What is the MOST secure way to access the table while ensuring that the traffic does not leave the AWS network?
Use a VPC endpoint for DynamoDB.
Use a NAT gateway in a public subnet.
Use a NAT instance in a private subnet.
Use the internet gateway attached to the VPC.
Explanations:
A VPC endpoint for DynamoDB allows private subnets to access DynamoDB without routing traffic over the internet, ensuring both security and compliance with AWS best practices.
A NAT gateway in a public subnet is used for outbound internet access, which would route traffic outside the AWS network, compromising security.
A NAT instance in a private subnet would not be able to route traffic to DynamoDB, as it requires a public IP for outbound access, leading to traffic leaving the AWS network.
Using an internet gateway attaches the VPC to the internet, allowing traffic to leave the AWS network, which is not secure for accessing resources like DynamoDB from private subnets.
My best guess is:
Use a VPC endpoint for DynamoDB.