You have configured a dynamic VPN between your datacenter and your VPC. But you are not able to see the routes for the connection. What could be the possible reason for this?

Answer options:

A.The NACL`s are not configured properly
B.The internal firewall is blocking the routes
C.The route propogation is not set in the Route table
D.You have not set BFD for the connection

Answer - C
For routes to be dynamically setup , you neeed to have route propogation setup on your routing table
The AWS documentation in addition mentions the following
If you`ve attached a virtual private gateway to your VPC and enabled route propagation on your route table, routes representing your VPN connection automatically appear as propagated routes in your route table
For more information on Route tables please refer to the below URL:
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Route_Tables.html