Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 411

IPv6 is enabled in the infrastructure to support customers with an IPv6 network over WAN and to connect the head office to branch offices in the local network.
One of the customers is already running IPv6 and wants to enable IPv6 over the DMVPN network infrastructure between the headend and branch sites.
Which configuration command must be applied to establish an mGRE IPv6 tunnel neighborship?

Answer options

Correct answer: B

Explanation

The correct command is 'tunnel mode gre multipoint ipv6' because it specifically configures the tunnel to support mGRE with IPv6. The other options do not establish the tunnel format needed for mGRE; 'ipv6 nhrp holdtime 30' relates to NHRP hold time, 'ipv6 unicast-routing' enables IPv6 routing but not the tunnel configuration, and 'tunnel protection mode ipv6' pertains to securing the tunnel rather than configuring its mode.