You are designing a multisite VPN solution for a customer and you are concerned with the additional overhead
of point-to-point tunnels and the associated overlay routing with DMVPN. How does a GDOI-based VPN
eliminate the additional tunnel and routing overhead found in DMVPN?
A. The GDOI-based VPN requires overlaying a secondary routing infrastructure through the tunnels.
B. In a GDOI-based VPN, all group members share a common security association.
C. The GDOI-based VPN requires the provisioning of a complex connectivity mesh.
D. The GDOI-based VPN leverages the routing protocol to find its peer for tunnel setup.

Answer: B

Explanation: