Your company has a branch office in Sydney (Australia) that has just purchased the AWS Direct Connect link to connect a local data center to AWS resources in the ap-southeast-2 Region. The company also owns lots of AWS EC2 resources in VPCs in the US West Region. You want to use the same Direct Connection for your local data center to communicate with these resources in us-west-1. How would you achieve the requirement?

Answer options:

A.The Direct Connection cannot be used for different Regions. You need to create a new connection in the us-west-1 Region.
B.Create a private virtual interface in the ap-southeast-2 Region and use it to connect the AWS Direct Connect connection to the VPCs in us-west-1.
C.Create a public virtual interface in the us-west-1 Region and set up a VPN over the public virtual interface to protect the data.
D.Create a Direct Connect gateway as a globally available resource. Use it to connect the AWS Direct Connect connection over a private virtual interface to VPCs in us-west-1.

Answer – D
A Direct Connect gateway is a globally available resource. You can create the Direct Connect gateway in any Region and access it from all other Regions. 
A Direct Connect gateway does not allow gateway associations that are on the same Direct Connect gateway to send traffic to each other (for example, a virtual private gateway to another virtual private gateway).
A Direct Connect gateway does not prevent traffic from being sent from one gateway association back to the gateway association itself (for example when you have an on-premises supernet route that contains the prefixes from the gateway association). 
Option A is incorrect because the Direct Connection can be used to access public or private services in a remote region.
Option B is incorrect because you would need to create a Direct Connect gateway in the remote Region (us-west-1) for the connection.
Option C is incorrect because a public virtual interface is required for accessing public services in the remote region.
Option D is CORRECT because the Direct Connect gateway can be created as a globally available resource to communicate with private resources in VPCs.
For more information on accessing a remote AWS Region, please visit the below URL-
https://docs.aws.amazon.com/directconnect/latest/UserGuide/remote_regions.html
https://docs.aws.amazon.com/directconnect/latest/UserGuide/direct-connect-gateways-intro.html