VMware on AWS - L2 Extension

Hi

i have the below query regarding VMware on AWS.

VMC support L2 extension, which means I can extend my on premise network to AWS

Question:1

Were will be the default gateway for a network when I extend using L2 ? Will it be in on prem or will it be in both

If it is on prem then different vlan communication has to go through my on prem DC

If the DG is both on prem & in AWS, does it mean it uses some thing like Universal logical switch , Universal distributed router functionality using Anycast?