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The Best SCS-C03 - AWS Certified Security - Specialty Latest Exam Forum

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Amazon SCS-C03 Exam Syllabus Topics:

Topic
Details

Topic 1

Infrastructure Security: This domain focuses on securing AWS infrastructure including networks, compute resources, and edge services through secure architectures, protection mechanisms, and hardened configurations.

Topic 2

Detection: This domain covers identifying and monitoring security events, threats, and vulnerabilities in AWS through logging, monitoring, and alerting mechanisms to detect anomalies and unauthorized access.

Topic 3

Security Foundations and Governance: This domain addresses foundational security practices including policies, compliance frameworks, risk management, security automation, and audit procedures for AWS environments.

Topic 4

Data Protection: This domain centers on protecting data at rest and in transit through encryption, key management, data classification, secure storage, and backup mechanisms.

Topic 5

Identity and Access Management: This domain deals with controlling authentication and authorization through user identity management, role-based access, federation, and implementing least privilege principles.

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2026 SCS-C03: AWS Certified Security - Specialty –Valid Latest Exam Forum

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Amazon AWS Certified Security - Specialty Sample Questions (Q127-Q132):

NEW QUESTION # 127
A corporate cloud security policy states that communications between the company ' s VPC and KMS must travel entirely within the AWS network and not use public service endpoints.
Which combination of the following actions MOST satisfies this requirement? (Select TWO.)

A. Create a VPC endpoint for AWS KMS withprivate DNS enabled.
B. Remove the VPC internet gateway from the VPC and add a virtual private gateway to the VPC to prevent direct, public internet connectivity.
C. Add theaws:sourceVpcecondition to the AWS KMS key policy referencing the company ' s VPC endpoint ID.
D. Add the following condition to the AWS KMS key policy: " aws:SourceIp " : " 10.0.0.0/16 " .
E. Use the KMS Import Key feature to securely transfer the AWS KMS key over a VPN.

Answer: A,C

Explanation:
To ensure traffic from a VPC to AWS KMS stays on the AWS network and does not use public endpoints, you should use aninterface VPC endpoint (AWS PrivateLink) for KMS. Creating aVPC endpoint for KMS with private DNS enabled(Option C) causes standard KMS DNS names (for example, kms. < region > .
amazonaws.com) to resolve to theprivateendpoint IPs inside the VPC, routing requests over the AWS private network rather than through the internet. This is the core networking control that satisfies "no public service endpoints." To enforce that only calls that come through the intended VPC endpoint can use the key, add an authorization guardrail in theKMS key policyusing the aws:sourceVpce condition (Option A). This ensures that even if a principal has credentials, KMS will deny usage unless the request is made via the specified VPC endpoint, preventing accidental or malicious use over public paths.
Option B is neither necessary nor sufficient: removing an internet gateway does not prevent all public endpoint use (NAT, other egress paths, or other VPCs could still be involved) and can break workloads.
Option D is unrelated to runtime KMS API traffic. Option E is weaker because SourceIp checks can be bypassed via other AWS network paths and does not guarantee PrivateLink usage the way sourceVpce does.

NEW QUESTION # 128
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?

A. Log in to the suspicious instance and use the netstat command to identify remote connections.
Use the IP addresses from these remote connections to create deny rules in the security group of the instance. Install diagnostic tools on the instance for investigation. Update the outbound network ACL for the subnet in us-east-1b to explicitly deny all connections as the first rule during the investigation of the instance.
B. Update the outbound network ACL for the subnet in us-east-1b to explicitly deny all connections as the first rule. Replace the security group with a new security group that allows connections only from a diagnostics security group. Update the outbound network ACL for the us-east-1b subnet to remove the deny all rule. Launch a new EC2 instance that has diagnostic tools. Assign the new security group to the new EC2 instance. Use the new EC2 instance to investigate the suspicious instance.
C. Create an AWS WAF web ACL that denies traffic to and from the suspicious instance. Attach the AWS WAF web ACL to the instance to mitigate the attack. Log in to the instance and install diagnostic tools to investigate the instance.
D. Ensure that the Amazon Elastic Block Store (Amazon EBS) volumes that are attached to the suspicious EC2 instance will not delete upon termination. Terminate the instance. Launch a new EC2 instance in us-east-1a that has diagnostic tools. Mount the EBS volumes from the terminated instance for investigation.

Answer: D

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.

NEW QUESTION # 129
A company has a new web-based account management system for an online game. Players create a unique username and password to log in to the system.
The company has implemented an AWS WAF web ACL for the system. The web ACL includes the core rule set (CRS) AWS managed rule group on the Application Load Balancer that serves the system.
The company's security team finds that the system was the target of a credential stuffing attack.
Credentials that were exposed in other breaches were used to try to log in to the system.
The security team must implement a solution to reduce the chance of a successful credential stuffing attack in the future. The solution also must minimize impact on legitimate users of the system.
Which combination of actions will meet these requirements? (Choose two.)

A. Create a custom block response that redirects users to a secure workflow to reset their password inside the system.
B. Configure a default web ACL action that requires all users to solve a CAPTCHA puzzle when they log in.
C. Add the account takeover prevention (ATP) AWS managed rule group to the web ACL.
Configure the rule group to inspect login requests to the system. Block any requests that have the awswaf:managed:aws:atp:signal:credential_compromised label.
D. Create an Amazon CloudWatch custom metric to analyze the number of successful login responses from a single IP address.
E. Implement IP-based match rules in the web ACL for any IP addresses that generate many successful login responses. Block any IP addresses that generate many successful logins.

Answer: C,D

Explanation:
Creating a CloudWatch custom metric to monitor the number of successful login responses from a single IP address can help identify unusual patterns that might indicate credential stuffing. This allows for additional monitoring and detection without immediately impacting legitimate users. The AWS WAF Account Takeover Prevention (ATP) rule group is specifically designed to detect and mitigate credential stuffing attacks. By configuring ATP to inspect login requests and blocking requests with the awswaf:managed:aws:atp:signal:credential_compromised label, the security team can significantly reduce the chances of successful credential stuffing attacks. This approach targets compromised credentials while minimizing impact on legitimate users.

NEW QUESTION # 130
A company is implementing new compliance requirements to meet customer needs. According to the new requirements, the company must not use any Amazon RDS DB instances or DB clusters that lack encryption of the underlying storage. The company needs a solution that will generate an email alert when an unencrypted DB instance or DB cluster is created. The solution also must terminate the unencrypted DB instance or DB cluster.
Which solution will meet these requirements in the MOST operationally efficient manner?

A. Create an AWS Config managed rule to detect unencrypted RDS storage. Configure a manual remediation action to invoke an AWS Lambda function. Configure the Lambda function to publish messages to an Amazon Simple Notification Service (Amazon SNS) topic and to delete the unencrypted resource.
B. Create an AWS Config managed rule to detect unencrypted RDS storage. Configure an automatic remediation action to publish messages to an Amazon Simple Notification Service (Amazon SNS) topic that includes an AWS Lambda function and an email delivery target as subscribers. Configure the Lambda function to delete the unencrypted resource.
C. Create an Amazon EventBridge rule that evaluates RDS event patterns and is initiated by the creation of DB instances or DB clusters. Configure the rule to publish messages to an Amazon Simple Notification Service (Amazon SNS) topic that includes an AWS Lambda function and an email delivery target as subscribers. Configure the Lambda function to delete the unencrypted resource.
D. Create an Amazon EventBridge rule that evaluates RDS event patterns and is initiated by the creation of DB instances or DB clusters. Configure the rule to invoke an AWS Lambda function. Configure the Lambda function to publish messages to an Amazon Simple Notification Service (Amazon SNS) topic and to delete the unencrypted resource.

Answer: B

Explanation:
AWS Config provides managed rules that continuously evaluate resource configurations against compliance requirements. The AWS Certified Security - Specialty documentation highlights AWS Config managed rules as the preferred mechanism for enforcing configuration compliance at scale. The managed rule for encrypted RDS storage automatically detects DB instances and clusters that are created without encryption enabled.
By configuring automatic remediation, AWS Config can immediately invoke corrective actions without manual intervention. Integrating remediation with an Amazon SNS topic enables automated email notifications, while an AWS Lambda function can terminate the noncompliant resource. This creates a fully automated detect-alert-remediate workflow.
Option B requires manual remediation, which increases operational effort and delays enforcement. Options C and D rely on Amazon EventBridge, which evaluates events rather than configuration state and does not provide continuous compliance monitoring. AWS Config is explicitly designed for configuration compliance and governance use cases.
This solution aligns with AWS governance best practices by combining continuous monitoring, automated remediation, and centralized alerting with minimal operational overhead.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
AWS Config Managed Rules
AWS Config Automatic Remediation

NEW QUESTION # 131
A company runs a web application on a fleet of Amazon EC2 instances that are in an Auto Scaling group. The EC2 instances are in the same VPC subnet as other workloads.
A security engineer deploys an Amazon GuardDuty detector in the same AWS Region as the EC2 instances and integrates GuardDuty with AWS Security Hub.
The security engineer needs to implement an automated solution to detect and appropriately respond to anomalous traffic patterns for the web application. The solution must comply with AWS best practices for initial response to security incidents and must minimize disruption to the web application.
Which solution will meet these requirements?

A. Disable the EC2 instance profile credentials by using AWS Lambda.
B. Send GuardDuty findings to Amazon SNS for email notification.
C. Update the subnet network ACL to block traffic from the detected source IP addresses.
D. Create an Amazon EventBridge rule that invokes an AWS Lambda function when GuardDuty detects anomalous traffic. Configure the function to remove the affected instance from the Auto Scaling group and attach a restricted security group.

Answer: D

Explanation:
AWS incident response best practices emphasize rapid containment with minimal blast radius.
According to the AWS Certified Security - Specialty Official Study Guide, isolating a compromised resource while allowing the application to continue running is the preferred initial response.
By using Amazon EventBridge to detect GuardDuty findings related to anomalous traffic and invoking a Lambda function, the security engineer can automatically remove the affected EC2 instance from the Auto Scaling group and attach a restricted security group. This immediately isolates the instance while allowing Auto Scaling to launch a replacement instance, ensuring application availability.

NEW QUESTION # 132
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