Your network contains an Active Directory domain.

You plan to implement a remote access solution that will contain three servers that run Windows Server 2012. The servers will be configured as shown in the following table.

Server1 will support up to 200 concurrent VPN connections.

You need to ensure that all VPN connection requests are authenticated and authorized by either Server2 or Server3. The solution must ensure that the VPN connections can be authenticated if either Server2 or Server3 fails.

What should you do?

A. On Server1, configure a RADIUS proxy. On Server2 and Server3, add a RADIUS client.

B. On Server2 and Server3, add a RADIUS client. On Server1, modify the Authentication settings.

C. On Server1, configure a RADIUS proxy. Add Server2 and Server3 to a failover cluster.

D. Add Server2 and Server3 to a Network Load Balancing (NLB) cluster. On Server1, modify the Authentication settings.

Explanation:

* A network access server (NAS) is a device that provides some level of access to a larger network. A NAS using a RADIUS infrastructure is also a RADIUS client, sending connection requests and accounting messages to a RADIUS server for authentication, authorization, and accounting.

* Client computers, such as wireless portable computers and other computers running client operating systems, are not RADIUS clients. RADIUS clients are network access servers-”such as wireless access points, 802.1X-capable switches, virtual private network (VPN) servers, and dial-up servers-”because they use the RADIUS protocol to communicate with RADIUS servers such as Network Policy Server (NPS) servers.