What is the MOST cost-effective method to establish this type of connection?
Implement a client VPN.
Implement AWS Direct Connect.
Implement a bastion host on Amazon EC2.
Implement an AWS Site-to-Site VPN connection.
Explanations:
A client VPN is designed for individual users rather than a secure connection between on-premises and AWS, making it less suitable for this scenario.
AWS Direct Connect provides dedicated connections and is more suitable for high bandwidth needs. It is also typically more expensive and takes longer to set up compared to other options.
A bastion host provides secure access to instances in a private subnet but does not establish a secure connection between on-premises and AWS. It is not a direct connection method.
An AWS Site-to-Site VPN is a cost-effective method for creating a secure connection between on-premises and AWS that can be set up quickly and handles small amounts of traffic effectively.
I suspect that the answer is:
Implement an AWS Site-to-Site VPN connection.