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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	Incident Response: This domain addresses responding to security incidents through automated and manual strategies, containment, forensic analysis, and recovery procedures to minimize impact and restore operations.
Topic 4	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.
Topic 5	Data Protection: This domain centers on protecting data at rest and in transit through encryption, key management, data classification, secure storage, and backup mechanisms.

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Amazon AWS Certified Security - Specialty Sample Questions (Q85-Q90):

NEW QUESTION # 85
A company has an encrypted Amazon Aurora DB cluster in the us-east-1 Region. The DB cluster is encrypted with an AWS Key Management Service (AWS KMS) customer managed key. To meet compliance requirements, the company needs to copy a DB snapshot to the us-west-1 Region. However, when the company tries to copy the snapshot to us-west-1, the company cannot access the key that was used to encrypt the original database.
What should the company do to set up the snapshot in us-west-1 with proper encryption?

A. Create an IAM policy that allows access to the customer managed key in us-east-1. Specify arn:aws:
kms:us-west-1:* as the principal.
B. Create a new customer managed key in us-west-1. Use this new key to encrypt the snapshot in us-west-
1.
C. Use AWS Secrets Manager to store the customer managed key in us-west-1 as a secret. Use this secret to encrypt the snapshot in us-west-1.
D. Create an IAM policy that allows access to the customer managed key in us-east-1. Specify arn:aws:rds:
us-west-1:* as the principal.

Answer: B

Explanation:
AWS Key Management Service (KMS) customer managed keys areregional resources. According to the AWS Certified Security - Specialty Official Study Guide and KMS documentation, a KMS key created in one AWS Regioncannot be used directly in another Region. When copying an encrypted Amazon Aurora DB snapshot across Regions, the destination Region must have access to a KMS keythat exists in that Region.
Because the original KMS key resides in us-east-1, it cannot be accessed or referenced in us-west-1. The correct and supported approach is tocreate a new customer managed KMS key in us-west-1and specify that key when performing the cross-Region snapshot copy. Amazon RDS automatically decrypts the snapshot using the source Region key and re-encrypts it using the destination Region key during the copy process.
Option A is invalid because KMS keys cannot be stored or transferred through AWS Secrets Manager.
Options C and D are incorrect because IAM policies cannot grant cross-Region usage of a KMS key; KMS enforces strict regional boundaries regardless of IAM permissions.
AWS documentation clearly states thatcross-Region encrypted snapshot copies require a KMS key in the destination Region, making this approach mandatory for compliance and encryption continuity.
* AWS Certified Security - Specialty Official Study Guide
* AWS Key Management Service Developer Guide
* Amazon Aurora Security Documentation

NEW QUESTION # 86
A company operates an Amazon EC2 instance that is registered as a target of a Network Load Balancer (NLB). The NLB is associated with a security group. The security group allows inbound TCP traffic on port
22 from 10.0.0.0/23.
The company maps the NLB to two subnets that share the same network ACL and route table. The route table has a route for 0.0.0.0/0 to an internet gateway. The network ACL has one inbound rule that has a priority of
20 and that allows TCP traffic on port 22 from 10.0.0.0/16.
A security engineer receives an alert that there is an unauthorized SSH session on the EC2 instance. The unauthorized session originates from 10.0.1.5. The company's incident response procedure requires unauthorized SSH sessions to beimmediately interrupted. The instance must remain running, and its memory must remain intact.
Which solution will meet these requirements?

A. Restart the EC2 instance from either the AWS Management Console or the AWS CLI.
B. Remove the security group rule that allows inbound TCP traffic on port 22 from 10.0.0.0/16.
C. Update the route table to remove the route to the internet gateway.
D. Add a new inbound rule that has a priority of 10 to the network ACL to deny TCP traffic on port 22 from 10.0.1.5.

Answer: D

Explanation:
Network ACLs arestatelessand are evaluated in order based on rule number, with lower rule numbers taking precedence. According to AWS Certified Security - Specialty incident response guidance, network ACLs can be used toimmediately block traffic at the subnet levelwithout restarting instances or modifying their runtime state.
By adding a deny rule with alower priority number (10)that explicitly denies TCP traffic on port 22 from the offending IP address (10.0.1.5), the unauthorized SSH session is immediately interrupted. This approach satisfies the requirement to keep the instance running and to preserve memory for forensic analysis.
Option A violates the requirement because restarting the instance clears memory. Option C would disrupt all legitimate SSH access, not just the unauthorized session. Option D would block all internet access and could cause widespread service disruption.
AWS documentation emphasizes usingnetwork ACL deny rules for rapid, targeted containmentwhen immediate interruption is required without altering instance state.
* AWS Certified Security - Specialty Official Study Guide
* Amazon VPC Network ACL Documentation
* AWS Incident Response Best Practices

NEW QUESTION # 87
CloudFormation stack deployments fail for some users due to permission inconsistencies. Which combination of steps will ensure consistent deployments MOST securely? (Select THREE.)

A. Attach scoped policies to the service role.
B. Update each stack to use the service role.
C. Create a composite principal service role.
D. Attach service ARNs in policy resources.
E. Create a service role with cloudformation.amazonaws.com as the principal.
F. Allow iam:PassRole to the service role.

Answer: B,E,F

Explanation:
AWS best practices require CloudFormation to assume a dedicated service role. This ensures consistent permissions regardless of the user. Users must have iam:PassRole permission to pass the role. Updating stacks to use the service role enforces uniform deployment behavior.

NEW QUESTION # 88
A company runs a web application on a fleet of Amazon EC2 instances in an Auto Scaling group.
Amazon GuardDuty and AWS Security Hub are enabled. The security engineer needs an automated response to anomalous traffic that follows AWS best practices and minimizes application disruption. Which solution will meet these requirements?

A. Send GuardDuty findings to Amazon SNS for email notification.
B. Use EventBridge to disable the instance profile access keys.
C. Use Security Hub to update the subnet network ACL to block traffic.
D. Use EventBridge to invoke a Lambda function that removes the affected instance from the Auto Scaling group and isolates it with a restricted security group.

Answer: D

Explanation:
AWS incident response best practices emphasize isolating compromised resources rather than immediately terminating them. According to AWS Certified Security - Specialty documentation, removing an instance from an Auto Scaling group prevents replacement loops, while applying a restrictive security group isolates the instance for forensic analysis.
Using Amazon EventBridge to trigger an AWS Lambda function enables automated, consistent responses to GuardDuty findings. This approach minimizes disruption to the application because healthy instances continue serving traffic while the affected instance is isolated.
Disabling credentials or modifying network ACLs can have broader impact on unrelated workloads. SNS notifications alone do not provide response automation.
AWS recommends isolate-and-investigate patterns for EC2 incident response.

NEW QUESTION # 89
A company hosts its public website on Amazon EC2 instances behind an Application Load Balancer (ALB). The website is experiencing a global DDoS attack from a specific IoT device brand that uses a unique user agent. A security engineer is creating an AWS WAF web ACL and will associate it with the ALB. Which rule statement will mitigate the current attack and future attacks from these IoT devices without blocking legitimate customers?

A. Use a rate-based rule statement.
B. Use an IP set match rule statement.
C. Use a geographic match rule statement.
D. Use a string match rule statement on the user agent.

Answer: D

Explanation:
AWS WAF string match rule statements allow inspection of HTTP headers, including the User- Agent header. According to AWS Certified Security - Specialty guidance, when malicious traffic can be uniquely identified by a consistent request attribute, such as a device-specific user agent, a string match rule provides precise mitigation with minimal false positives.
IP-based blocking is ineffective for globally distributed botnets. Geographic blocking risks denying access to legitimate users. Rate-based rules limit request volume but do not prevent low-and- slow attacks.
By matching the unique IoT device brand in the User-Agent header, the security engineer can block only malicious requests while preserving customer access.

NEW QUESTION # 90
......

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