Which of the following services would be best for providing a low-cost hub-and-spoke model for primary or backup connectivity between these remote offices?

Your manager has just given you access to multiple VPN connections that someone else has recently set up between all your company’s offices. She needs you to make sure that the communication between the VPNs is secure.

Which of the following services would be best for providing a low-cost hub-and-spoke model for primary or backup connectivity between these remote offices?
A . Amazon CloudFront
B . AWS Direct Connect
C . AWS CloudHSM
D . AWS VPN CloudHub

Answer: D

Explanation:

If you have multiple VPN connections, you can provide secure communication between sites using the AWS VPN CloudHub. The VPN CloudHub operates on a simple hub-and-spoke model that you can use with or without a VPC. This design is suitable for customers with multiple branch offices and existing Internet connections who would like to implement a convenient, potentially low-cost hub-and-spoke model for primary or backup connectivity between these remote offices.

Reference: http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPN_CloudHub.html