Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 311

A customer is running an mGRE DMVPN tunnel over WAN infrastructure between hub and spoke sites. The existing configuration allows NHRP to add spoke routers automatically to the multicast NHRP mappings. The customer is migrating 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 tunnels on spoke routers?

Answer options

Correct answer: B

Explanation

The 'tunnel mode ipv6ip auto-tunnel' configuration allows the spoke routers to establish DMVPN tunnels that can handle both IPv4 and IPv6 traffic. The other configurations like 6to4, 6rd, and isatap serve specific purposes for IPv6 transition technologies but do not support the dual-stack functionality required in this scenario.