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Which protocol supports tunneling of non-IP traffic?
Correct Answer: A
Explanation/Reference: Explanation: The GRE protocol (Generic Routing Encapsulation) which is a tunneling protocol that can encapsulate a variety of network layer packet types into a GRE tunnel. GRE therefore can encapsulate multicast traffic, routing protocols (OSPF, EIGRP etc) packets, and other non-IP traffic inside a point-to-point tunnel. Reference: http://www.networkstraining.com/passing-non-ip-traffic-over-ipsec-vpn-using-gre-over-ipsec/