A company is planning to use Amazon S3 to archive financial data. The data is currently stored in an on-premises data center. The company uses AWS…

This solution meets all requirements for private, encrypted data transfer. A transit VIF is the correct interface type for connecting AWS Direct Connect to a Transit Gateway. An interface VPC endpoint for Amazon S3 creates a private endpoint with an IP address in your VPC, allowing on-premises systems to access S3 via the private Direct Connect path without traversing the public internet. Layering an IPsec VPN over the Direct Connect connection provides robust, network-level encryption. This, combined with application-level HTTPS encryption, creates a multi-layered security posture appropriate for sensitive financial data, fulfilling the "encrypted in transit" requirement comprehensively.

A. A public VIF is used to access AWS public endpoints. This does not provide a fully private path from the on-premises data center to the S3 service, violating a key requirement.

C. This option provides a private path and HTTPS encryption, but it lacks the network-level IPsec encryption. For sensitive financial data, relying solely on HTTPS may not meet stringent compliance or security policies.

D. This option describes an invalid architecture. A public VIF cannot be attached to a Transit Gateway; a transit VIF is required. Furthermore, you cannot create a direct "attachment for Amazon S3" on a Transit Gateway.

1. AWS Direct Connect User Guide: Under the section "AWS Site-to-Site VPN over Direct Connect," the documentation states, "You can combine AWS Direct Connect and AWS Site-to-Site VPN to create an IPsec-encrypted connection between your on-premises network and an Amazon VPC." This supports the pattern of using an IPsec VPN over Direct Connect for enhanced encryption.

2. AWS PrivateLink Guide: In the section "Access an AWS service using an interface VPC endpoint," it is noted that "Interface endpoints are supported for access from on-premises networks through AWS Direct Connect or AWS Site-to-Site VPN." This confirms that an interface endpoint is the correct mechanism for private on-premises access to S3.

3. AWS Direct Connect User Guide: The section on "Virtual interfaces" specifies that a "Transit virtual interface" is used "to connect your AWS Direct Connect connection to a Direct Connect gateway" which is then associated with a Transit Gateway. This validates the use of a transit VIF in the proposed architecture.

4. AWS Transit Gateway Guide: The documentation on "Transit gateway attachments" describes how a "Direct Connect gateway attachment" is used to connect a Direct Connect gateway to the Transit Gateway, and a "VPC attachment" is used to connect VPCs, confirming the routing path.