You are designing the network infrastructure for an application server in Amazon VPC. Users will access all the application instances from the Internet as well as from an on-premises network. The on-premises network is connected to your VPC over an AWS Direct Connect link. You want to simplify the AWS routes from your on-premises network to your VPC to reduce the number of routes in the table. You do not foresee any additional external routing requirements in the future. How would you design routing to meet the above requirements?

Answer options:

A.Configure a single routing table with a default route via the Virtual Private Gateway. Propagate a default route via BGP on the AWS Direct Connect customer router. Associate the routing table with all VPC subnets.
B.Configure a single routing table with a default route via the Virtual Private Gateway. Propagate specific routes for the on-premises networks via BGP on the AWS Direct Connect customer router. Associate the routing table with all VPC subnets.
C.Configure a single routing table with two default routes: one to the Internet via a Virtual Private Gateway the other to the on-premises network via the VPN gateway. Use this routing table across all subnets in your VPC.D.Configure two routing tables: one that has a default route via the Virtual Private Gateway and another that has a default route via the VPN gateway. Associate both routing tables with each VPC subnet.

Answer - B
Option A is INCORRECT because we would have conflicts when using the default route.
Option C is INCORRECT because we cannot propagate two default routes. Instead, a single default route should be used.
Option D is incorrect because the subnet where the instances are placed can have a single routing table associated with them.
More information on Route Tables and Directconnect:
https://docs.aws.amazon.com/vpc/latest/userguide/VPC_Route_Tables.html
https://docs.aws.amazon.com/directconnect/latest/UserGuide/dc-ug.pdf