You have an existing auto-mode VPC named Retail. You want to create a VPC named Distribution and peer it with Retail. How should you configure Distribution?
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Correct answer: Create the Distribution VPC in custom mode with CIDR 10.0.0.0/9, create subnets as needed, then peer via VPC Network Peering..
Why this is the answer
The existing auto-mode VPC, Retail, uses the 10.128.0.0/9 CIDR range. To successfully peer two VPCs, their IP address ranges cannot overlap. Therefore, the new Distribution VPC must be created with a non-overlapping CIDR range. Creating Distribution in custom mode with 10.0.0.0/9 ensures a distinct address space, allowing for successful VPC Network Peering. Creating Distribution in auto mode would assign it the same 10.128.0.0/9 range, leading to an IP overlap and preventing peering. Using 10.128.0.0/9 for Distribution in custom mode also results in an overlap. Renaming the default VPC is irrelevant to creating a new, peerable VPC with a specific configuration.
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