DRAG DROP
Your network contains an Active Directory forest named contoso.com. The forest contains a
Network Policy Server (NPS) server named NPS1 and a VPN server named VPN1. VPN1 forwards all
authentication requests to NPS1.
A partner company has an Active Directory forest named adatum.com. The adatum.com forest
contains an NPS server named NPS2.
You plan to grant users from adatum.com VPN access to your network.
You need to authenticate the users from adatum.com on VPN1.
What should you create on each NPS server?
To answer, drag the appropriate objects to the correct NPS servers. Each object may be used once,
more than once, or not at all. You may need to drag the split bar between panes or scroll to view
content.
Answer: 
correect
“To configure a server running NPS to act as a RADIUS proxy and forward connection requests to other NPS or RADIUS servers, you must configure a remote RADIUS server group in addition to adding a new connection request policy that specifies conditions and settings that the connection requests must match.”
https://technet.microsoft.com/en-us/library/cc730866(v=ws.10).aspx