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質問 # 169
A company uses AWS Organizations. The company subscribes to AWS Shield Advanced. The company must share third-party firewall logs from all its accounts with the Shield Response Team. The company stores the logs in an Amazon S3 bucket that uses server-side encryption with S3 managed keys (SSE-S3).
Which combination of steps will meet these requirements? (Choose Two.)
正解：A、B
解説：
To let the Shield Response Team assist during DDoS events, the account must explicitly authorize SRT access. The associate-drt-log-bucket operation authorizes SRT access to an S3 bucket that contains log data, including third-party source logs. The SRT also needs an IAM role with the AWSShieldDRTAccessPolicy policy and a trust relationship for the Shield DRT service principal so it can inspect relevant protection and logging information during mitigation. Delegated administration and auto-enable can help manage Shield Advanced across accounts, but they do not by themselves share the specific third-party firewall log bucket with SRT. Security Hub CSPM is unrelated to SRT log-bucket access.
質問 # 170
A company runs a global ecommerce website that is hosted on AWS. The company uses Amazon CloudFront to serve content to its user base. The company wants to block inbound traffic from a specific set of countries to comply with recent data regulation policies.
Which solution will meet these requirements MOST cost-effectively?
正解：B
解説：
Amazon CloudFront includes a native geo restriction (geoblocking) capability that allows content owners to control access to their distributions based on the geographic location of the viewer. The viewer's country is determined using the IP address from which the request originates. According to the AWS Certified Security
- Specialty Official Study Guide and the Amazon CloudFront Developer Guide, geo restriction is specifically designed for scenarios where organizations must comply with regional regulations, licensing requirements, or data sovereignty policies.
From a cost perspective, CloudFront geo restriction is the most cost-effective solution because it is configured directly within the CloudFront distribution and does not require AWS WAF. AWS WAF introduces additional costs for web ACLs, rules, and request processing, which is unnecessary when the requirement is limited strictly to blocking or allowing access based on country.
Option A is incorrect because maintaining IP ranges for entire countries is operationally complex, error-prone, and not scalable. Country-level IP ranges frequently change, making this approach unsuitable and inefficient.
Option B, although technically valid, is not the most cost-effective choice because AWS WAF geo match rules incur additional charges and are intended for advanced Layer 7 security controls such as application- layer attacks. Option D is incorrect because geolocation headers provided by CloudFront are informational only and cannot independently enforce access control decisions.
AWS documentation explicitly recommends CloudFront geo restriction when the sole requirement is country- based access control, reserving AWS WAF for advanced security inspection and threat mitigation use cases.
AWS Certified Security - Specialty Official Study Guide
Amazon CloudFront Developer Guide - Geo Restriction
AWS Well-Architected Framework - Security Pillar
AWS Security Best Practices Documentation
質問 # 171
A security engineer needs to prepare a company's Amazon EC2 instances for quarantine during a security incident. The AWS Systems Manager Agent (SSM Agent) has been deployed to all EC2 instances. The security engineer has developed a script to install and update forensics tools on the EC2 instances. Which solution will quarantine EC2 instances during a security incident?
正解：C
解説：
AWS Systems Manager Run Command enables security engineers to remotely and securely execute scripts on EC2 instances without requiring SSH or inbound network access. According to AWS Certified Security - Specialty incident response guidance, Run Command is a foundational tool for instance quarantine and forensic preparation.
By configuring IAM permissions that allow the SSM Agent to execute a predefined Run Command document, the security engineer can rapidly deploy forensic tools, disable services, or modify system configurations across affected EC2 instances during an incident. This approach aligns with AWS best practices for containment and evidence preservation, while maintaining auditability through Systems Manager logs.
質問 # 172
A company runs an internet-accessible application on several Amazon EC2 instances that run Windows Server. The company used an instance profile to configure the EC2 instances. A security team currently accesses the VPC that hosts the EC2 instances by using an AWS Site-to-Site VPN tunnel from an on-premises office.
The security team issues a policy that requires all external access to the VPC to be blocked in the event of a security incident. However, during an incident, the security team must be able to access the EC2 instances to obtain forensic information on the instances.
Which solution will meet these requirements?
正解：D
解説：
EC2 Instance Connect endpoints provide secure, private connectivity to EC2 instances without requiring public IP addresses, inbound internet access, or VPN connectivity. According to AWS Certified Security - Specialty documentation, Instance Connect endpoints are designed specifically for incident response and secure administrative access scenarios.
By deploying an EC2 Instance Connect endpoint in the VPC, the security team can block all external network access while still maintaining controlled access to EC2 instances through the AWS Management Console.
The endpoint uses AWS-managed infrastructure and private connectivity, and access is authorized using IAM policies and instance profiles.
Options A and B rely on direct EC2 Instance Connect installation and network paths that may still depend on external access. Option C is incorrect because tunneling is not required when using the console-based Instance Connect endpoint.
This solution enables forensic access during incidents without reopening external network paths, aligning with AWS incident response best practices.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
EC2 Instance Connect Endpoint Architecture
AWS Incident Response Best Practices
質問 # 173
A company has installed a third-party application that is distributed on several Amazon EC2 instances and on-premises servers. Occasionally, the company's IT team needs to use SSH to connect to each machine to perform software maintenance tasks. Outside these time slots, the machines must be completely isolated from the rest of the network. The company does not want to maintain any SSH keys. Additionally, the company wants to pay only for machine hours when there is an SSH connection.
Which solution will meet these requirements?
正解：C
解説：
AWS Systems ManagerSession Managerprovides interactive shell access to managed instanceswithout inbound SSH,without bastion hosts, andwithout managing SSH keys. Access is controlled through IAM policies, and every session can be logged to CloudWatch Logs/S3 for auditability. This directly satisfies the "no SSH keys" requirement and reduces the network exposure surface because you can keep port 22 closed and still obtain shell access when needed.
To meet the isolation requirement, the instances can be placed in private subnets with no inbound access, and you can use Systems Manager connectivity (via SSM endpoints/agents) for administrative sessions only when required. On-premises servers can also be managed by Systems Manager by registering them as managed instances (hybrid activations), allowing the same no-SSH-key operational model across EC2 and on-prem environments.
質問 # 174
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