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質問 # 118
A company is running a new workload across accounts in an organization in AWS Organizations.
All running resources must have a tag of CostCenter, 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?
正解：C
解説：
AWS Organizations tag policies are designed to standardize and govern tag keys and allowed values across accounts. AWS Certified Security - Specialty documentation describes tag policies as a governance mechanism that helps enforce consistent tagging by specifying required tag keys and permitted values. To ensure every resource has the CostCenter tag at creation time, an SCP can deny create actions when aws:RequestTag/CostCenter is missing (null). This prevents resources from being created without the required tag. Tag policies then define the three approved values and can be configured to enforce or report noncompliance depending on supported services, ensuring that tag values remain within the allowed set and preventing drift to unapproved values. Compared with custom Lambda-based enforcement, this approach minimizes operational overhead and keeps enforcement within AWS native governance services.
Option A partially addresses allowed values at request time but does not address ongoing governance as cleanly across many services. Option B is not preventive because Lambda runs after events and cannot reliably block all creations. Option D still relies on custom logic and is not as operationally efficient as tag policies plus SCP guardrails.
質問 # 119
A company has contracted with a third party to audit several AWS accounts. To enable the audit, cross-account IAM roles have been created in each account targeted for audit. The auditor is having trouble accessing some of the accounts.
Which of the following may be causing this problem? (Choose three.)
正解：B、D、E
解説：
Cross-account access for an external auditor typically usesSTS AssumeRoleinto a role that exists in each target account. Three common failure points are: (1) therole ARNbeing wrong or missing, (2) the auditor lacking permission to callsts:AssumeRoleon that role, and (3) anexternal IDmismatch when the role trust policy requires it. Theexternal IDis a best practice for third-party access to mitigate the confused-deputy problem; if the trust policy includes an sts:ExternalId condition, the auditor must supply the exact expected value. If it's absent or incorrect, AssumeRole will be denied.
The auditor must also be authorized on their side (IAM user/role policy) to call sts:AssumeRole (permission), and the destination role'strust policymust trust the auditor principal. If either side is misconfigured, the assume operation fails. Finally, the auditor must reference the correctrole ARNfor each account; using an incorrect ARN (wrong account ID/role name/path) is a frequent reason only "some accounts" fail.
質問 # 120
A company runs several applications on Amazon Elastic Kubernetes Service (Amazon EKS). The company needs a solution to detect any Kubernetes security risks by monitoring Amazon EKS audit logs in addition to operating system, networking, and file events. The solution must send email alerts for any identified risks to a mailing list that is associated with a security team.
Which solution will meet these requirements?
正解：A
解説：
Option C best meets the requirements because Amazon GuardDuty provides Kubernetes-focused threat detection for Amazon EKS by analyzingEKS control plane audit logs(EKS Protection) and combining that signal withruntime telemetryfrom the worker nodes (Runtime Monitoring). EKS audit logs capture Kubernetes API activity and authorization decisions, allowing GuardDuty to detect suspicious cluster actions such as unusual API calls, unexpected access patterns, or indicators of compromise within the cluster.
Runtime Monitoring extends coverage tooperating system/process activity, network connections, and file activityon the nodes, which directly aligns with the need to monitor OS, networking, and file events in addition to audit logs.
For notifications, GuardDuty generatesfindingsthat can be delivered throughAmazon EventBridgerules.
EventBridge can route relevant GuardDuty findings to anAmazon SNS topic, and SNS can sendemail alertsto the security team by subscribing the team's mailing list to the topic. This approach is fully managed, near real time, and avoids building custom log-parsing pipelines while still providing actionable alerts based on GuardDuty's curated EKS threat detections.
質問 # 121
A company is migrating one of its legacy systems from an on-premises data center to AWS. The application server will run on AWS, but the database must remain in the on-premises data center for compliance reasons.
The database is sensitive to network latency. Additionally, the data that travels between the on-premises data center and AWS must have IPsec encryption.
Which combination of AWS solutions will meet these requirements? (Select TWO.)
正解：B、E
解説：
The database islatency-sensitive, so the connectivity option should minimize jitter and provide more consistent performance than traversing the public internet.AWS Direct Connectprovides a dedicated network connection from the on-premises environment into AWS, typically delivering more stable throughput and lower/consistent latency characteristics compared with internet-based paths. However, Direct Connect by itself does not automatically provideIPsec encryption.
To satisfy the explicit requirement that traffic must haveIPsec encryption, the common AWS pattern is to run anAWS Site-to-Site VPN(IPsec tunnels) in conjunction with Direct Connect. This can be done as "VPN over Direct Connect" to encrypt the traffic while still taking advantage of Direct Connect's private, predictable connectivity. This combination meets both requirements: improved latency characteristics (Direct Connect) and IPsec encryption (Site-to-Site VPN).
The other options do not fit. VPN CloudHub (Option C) is for connecting multiple remote sites together via AWS as a hub-and-spoke, not a primary low-latency private link. VPC peering (Option D) is only for VPC-to- VPC connectivity and does not connect to on-premises. NAT gateway (Option E) is for outbound internet
/NAT translation and does not provide private encrypted connectivity to on-premises.
質問 # 122
A security engineer is responding to an incident that is affecting an AWS account. The ID of the account is
123456789012. The attack created workloads that are distributed across multiple AWS Regions.
The security engineer contains the attack and removes all compute and storage resources from all affected Regions. However, the attacker also created an AWS KMS key. The key policy on the KMS key explicitly allows IAM principal kms:* permissions.
The key was scheduled to be deleted the previous day. However, the key is still enabled and usable. The key has an ARN of arn:aws:kms:us-east-2:123456789012:key/mrk-0bb0212cd9864fdea0dcamzo26efb5670.
The security engineer must delete the key as quickly as possible.
Which solution will meet this requirement?
正解：A
解説：
AWS KMS enforces amandatory minimum waiting period of 7 daysbefore a customer managed key can be deleted. According to AWS Certified Security - Specialty incident response guidance,no method exists to immediately delete a KMS key. The fastest possible deletion is achieved by scheduling deletion with the minimum 7-day waiting period.
In this scenario, although deletion was previously scheduled, the key remains enabled and usable. The most authoritative and reliable method to regain control and reissue deletion immediately is touse the AWS account root user, which has implicit permissions to manage KMS keys regardless of compromised IAM principals.
Option B is incorrect because KMS keys are regional resources; multi-Region keys require coordinated deletion but do not shorten the waiting period. Option C is unnecessary because the key policy already allows kms:*. Option D increases the deletion waiting period to 30 days, which violates the requirement to delete the key as quickly as possible.
AWS documentation clearly states thatroot user access is the ultimate authority for KMS key management and that7 days is the minimum deletion window, making this the fastest valid option.
* AWS Certified Security - Specialty Official Study Guide
* AWS Key Management Service Developer Guide
* AWS Incident Response Best Practices
質問 # 123
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