Free Cisco 300-410 ENARSI Actual Exam Questions - Question 1 Discussion
sites. The existing configuration allows NHRP to add spoke routers automatically to the multicast
NHRP mappings. The customer is migrated the network from IPv4 to the IPv6 addressing scheme for
those spokes’ routers that support IPv6 and can run DMVPN tunnel over the IPv6 network. Which
configuration must be applied to support IPv4 and IPv6 DMVPN tunnel on spoke routers?
Maybe D makes sense here because 6rd is specifically designed for IPv6 deployment over IPv4 infrastructure, which fits a transition scenario like this. Auto-tunnel (C) does support dual stack, but it’s more generic and might not handle the IPv4-to-IPv6 migration as smoothly in some cases. Since the question mentions migration and coexistence, 6rd could be the better fit for encapsulating IPv6 over an IPv4 DMVPN core. Also, 6to4 (A) and isatap (B) are more legacy or specialized, so less likely for a full dual-stack DMVPN setup.
C/D? I think C fits because auto-tunnel handles both IPv4 and IPv6, but if the network uses 6rd for IPv6 over IPv4, D might work too. The question’s a bit vague on the exact IPv6 tunneling method.
Not B, since ISATAP is more for IPv6 over IPv4 LANs, not dual-stack VPN tunnels. Auto-tunnel in C makes sense here to handle both IPv4 and IPv6 traffic inside the tunnel seamlessly.
C/D? I think the key is supporting both IPv4 and IPv6 over the tunnel, so auto-tunnel in C sounds like it fits better than 6rd which is more for ISP transition. Not sure though.