Which DX configuration should be implemented to meet these requirements?
Configure a DX connection with a VPN on top of it.
Configure DX connections at multiple DX locations.
Configure a DX connection using the most reliable DX partner.
Configure multiple virtual interfaces on top of a DX connection.
Explanations:
While a VPN can add resilience, it does not fully leverage the benefits of Direct Connect. The primary focus should be on optimizing the DX connection itself.
Configuring DX connections at multiple locations ensures redundancy and high availability, which meets the requirement for highly resilient connectivity.
Selecting a reliable DX partner is important, but it does not inherently guarantee high resilience without multiple connections or locations.
Multiple virtual interfaces can help with segmentation, but they do not provide redundancy or resilience in the physical connectivity itself.
I reckon the answer is:
Configure DX connections at multiple DX locations.