The development team has recently developed a new application that will be using the IPv6 address. This application will be deployed on an EC2 instance within a Test VPC. The application needs to have communication with database servers deployed in your Production VPC in the same region. As a SysOps administrator, you are planning to create a peering between these two VPC. Which of the following is True while creating a VPC peering over the IPv6 CIDR block? 

Answer options:

A.VPC Peering can be established for IPv6 CIDR block with overlapping IPv4 CIDR block.
B.VPC peering needs to be established for IPv4 CIDR block between these 2 VPC & then peering for IPv6 CIDR block.
C.VPC Peering is not supported for IPv6 CIDR block.
D.VPC Peering cannot be established for IPv6 CIDR block with overlapping IPv4 CIDR block.

Correct Answer: D
While establishing VPC peering over the IPv6 CIDR block, there should be no overlapping IPv4 CIDR block.
Inter-Region VPC Peering allows VPC resources like Amazon EC2 instances, Amazon RDS databases, and AWS Lambda functions running in different AWS Regions to communicate with each other using private IP addresses, without requiring gateways, VPN connections, or separate physical hardware.
Option A is incorrect as VP peering over IPv6 CIDR block is supported for inter and intra-region with non-overlapping IPv4 CIDR block.
Option B is incorrect as VPC peering on IPv4 is not required for IPv6 VPC peering. A stand-alone VPC peering can be configured.
Option C is incorrect as VPC peering is supported for IPv6.
Invalid Configurations
Overlapping CIDR blocks
Transitive peering
Edge to edge routing through a gateway or private connection
For more information on VPC peering for IPv6 CIDR blocks, refer to the following URL-
https://docs.aws.amazon.com/vpc/latest/peering/invalid-peering-configurations.html
https://aws.amazon.com/about-aws/whats-new/2018/02/inter-region-vpc-peering-is-now-available-in-nine-additional-aws-regions/
https://docs.aws.amazon.com/vpc/latest/peering/vpc-peering-basics.html