ANS-C01 · Question #237
A network engineer is working on a large migration effort from an on-premises data center to an AWS Control Tower based multi-account environment. The environment has a transit gateway that is…
The correct answer is B. Update the existing accounts with an Account Factory Customization (AFC). Select the same C. Create an AWS CloudFormation template that describes the infrastructure that needs to be E. Create an AWSControlTowerBiueprintAccess role in the shared services account. Explanation Options B, C, and E together form a complete Account Factory Customization (AFC) blueprint solution in AWS Control Tower, which is the lowest-overhead approach for automating VPC deployment across new and existing accounts. You first create a CloudFormation template…
Question
A network engineer is working on a large migration effort from an on-premises data center to an AWS Control Tower based multi-account environment. The environment has a transit gateway that is deployed to a central network services account. The central network services account has been shared with an organization in AWS Organizations through AWS Resource Access Manager (AWS RAM). A shared services account also exists in the environment. The shared services account hosts workloads that need to be shared with the entire organization. The network engineer needs to create a solution to automate the deployment of common network components across the environment. The solution must provision a VPC for application workloads to each new and existing member account. The VPCs must be connected to the transit gateway in the central network services account. Which combination of steps will meet these requirements with the LEAST operational overhead? (Choose three.)
Options
- ADeploy an AWS Lambda function to the shared services account. Program the Lambda function
- BUpdate the existing accounts with an Account Factory Customization (AFC). Select the same
- CCreate an AWS CloudFormation template that describes the infrastructure that needs to be
- DDeploy an Amazon EventBridge rule on a default event bus in the shared services account.
- ECreate an AWSControlTowerBiueprintAccess role in the shared services account.
How the community answered
(41 responses)- A17% (7)
- B49% (20)
- D34% (14)
Explanation
Explanation
Options B, C, and E together form a complete Account Factory Customization (AFC) blueprint solution in AWS Control Tower, which is the lowest-overhead approach for automating VPC deployment across new and existing accounts. You first create a CloudFormation template (C) describing the VPC and transit gateway attachment infrastructure, then create the AWSControlTowerBlueprintAccess role (E) in the shared services account to grant Control Tower permission to use that account as a blueprint source, and finally apply the AFC to existing accounts (B) while the blueprint automatically applies to all future accounts - achieving both new and existing account coverage with no custom automation code.
Why the distractors are wrong:
- Option A (Lambda in shared services account): Writing and maintaining a custom Lambda function to provision VPCs introduces significant operational overhead compared to the native AFC approach, which handles this automatically.
- Option D (EventBridge rule in shared services account): While EventBridge can trigger automation on account creation events, combining it with a Lambda function represents a custom-built solution that is far more operationally complex than using built-in AFC functionality.
Memory Tip
Think "C-E-B" as "Create → Enable → Broadcast": Create the CloudFormation template, Enable the blueprint role, then Broadcast it to existing accounts via AFC. AFC is always the low-overhead answer when Control Tower is in the question!
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