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Amazon AWS Certified Security - Specialty 認定 SCS-C03 試験問題 (Q188-Q193):

質問 # 188
A security engineer needs to prepare Amazon EC2 instances for quarantine during a security incident. AWS Systems Manager Agent (SSM Agent) is installed, and a script exists to install and update forensic tools. Which solution will quarantine EC2 instances during a security incident?

A. Configure Session Manager to deny external connections.
B. Configure IAM permissions for the SSM Agent to run the script as a Systems Manager Run Command document.
C. Store the script in Amazon S3 and grant read access.
D. Track SSM Agent versions with AWS Config.

正解：B

解説：
AWS Systems Manager Run Command enables secure, remote execution of commands on EC2 instances without requiring network access or inbound ports. According to the AWS Certified Security - Specialty Study Guide, Run Command is a recommended mechanism for incident response actions such as installing forensic tools, collecting evidence, or applying quarantine controls.
By granting the SSM Agent permission to execute a predefined Run Command document, the security engineer can immediately run the quarantine script across affected instances. This approach supports automation, scalability, and auditability, all of which are critical during security incidents.
Options A, B, and C do not directly enforce quarantine or execute response actions. Tracking versions and storing scripts alone do not trigger incident response.
AWS documentation highlights Systems Manager Run Command as a core capability for automated containment and investigation.

質問 # 189
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?

A. Add deny rules to the ALB security group that prohibit incoming requests from the IP addresses.
B. Use AWS WAF to implement a rate-based rule for all incoming requests.
C. Edit the ALB security group to include a geographical match rule to block all incoming traffic from the two countries.
D. Use AWS WAF to implement a geographical match rule to block all incoming traffic from the two countries.

正解：B

解説：
AWS WAF rate-based rules are 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 from hundreds of IP addresses across two countries, mixed with legitimate user traffic. A rate-based rule allows the security engineer to limit excessive request rates without fully blocking access from entire geographic regions, ensuring that legitimate users can still access the application.

質問 # 190
A company needs centralized log monitoring with automatic detection across hundreds of AWS accounts. Which solution meets these requirements with the LEAST operational effort?

A. Centralize CloudTrail logs and query with Athena.
B. Stream logs to Kinesis and process with Lambda.
C. Centralize CloudWatch logs and use Inspector.
D. Designate a GuardDuty administrator account and enable protections.

正解：D

解説：
Amazon GuardDuty provides fully managed threat detection across accounts when configured with delegated administration. EKS and RDS protections enable workload-aware detection with minimal setup.
Other solutions require custom pipelines and higher operational overhead.

質問 # 191
A company is using AWS WAF to protect a customized public API service that is based on Amazon EC2 instances. The API uses an Application Load Balancer. The AWS WAF web ACL is configured with an AWS Managed Rules rule group. After a software upgrade to the API and the client application, some types of requests are no longer working and are causing application stability issues. A security engineer discovers that AWS WAF logging is not turned on for the web ACL.
The security engineer needs to immediately return the application to service, resolve the issue, and ensure that logging is not turned off in the future. The security engineer turns on logging for the web ACL and specifies Amazon CloudWatch Logs as the destination.
Which additional set of steps should the security engineer take to meet the requirements?

A. Edit the rules in the web ACL to include rules with Count and Challenge actions. Review the logs to determine which rule is blocking the request. Modify the AWS WAF resource policy so that AWS WAF administrators cannot remove the logging configuration for any AWS WAF web ACLs.
B. Edit the rules in the web ACL to include rules with Count and Challenge actions. Review the logs to determine which rule is blocking the request. Modify the IAM policy of all AWS WAF administrators so that they cannot remove the logging configuration for any AWS WAF web ACLs.
C. Edit the rules in the web ACL to include rules with Count actions. Review the logs to determine which rule is blocking the request. Modify the IAM policy of all AWS WAF administrators so that they cannot remove the logging configuration for any AWS WAF web ACLs.
D. Edit the rules in the web ACL to include rules with Count actions. Review the logs to determine which rule is blocking the request. Modify the AWS WAF resource policy so that AWS WAF administrators cannot remove the logging configuration for any AWS WAF web ACLs.

正解：C

解説：
Comprehensive and Detailed 100to 150 words of Explanation From AWS Certified Security - Specialty topics:
For a suspected AWS Managed Rules false positive, the immediate safe response is to override affected rules to Count. Count is non-terminating, so AWS WAF records the match but does not block the request, helping restore application availability while preserving evidence in logs. After reviewing CloudWatch Logs, the engineer can identify the specific managed rule causing the block and tune the web ACL. To prevent logging from being turned off again, access must be controlled through IAM by denying actions such as DeleteLoggingConfiguration. AWS WAF resource policies are for rule group sharing and similar resource- level permissions, not the correct mechanism to stop administrators from disabling web ACL logging.
Challenge is unnecessary and can still affect client behavior.

質問 # 192
A company is using AWS to run a long-running analysis process on data that is stored in Amazon S3 buckets.
The process runs on a fleet of Amazon EC2 instances in an Auto Scaling group. The EC2 instances are deployed in a private subnet that does not have internet access.
The EC2 instances access Amazon S3 through an S3 gateway endpoint that has the default access policy.
Each EC2 instance uses an instance profile role that allows s3:GetObject and s3:PutObject only for required S3 buckets.
The company learns that one or more EC2 instances are compromised and are exfiltrating data to an S3 bucket that isoutside the company's AWS Organization. The processing job must continue to function.
Which solution will meet these requirements?

A. Update the policy on the S3 gateway endpoint to allow S3 actions only if aws:ResourceOrgId and aws:
PrincipalOrgId match the company's organization.
B. Add a network ACL rule to block outbound traffic on port 443.
C. Apply an SCP that restricts S3 actions using organization condition keys.
D. Update the instance profile role policy to require aws:ResourceOrgId.

正解：A

解説：
Amazon S3 gateway endpoints supportendpoint policiesthat can restrict which S3 resources are accessible through the endpoint. According to AWS Certified Security - Specialty documentation, endpoint policies are evaluatedin addition to IAM policiesand are ideal for enforcingdata exfiltration controlswithout breaking legitimate workloads.
By updating the S3 gateway endpoint policy to require both aws:ResourceOrgId and aws:PrincipalOrgId to match the company's AWS Organization, the security engineer ensures that EC2 instances can accessonly S3 buckets that belong to the organization. This immediately blocks exfiltration to external S3 buckets while allowing legitimate internal data access to continue uninterrupted.
Option B is insufficient because IAM policies alone cannot prevent access when the endpoint allows it.
Option C would break all S3 access and stop the processing job. Option D applies too broadly and can impact unrelated services across the account.
AWS documentation highlightsS3 VPC endpoint policies with organization condition keysas a best practice for preventing S3 data exfiltration in private VPC environments.
* AWS Certified Security - Specialty Official Study Guide
* Amazon S3 VPC Endpoint Policy Documentation
* AWS Organizations Condition Keys Documentation

質問 # 193
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