security solutions on Amazon Web Services. This certification is ideal for security engineers, architects, and cloud professionals who want to demonstrate expertise in AWS security practices. The SCS-C03 covers five major domains: detection and response, infrastructure security, identity and access management, data protection, and security governance. This page provides a structured study guide to help you prepare efficiently and confidently for the exam.
Use this topic map to guide your study for Amazon SCS-C03 (AWS Certified Security - Specialty) within the Amazon Specialty path.
The SCS-C03 exam measures both foundational security knowledge and your ability to apply that knowledge to real-world AWS scenarios. Questions are designed to test your understanding of security concepts, service features, and decision-making in complex environments.
Questions progress in difficulty and emphasize practical application over memorization. Success requires both conceptual understanding and the ability to reason through real-world security decisions.
An effective study routine maps exam topics to weekly goals, incorporates practice questions with detailed review, and includes timed mock exams to build confidence. Dedicate time to hands-on labs and real-world scenarios so you can connect concepts to actual AWS configurations.
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Identity and Access Management and Data Protection typically account for a larger portion of exam questions. However, all five domains are tested, so a balanced study approach is essential. Review the official exam guide to see the percentage weighting for each domain and allocate study time accordingly.
Monitoring and logging provide the visibility needed to detect security events, while incident response procedures define how to act on those detections. In practice, CloudWatch alarms trigger notifications, logs provide forensic evidence, and your incident response plan guides containment and remediation. Understanding this workflow helps you design integrated security solutions.
AWS recommends at least two years of hands-on security experience on AWS. Practical labs in CloudFormation, IAM policy design, KMS key management, and incident simulation are invaluable. If you are new to AWS, complete foundational labs and the AWS Security Fundamentals course before attempting SCS-C03.
Misunderstanding IAM policy evaluation logic, confusing encryption options (KMS vs S3-managed), and overlooking service control policy scope are frequent errors. Additionally, candidates sometimes choose secure options that do not meet specific requirements in scenario questions. Always read scenarios carefully and match solutions to stated constraints.
Review weak areas from your practice tests, refresh your memory on policy syntax and service limits, and take one final timed mock exam. Use the last few days to rest and review high-level concepts rather than learning new material. On exam day, manage your time carefully and flag difficult questions to revisit if time permits.
A security engineer for a company wants to maintain all IAM users and roles according to the principle of least privilege. The security engineer plans to audit the IAM permissions once every 365 days. The security engineer must view the permissions that each IAM identity used in the last 365 days and must remove any unused permissions.
Which solution will meet these requirements?
Comprehensive and Detailed 100to 150 words of Explanation From AWS Certified Security -- Specialty topics: IAM Access Analyzer is the correct service for least-privilege review because it can analyze unused access and last accessed information for IAM identities. AWS documentation states that unused access analyzers can generate findings for access that has not been used within a configured period, with a selectable range up to 365 days. This directly matches the annual audit requirement. CloudTrail logs contain raw activity data, but manually reviewing 365 days of events for each identity is high effort and error-prone. AWS Config tracks configuration changes, not effective permission usage. Trusted Advisor can identify some security risks, but it does not provide the role-level and user-level last accessed analysis needed to remove unused permissions systematically.
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A security engineer wants to forward custom application-security logs from an Amazon EC2 instance to Amazon CloudWatch. The security engineer installs the CloudWatch agent on the EC2 instance and adds the path of the logs to the CloudWatch configuration file.
However, CloudWatch does not receive the logs. The security engineer verifies that the awslogs service is running on the EC2 instance.
What should the security engineer do next to resolve the issue?
The Amazon CloudWatch agent requires explicit IAM permissions to create log groups, create log streams, and put log events into Amazon CloudWatch Logs. According to the AWS Certified Security -- Specialty Study Guide, the most common cause of CloudWatch agent log delivery failures is missing or insufficient IAM permissions on the EC2 instance role.
The CloudWatchAgentServerPolicy AWS managed policy provides the required permissions, including logs:CreateLogGroup, logs:CreateLogStream, and logs:PutLogEvents. Attaching this policy to the EC2 instance role enables the CloudWatch agent to successfully deliver custom application logs without requiring changes to the application or logging configuration.
Options A, B, and C are incorrect because CloudTrail, Amazon S3, and Amazon Inspector are not designed to ingest custom application logs from EC2 instances in this manner. AWS documentation clearly states that IAM permissions must be granted to the EC2 role for CloudWatch Logs ingestion.
This approach aligns with AWS best practices for least privilege while ensuring reliable detection and monitoring capabilities.
Referenced AWS Specialty Documents:
AWS Certified Security -- Specialty Official Study Guide
Amazon CloudWatch Logs Agent Configuration
AWS IAM Best Practices for Monitoring
A company is using an organization with all features enabled in AWS Organizations. The organization contains OUs. The company has configured a delegated administrator account for AWS IAM Identity Center. In this delegated administrator account, the company has deployed an AWS CloudFormation stack that contains permission sets.
A security engineer must implement a solution to prevent the deletion of the CloudFormation stack.
Which solution will meet this requirement?
Comprehensive and Detailed 100to 150 words of Explanation From AWS Certified Security -- Specialty topics: CloudFormation termination protection is the specific feature that prevents a stack from being deleted. If a user attempts to delete a protected stack, the delete operation fails. However, a user with cloudformation:UpdateTerminationProtection could disable the protection and then delete the stack. Therefore, the strongest control is to enable termination protection and use an SCP to deny UpdateTerminationProtection for that stack ARN across the organization. Option B is weaker because it excludes the delegated administrator OU, which is exactly where the stack exists. DeletionPolicy: Retain preserves resources after stack deletion but does not prevent the stack from being deleted. Stack policies control updates to stack resources, not stack deletion.
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A company runs an application on a fleet of Amazon EC2 instances. The application is accessible to users around the world. The company associates an AWS WAF web ACL with an Application Load Balancer (ALB) that routes traffic to the EC2 instances.
A security engineer is investigating a sudden increase in traffic to the application. The security engineer discovers a significant amount of potentially malicious requests coming from hundreds of IP addresses in two countries. The security engineer wants to quickly limit the potentially malicious requests but does not want to prevent legitimate users from accessing the application.
Which solution will meet these requirements?
AWS WAFrate-based rulesare specifically designed to protect applications from traffic floods and distributed attacks that originate from large numbers of IP addresses. According to the AWS Certified Security -- Specialty Official Study Guide, rate-based rules automatically track the number of requests coming from individual IP addresses and temporarily block IPs that exceed a defined threshold.
In this scenario, the malicious traffic originates fromhundreds of IP addresses across two countries, mixed with legitimate user traffic. A rate-based rule allows the security engineer tolimit excessive request rates without fully blocking access from entire geographic regions, ensuring that legitimate users can still access the application.
Option B is incorrect because geographic match rules blockalltraffic from selected countries, which would deny access to legitimate users and violate the stated requirement. Option C is invalid because security groups do not support geographic filtering. Option D is not scalable, as manually blocking hundreds of IP addresses is operationally inefficient and ineffective against rapidly changing attacker IPs.
AWS documentation emphasizes thatrate-based rules are the recommended first-line mitigationfor sudden traffic spikes and potential application-layer DDoS attacks when business continuity must be preserved.
AWS Certified Security -- Specialty Official Study Guide
AWS WAF Developer Guide -- Rate-Based Rules
AWS DDoS Resiliency Best Practices
A company is operating an open-source software platform that is internet facing. The legacy software platform no longer receives security updates. The software platform operates using Amazon Route 53 weighted load balancing to send traffic to two Amazon EC2 instances that connect to an Amazon RDS cluster. A recent report suggests this software platform is vulnerable to SQL injection attacks, with samples of attacks provided. The company's security engineer must secure this system against SQL injection attacks within 24 hours. The security engineer's solution must involve the least amount of effort and maintain normal operations during implementation.
What should the security engineer do to meet these requirements?
Comprehensive and Detailed 100to 150 words of Explanation From AWS Certified Security -- Specialty topics: AWS WAF protects HTTP and HTTPS application traffic by inspecting requests and applying rules such as SQL injection match statements. AWS WAF can be associated with supported resources, including Application Load Balancers, but it cannot be attached directly to EC2 instances. Creating an ALB with the existing EC2 instances as targets preserves normal application operation while allowing the web ACL to inspect and block malicious SQL injection patterns. After testing, Route 53 can be redirected to the ALB, and EC2 security groups should be restricted so users cannot bypass WAF by reaching the instances directly. Patching unsupported legacy software within 24 hours is higher effort and riskier. CloudFront with only one EC2 origin would not preserve the current two-instance weighted design.
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