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Amazon SCS-C03 Prüfungsplan:

Thema	Einzelheiten
Thema 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.
Thema 2	Security Foundations and Governance: This domain addresses foundational security practices including policies, compliance frameworks, risk management, security automation, and audit procedures for AWS environments.
Thema 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.

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Amazon AWS Certified Security - Specialty SCS-C03 Prüfungsfragen mit Lösungen (Q256-Q261):

256. Frage
A company has a web application that reads from and writes to an Amazon S3 bucket. The company needs to authenticate all S3 API calls with AWS credentials. Which solution will provide the application with AWS credentials?

A. Use Amazon Cognito identity pools and AssumeRoleWithWebIdentity.
B. Use Amazon Cognito user pools with access tokens.
C. Use Amazon Cognito identity pools and the GetId API.
D. Use Amazon Cognito user pools with ID tokens.

Antwort: A

Begründung:
Amazon Cognito identity pools provide temporary AWS credentials by exchanging web identity tokens with AWS STS using AssumeRoleWithWebIdentity. According to AWS Certified Security - Specialty documentation, this is the correct mechanism for granting applications AWS credentials.
User pools authenticate users but do not issue AWS credentials. Identity pools integrate with IAM roles and STS, enabling secure, temporary access to AWS services.

257. Frage
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. Update the subnet network ACL to block traffic from the detected source IP addresses.
C. 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.
D. Send GuardDuty findings to Amazon SNS for email notification.

Antwort: C

Begründung:
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.

258. Frage
A company is running a new workload across accounts that are in an organization in AWS Organizations. All running resources must have a tag ofCostCenter, and the tag must have one of three approved values. The company must enforce this policy and must prevent any changes of the CostCenter tag to a non-approved value.
Which solution will meet these requirements?

A. Enable tag policies for the organization. Create a tag policy that specifies a tag key of CostCenter and the approved values. Configure the policy to enforce noncompliant operations. Create an SCP that denies the creation of resources when the aws:RequestTag/CostCenter condition key has a null value.
B. Create an AWS CloudTrail trail. Create an Amazon EventBridge rule that includes a rule statement that matches the creation of new resources. Configure the EventBridge rule to invoke an AWS Lambda function that checks for the CostCenter tag. Program the Lambda function to block creation in case of a noncompliant value.
C. Create an AWS Config Custom Policy rule by using AWS CloudFormation Guard. Include the tag key of CostCenter and the approved values. Create an SCP that denies the creation of resources when the value of the aws:RequestTag/CostCenter condition key is not one of the three approved values.
D. Enable tag policies for the organization. Create a tag policy that specifies a tag key of CostCenter and the approved values. Create an Amazon EventBridge rule that invokes an AWS Lambda function when a noncompliant tag is created. Program the Lambda function to block changes to the tag.

Antwort: C

Begründung:
Toenforcerequired tagging and approved values at scale, the strongest guardrail is anSCPbecause SCPs can prevent API calls across accounts/OUs before resources are created or tags are changed. By using the aws:
RequestTag/CostCenter condition key and checking that the value is one of the approved values, an SCP candeny Create (and TagResource/UntagResource where supported)* when the request attempts to set a non- approved value. This prevents "bad" CostCenter values from being introduced.
AWS Config (including custom policy rules with CloudFormation Guard) is excellent fordetectingnoncompliance and reporting, but on its own it is not a hard preventative control. Pairing Config rule evaluation with an SCP guardrail gives both visibility and prevention. Option A is the only option that explicitly combines an enforceable preventive control (SCP deny based on aws:RequestTag/CostCenter) with compliance evaluation logic.
Option B cannot "block creation" reliably because EventBridge/Lambda isafter-the-fact; by the time the function runs, the resource is already created. Option C relies on tag policies enforcement semantics; tag policies primarilystandardize and reporttag usage, and the provided SCP in C only checks for null/missing values, not for non-approved values or for preventing later changes. Option D is also reactive and not a guaranteed preventative control.

259. Frage
A company is running an application in the eu-west-1 Region. The application uses an AWS Key Management Service (AWS KMS) customer managed key to encrypt sensitive data. The company plans to deploy the application in the eu-north-1 Region. A security engineer needs to implement a key management solution for the application deployment in the new Region. The security engineer must minimize changes to the application code. Which change should the security engineer make to the AWS KMS configuration to meet these requirements?

A. Allocate a new customer managed key to eu-north-1. Create an alias for eu--1. Change the application code to point to the alias for eu--1.
B. Allocate a new customer managed key to eu-north-1 to be used by the application that is deployed in that Region.
C. Allocate a new customer managed key to eu-north-1. Create the same alias name for both keys.
Configure the application deployment to use the key alias.
D. Update the key policies in eu-west-1. Point the application in eu-north-1 to use the same customer managed key as the application in eu-west-1.

Antwort: C

Begründung:
AWS KMS keys are regional resources and cannot be used across Regions. According to AWS Certified Security - Specialty documentation, applications that are deployed in multiple Regions should use region-specific customer managed keys while referencing keys by alias instead of key ID.
By creating a new customer managed key in eu-north-1 and assigning it the same alias as the key in eu-west-1, the application code can continue to reference the alias without modification.
Each Region resolves the alias to the correct local key, ensuring encryption continues to function correctly.
Option A is invalid because KMS keys are regional. Option B requires application changes.
Option D introduces unsupported alias patterns.
AWS best practices recommend alias-based key references for multi-Region deployments.

260. Frage
A security engineer is designing security controls for a fleet of Amazon EC2 instances that run sensitive workloads in a VPC. The security engineer needs to implement a solution to detect and mitigate software vulnerabilities on the EC2 instances.
Which solution will meet this requirement?

A. Install the Amazon CloudWatch agent on the EC2 instances. Enable detailed logging. Use Amazon EventBridge to review the software logs for anomalies.
B. Scan the EC2 instances by using Amazon GuardDuty Malware Protection. Apply security patches and updates by using AWS Systems Manager Patch Manager.
C. Install host-based firewall and antivirus software on each EC2 instance. Use AWS Systems Manager Run Command to update the firewall and antivirus software.
D. Scan the EC2 instances by using Amazon Inspector. Apply security patches and updates by using AWS Systems Manager Patch Manager.

Antwort: D

Begründung:
To addresssoftware vulnerabilities, you need both (1) a vulnerability assessment capability and (2) a consistent patching mechanism.Amazon Inspectorcontinuously scans EC2 instances for known software vulnerabilities and exposures (CVEs), package-level issues, and security misconfigurations relevant to the supported scan types. It provides prioritized findings and helps the security team understand which instances are exposed and why.
To mitigate those vulnerabilities,AWS Systems Manager Patch Managerprovides automated, policy-driven patching for fleets of EC2 instances. Patch Manager can schedule patch windows, control reboots, enforce baselines, and report compliance, allowing the company to remediate issues at scale with controlled operational impact.
Option B focuses on firewall/AV tooling, which can be helpful, but it is not a complete vulnerability detection- and-patching solution and is heavier to manage across large fleets. Option C is centered on log anomaly detection, not vulnerability management. Option D mixes GuardDuty Malware Protection (malware detection) with patching; GuardDuty is not a vulnerability scanner and does not replace Inspector for CVE detection. Therefore, Inspector + Patch Manager is the correct combined solution to detect and mitigate software vulnerabilities.

261. Frage
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