The following command set fails to enable OSPF for area 0 on the proper interface: Router5(config)# ipv6 unicast-routing Router5(config)# ipv6 ospf 25 Router5(config-rtr)# router-id 1.1.1. Test your knowledge by trying to configure trunk-based or router-on-a-stick inter-VLAN routing without referring to the appendix. Note: The required commands for Part 3 are provided in Appendix A. It also assigns the router ID under global configuration mode, rather than under router ospf 25 configuration mode as required. method of inter-VLAN routing is called router-on-a-stick. The following command set fails to enable OSPF routing for IPv6, assign a necessary router ID, or enable OSPF for area 0 on the proper interface: Router5(config)# ipv6 ospf 25 Router5(config)# router-id 192.168.5.1 The network command would be used with OSPF v2. This command set also displays incorrect use of the network command. The following command set is incorrect because it does not enable OSPF routing for IPv6, assign a necessary router ID, or enable OSPF for area 0 on the proper interface: Router5(config)# ipv6 ospf 25 Router5(config)# network 192.168.5.0 The last two lines enable OSPF for area 0 on the proper interface. The third assigns a necessary router ID (which was chosen at random) with the router-id command. The second line enables OSPF routing for IPv6 with the ipv6 router ospf command. The first line enables IPv6 routing with the ipv6 unicast-routing command. The correct command sequence would be as follows: Router5(config)# ipv6 unicast-routing Router5(config)# ipv6 router ospf 25 Router5(config-rtr)# router-id 1.1.1.1 Router5(config)# interface S0/0 Router5(config-if)# ipv6 ospf 25 area 0