A networking professional is tasked with establishing a VPN connection allowing multiple types of traffic (such as multicast and IPv6) over a single point-to-point link. The professional must be able to encapsulate various protocols for routing over an IP network without the requirement for encryption. Which of the following is the BEST solution for this scenario?
Layer 2 Tunneling Protocol (L2TP)
Generic Routing Encapsulation (GRE)
Point-to-Point Tunneling Protocol (PPTP)
Internet Protocol Security (IPSec)