What is the encryption method is used in aws direct connect ?

Is the primary use of Direct Connect to establish more consistent and secure cross-region VPC connections that offer lower latency, higher bandwidth, and potentially lower costs compared to internet-based connections?

Does Direct Connect provide a dedicated private network connection from your on-premises environment to AWS, thereby bypassing the public internet?

Is a Direct Connect gateway (DGW) more scalable and cost-effective for connecting multiple VPCs, possibly across regions, through a single Direct Connect connection, thereby reducing infrastructure and administrative overhead?

What is the difference between virtual private gateway and direct connect gateway?