Final answer:
To use Amazon S3 and DynamoDB within a private VPC, AWS PrivateLink is used to establish a secure connection using private IPs. AWS PrivateLink enhances security and potentially improves latency and bandwidth by keeping the traffic within the AWS network.
Step-by-step explanation:
To use Amazon S3 and Amazon DynamoDB in a private VPC, you would use AWS PrivateLink. AWS PrivateLink allows you to privately access services hosted on the AWS network in a secure and scalable manner. Instead of using public IPs, it uses private IPs from your VPC to establish a private connection to supported AWS services, other VPCs, and on-premises applications.
To set this up, you would create an endpoint in your VPC that would serve as an entry point for all traffic destined to S3 or DynamoDB. After creating the VPC endpoint, the service can be used without the need for an Internet gateway, NAT device, VPN connection, or AWS Direct Connect connection. This does not only add a layer of security by keeping traffic within the AWS network but also often improves latency and bandwidth.