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質問 # 301
A company uses default settings to create an AWS Lambda function. The function needs to access an Amazon RDS database that is in a private subnet of a VPC. The function has the correct IAM permissions to access the database. The private subnet has appropriate routing configurations and is accessible from within the VPC. However, the Lambda function is unable to connect to the RDS instance.
What is the likely reason the Lambda function cannot connect to the RDS instance?
正解：C
解説：
By default, a newly created AWS Lambda function is not attached to a customer VPC. In its default configuration, Lambda runs in an AWS-managed network environment and can reach public internet endpoints, but it does not automatically have network-level connectivity into private subnets within a VPC. Accessing an Amazon RDS instance that is placed in a private subnet requires the Lambda function to be configured for VPC access. This means selecting the target VPC, choosing subnets (typically private subnets with appropriate routing), and associating one or more security groups with the Lambda function's elastic network interfaces (ENIs). Once configured, Lambda creates ENIs in the selected subnets and uses them to communicate with resources such as RDS inside the VPC.
In this scenario, the RDS database is in a private subnet and is reachable from within the VPC, but the Lambda function cannot connect. The most likely cause is that the function was created with default settings and therefore was not deployed into the VPC that contains the database.
IAM permissions are not sufficient for network connectivity; IAM controls authorization to call AWS APIs, while VPC attachment and security groups control the network path.
質問 # 302
A company needs to deploy instances of an application and associated infrastructure to multiple AWS Regions. The company wants to use a single AWS CloudFormation template to achieve this goal. The company uses AWS Organizations and wants to administer and run this template from a central administration account. What should a CloudOps engineer do to meet these requirements?
正解：D
解説：
AWS CloudFormation StackSets are designed specifically for deploying a single CloudFormation template across multiple AWS accounts and multiple AWS Regions. With service-managed permissions, StackSets integrate with AWS Organizations so the administrator does not need to manually create IAM roles in every target account. AWS documentation states that service- managed StackSets can deploy stacks to accounts managed by AWS Organizations in specific Regions and that CloudFormation creates the required IAM roles on your behalf. This directly satisfies central administration, multi-account deployment, and multi-Region deployment. Options A, B, and C add unnecessary complexity and do not provide native organization-wide lifecycle management. Nested stacks are useful for modular templates, not centralized deployment across many accounts and Regions. Therefore, StackSets with service-managed permissions is the correct CloudOps automation approach.
質問 # 303
A CloudOps engineer has successfully deployed a VPC with an AWS CloudFormation template. The CloudOps engineer wants to deploy the same template across multiple accounts that are managed through AWS Organizations.
Which solution will meet this requirement with the LEAST operational overhead?
正解：B
解説：
CloudFormation StackSets are designed specifically to deploy and manage the same CloudFormation stack across multiple AWS accounts and Regions from a centralized administration point. When accounts are managed under AWS Organizations, StackSets can integrate directly with Organizations to target Organizational Units (OUs) or specific accounts, which minimizes operational overhead. This removes the need to manually assume roles and deploy stacks one-by-one, and avoids building custom automation (Lambda + cross-account role assumption + account enumeration + error handling + retries + idempotency).
With StackSets, you define the template once and then create stack instances across many accounts in a controlled and consistent manner. StackSets provide built-in features for: (1) centralized rollout and updates, (2) drift detection, (3) automatic deployment to new accounts (when using Organizations integration), and (4) standardized execution roles. This is operationally simpler and safer than scripting because StackSets handle orchestration and track deployment state per account/Region.
Option A increases manual work and is error-prone at scale. Options B and C require custom Lambda orchestration, cross-account permissions, and ongoing maintenance for failure modes and change management. StackSets provide the native "least ops" approach to multi-account CloudFormation deployments under Organizations.
質問 # 304
A company uses AWS Systems Manager Session Manager to manage EC2 instances in the eu-west-1 Region.
The company wants private connectivity using VPC endpoints.
Which VPC endpoints are required to meet these requirements? (Select THREE.)
正解：D、E、F
解説：
The AWS Cloud Operations and Systems Manager documentation states that to use Session Manager privately within a VPC (without internet access), three interface VPC endpoints must be configured:
* com.amazonaws. < region > .ssm - enables Systems Manager core API communication.
* com.amazonaws. < region > .ec2messages - allows the agent to send and receive messages between EC2 and Systems Manager.
* com.amazonaws. < region > .ssmmessages - enables real-time interactive communication for Session Manager connections.
These endpoints ensure secure, private connectivity over the AWS network, eliminating the need for public internet routing.
Endpoints for S3, Step Functions, or EC2 API (Options C, E, F) are not required for Session Manager functionality.
Thus, the correct combination is A, B, and D, aligning with AWS CloudOps best practices for secure, private Systems Manager access.
Reference: AWS Cloud Operations & Systems Manager Guide - Configuring VPC Endpoints for Session Manager Private Connectivity
質問 # 305
A developer enables versioning on an Amazon S3 bucket. When the developer attempts to perform a write operation on the bucket, the developer encounters an HTTP 404 NoSuchKey error.
A CloudOps engineer must resolve this issue.
Which solution will meet this requirement?
正解：D
解説：
Changes to S3 bucket versioning are eventually consistent across the S3 control plane.
Immediately after enabling versioning, some operations can temporarily fail until the configuration fully propagates. Waiting for propagation and then retrying the write operation resolves the issue.
質問 # 306
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