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What two features are benefits of using GRE tunnels with IPsec over using an IPsec tunnel alone in building-to-building site-to-site VPNs? (Choose two.)
Correct Answer: A,D
Explanation/Reference: Explanation: A drawback of IPSec is it does not support multicast traffic. But most popular routing protocols nowadays rely on multicast (like OSPF, EIGRP, RIP... except BGP) to send their routing updates. A popular solution to this is using GRE tunnels. GRE tunnels do support transporting IP multicast and broadcast packets to the other end of the GRE tunnel -> A is correct. Non-IP traffic (such as IPX, AppleTalk) can be wrapped inside GRE encapsulation and then this packet is subjected to IPSec encapsulation so all traffic can be routed -> D is correct.