A、Configure RRAS2 as a VPN server. Use Web enrollment to acquire computer certificates for both RRAS1 and RRAS2. Create demand-dial L2TP/IPSec connections on both RRAS1 and RRAS2. Configure dial-out credentials on both RRAS1 and RRAS2. Enable the Basic Firewall settings on RRAS1 and RRAS2

B、Configure RRAS2 as a VPN server. Create demand-dial L2TP/IPSec connections on both RRAS1 and RRAS2. Configure dial-out credentials on both RRAS1 and RRAS2. Configure static routes on both RRAS1 and RRAS2. Set the connection type to persistent on the demand-dial interface on both RRAS1 and RRAS2

C、Create a new OU named RRAS Servers in the boston.northwindtraders.com domain. Move RRAS1 into the RRAS Servers OU. On the Default Domain Policy Group Policy object （GPO）， edit the Secure Server （Require Security） IPSec policy. Configure the IPSec policy to use a certificate for authentication. Specify RRAS2 as the tunnel endpoint. Assign the IPSec policy.

D、Create a new OU named RRAS Server in the northwindtraders.com domain. Move the RRAS2 into the RRAS Servers OU. On the RRAS Servers OU create new Group Policy object （GPO） named IPSECPOL. In IPSECPOL create an IPSec policy and specify RRAS as the tunnel.