Which service would you use to create a virtual private network (VPN) in AWS?

Using AWS Site-to-Site VPN is the appropriate choice for creating a virtual private network (VPN) in AWS. This service establishes a secure and encrypted connection between your on-premises network and your AWS Virtual Private Cloud (VPC) over the internet. It allows you to extend your existing data center or office network into the cloud, thus creating a hybrid architecture that can integrate both environments seamlessly.

AWS Site-to-Site VPN supports the IPsec protocol, which encrypts the data being transmitted, ensuring privacy and security during transmission. It provides an easy way to connect your existing infrastructure with AWS, allowing for secure data transfer and resource accessibility.

In contrast, AWS Direct Connect is focused on providing a dedicated network connection from your premises to AWS, suitable for high-throughput requirements but not specifically for establishing a virtual private network. AWS Lambda, a serverless computing service, does not deal with network connections at all. AWS VPN Gateway is part of the AWS Site-to-Site VPN architecture and is not a standalone service for creating a VPN; it is a component that facilitates the VPN connection. Therefore, the choice of using AWS Site-to-Site VPN is the most direct and efficient option for implementing a VPN in AWS.