When it comes to sending multicast traffic over a site-to-site VPN, the technology commonly used is GRE (Generic Routing Encapsulation) over IPsec. On IOS Router, you can configure GRE over IPsec to enable multicast traffic to traverse the VPN tunnel. It encapsulates multicast packets into GRE packets, which are then encrypted using IPsec. As for FTD (Firepower Threat Defense), it doesn't natively support GRE tunneling. However, you can still achieve multicast over IPsec functionality by using a workaround called IPsec Tunnel Mode over Transport Mode, which allows multicast traffic to pass through the IPsec tunnel. In summary, both IOS Router and FTD can handle multicast traffic over a site-to-site VPN, but the specific implementation may differ
GRE is not supported in FTD, so A is correct
https://www.cisco.com/c/en/us/support/docs/security-vpn/ipsec-negotiation-ike-protocols/216276-configure-route-based-site-to-site-vpn-t.html#anc6
GRE ist not supported on FTD > B is wrong.
But the classic case is answer A , which is correct.
upvoted 4 times
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