VPC peering provides a direct, one-to-one network connection between two VPCs. This allows resources in either VPC to communicate with each other using private IP addresses as if they are on the same network. It is a non-transitive, point-to-point connection.

AWS Transit Gateway acts as a network transit hub, or a "cloud router," that you can use to interconnect multiple VPCs and on-premises networks. By attaching VPCs to a single Transit Gateway, you enable communication between them through a central hub-and-spoke model, simplifying network architecture and management.

A. VPC endpoints enable private connections from a VPC to supported AWS services or endpoint services, not to another VPC.

B. Amazon Route 53 is a Domain Name System (DNS) service; it resolves domain names to IP addresses but does not create network connections.

D. AWS Direct Connect establishes a dedicated private network connection from an on-premises environment to AWS, not between two AWS VPCs.

1. AWS Documentation

Amazon VPC User Guide: "What is VPC peering?" - This section states

"A VPC peering connection is a networking connection between two VPCs that enables you to route traffic between them using private IPv4 addresses or IPv6 addresses."

2. AWS Documentation

AWS Transit Gateway User Guide: "What is a transit gateway?" - This document explains

"An AWS Transit Gateway is a network transit hub that you can use to interconnect your virtual private clouds (VPCs) and on-premises networks."

3. AWS Documentation

Amazon VPC User Guide: "VPC endpoints" - The introduction clarifies

"A VPC endpoint enables you to privately connect your VPC to supported AWS services and VPC endpoint services powered by AWS PrivateLink..."

4. AWS Documentation

AWS Direct Connect User Guide: "What is AWS Direct Connect?" - The guide states

"AWS Direct Connect is a cloud service solution that makes it easy to establish a dedicated network connection from your premises to AWS."