A company has a VPC that includes application workloads that run on Amazon EC2 instances in a single AWS Region. The company wants to use AWS Local Zones to deploy an extension of the application…

Creating a new VPC in the Local Zone and using a Transit Gateway would add unnecessary complexity and cost for communication between a Local Zone and its parent Region's VPC, as Local Zones are designed to be a direct extension of a VPC.

Deploying third-party appliances and creating entirely new VPCs in both the Region and Local Zone for communication is a highly complex and expensive solution, far from being the most cost-effective.

While creating a new subnet in the Local Zone is correct, deploying a third-party appliance in the VPC with interfaces in both the Local Zone and parent Region is an overly complex and costly approach for simple intra-VPC communication.

Creating a new subnet within the existing VPC and assigning it to the Local Zone allows resources deployed there to use private IP addresses from the VPC's CIDR block. This enables seamless and cost-effective bidirectional communication with other workloads in the same VPC in the parent region without requiring complex networking constructs.