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질문 # 27
A security administrator is setting up a new AWS account. The security administrator wants to secure the data that a company stores in an Amazon S3 bucket. The security administrator also wants to reduce the chance of unintended data exposure and the potential for misconfiguration of objects that are in the S3 bucket.
Which solution will meet these requirements with the LEAST operational overhead?
정답：D
설명：
Amazon S3 Block Public Access configured at the AWS account level is the recommended and most effective approach to protect data stored in Amazon S3 while minimizing operational overhead. AWS Security Specialty documentation explains that S3 Block Public Access provides centralized, preventative controls designed to block public access to S3 buckets and objects regardless of individual bucket policies or object- level ACL configurations. When enabled at the account level, these controls automatically apply to all existing and newly created buckets, significantly reducing the risk of accidental exposure caused by misconfigured permissions.
The AWS Certified Security - Specialty Study Guide emphasizes that public access misconfiguration is a leading cause of data leaks in cloud environments. Account-level S3 Block Public Access acts as a guardrail by overriding any attempt to grant public permissions through bucket policies or ACLs. This eliminates the need to manage security settings on a per-bucket or per-object basis, thereby reducing administrative complexity and human error.
Configuring Block Public Access at the object level, as in option B, requires continuous monitoring and manual configuration, which increases operational overhead. Disabling ACLs alone, as described in option C, does not fully prevent public access because bucket policies can still allow public permissions. Using AWS PrivateLink, as in option D, controls network access but does not protect against public exposure through misconfigured S3 policies.
AWS security best practices explicitly recommend enabling S3 Block Public Access at the account level as the primary mechanism for preventing unintended public data exposure with minimal management effort.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
Amazon S3 Security Best Practices Documentation
Amazon S3 Block Public Access Overview
AWS Well-Architected Framework - Security Pillar
질문 # 28
A company requires a specific software application to be installed on all new and existing Amazon EC2 instances across an AWS Organization. SSM Agent is installed and active. How can the company continuously monitor deployment status of the software application?
정답：D
설명：
Continuous monitoring requires an always-on compliance service that evaluates resources over time. AWS Config provides managed rules that assess configuration state and compliance continuously. AWS Certified Security - Specialty guidance highlights AWS Config for continuous compliance across accounts and regions when used with AWS Organizations. The ec2- managedinstance-applications- required managed rule evaluates whether specified software is installed on managed instances, leveraging Systems Manager inventory/managed instance status. By enabling AWS Config organization-wide and deploying this managed rule across all accounts, the company can continuously evaluate both existing and newly launched instances for required application presence. This provides a consistent compliance dashboard and history of compliance changes. Option D can provide inventory lists, but it is not a compliance rule engine that flags noncompliance with the same governance reporting and remediation pathways. Options B and C are operational approaches but do not provide continuous compliance state across the organization.
질문 # 29
A security engineer must investigate an Amazon GuardDuty finding. The finding indicates potential cryptocurrency mining activity on an Amazon EC2 instance. The security engineer must validate the finding and assess the impact.
Which data sources should the security engineer analyze to meet these requirements?
정답：D
설명：
Comprehensive and Detailed 100to 150 words of Explanation From AWS Certified Security - Specialty topics:
Cryptocurrency mining validation requires evidence of actual mining behavior, not only metadata about the finding. Process details show whether mining binaries or suspicious processes are running on the instance.
DNS analysis can reveal lookups to known mining pools or suspicious domains. VPC Flow Logs help confirm outbound connections, destinations, ports, and traffic volume from the instance. GuardDuty uses foundational data sources such as DNS logs, VPC Flow Logs, and CloudTrail events to detect suspicious activity, so those same sources are appropriate for validating and scoping the finding. CPU metrics alone are useful context but not enough. Counting findings or checking severity does not prove impact. Session history and Route 53 records do not directly validate mining behavior.
질문 # 30
A company experienced a security incident caused by a vulnerable container image that was pushed from an external CI/CD pipeline into Amazon ECR.
Which solution will prevent vulnerable images from being pushed?
정답：D
설명：
Amazon Inspector provides native CI/CD integration capabilities that allow security checks to occur before container images are pushed to Amazon ECR. According to AWS Certified Security - Specialty documentation, Inspector does not block image pushes automatically. Instead, prevention must occur inside the CI/CD pipeline itself.
By generating a Software Bill of Materials (SBOM) using the Amazon Inspector SBOM generator and submitting it to Inspector for scanning, the pipeline can detect critical vulnerabilities before the image is uploaded. If vulnerabilities exceed policy thresholds, the pipeline fails, preventing deployment.
Post-push scanning solutions only detect vulnerabilities after exposure. Event-driven blocking does not prevent the initial risk.
AWS best practices require "shift-left" security controls to prevent vulnerable artifacts from entering production.
Referenced AWS Specialty Documents:
AWS Certified Security - Specialty Official Study Guide
Amazon Inspector CI/CD Integration
질문 # 31
A company allows users to download its mobile app onto their phones. The app is MQTT based and connects to AWS IoT Core to subscribe to specific client-related topics. Recently, the company discovered that some malicious attackers have been trying to get a Trojan horse onto legitimate mobile phones. The Trojan horse poses as the authentic application and uses a client ID with injected special characters to gain access to topics outside the client ' s privilege scope.
Which combination of actions should the company take to prevent this threat? (Select TWO.)
정답：B,E
설명：
The threat is client ID manipulation to break authorization boundaries. The strongest control is tobind the MQTT client identity to the authenticated device identity(the Thing) rather than trusting arbitrary client IDs provided by the client. Using theThing name as the client ID(Option A) removes ambiguity and makes the identifier predictable and tied to a registered identity.
On the authorization side, AWS IoT Core policies can use policy variables. Allowing iot:Connect only when the resource matches client/${iot:Connection.Thing.ThingName} (Option E) ensures the connection is permittedonlyif the client ID exactly equals the authenticated Thing name from the TLS certificate/Thing principal context. This prevents attackers from injecting special characters or choosing a different client ID to escalate access, because the policy evaluation ties the allowed client resource to the Thing identity, not the attacker-controlled string.
Option D is weaker because it effectively allows whatever client ID is presented (it matches the same value the client supplies), so it does not prevent crafted client IDs from being used. Option C is unrelated to the described MQTT connect authorization (and references an action not aligned with the scenario). Option B is an application-side check and can be bypassed by a malicious client; enforcement must be at AWS IoT Core policy level.
질문 # 32
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