What are the four main steps in configuring a GRE tunnel over IPsec on Cisco routers?
(Choose Four)
A.
Configure a physical interface or create a loopback interface to use as the tunnel endpoint.
B.
Create the GRE tunnel interfaces.
C.
Add the tunnel interfaces to the routing process so that it exchanages routing updates across
that interface.
D.
Add the tunnel subnet to the routing process so that it exchanages routing updates across that
interface.
E.
Add all subnets to the crypto access-list, so that IPsec encrypts the GRE tunnel traffic.
F.
Add GRE traffic to the crypto access-list, so that IPsec encrypts the GRE tunnel traffic.
Explanation:
Reference:
http://www.cisco.com/public/technotes/smbsa/en/us/internet/Sec_GRE_tunnel_ovr_IPSEC.pdf