Which tunneling mechanism carries multicast between remote sites and supports encryption?
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Correct answer: GRE over IPsec.
Why this is the answer
GRE over IPsec is the correct answer because Generic Routing Encapsulation (GRE) tunnels can carry multicast traffic, and IPsec provides encryption and authentication for the GRE tunnel. This combination securely transports multicast between remote sites. ISATAP (Intra-Site Automatic Tunnel Addressing Protocol) is an IPv6 transition mechanism that encapsulates IPv6 packets over an IPv4 network, but it does not inherently support multicast or encryption. IPsec over ISATAP would provide encryption but still wouldn't natively handle multicast within the ISATAP context. GRE alone supports multicast but lacks encryption.
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