Which interface-level command adds an IPv4 interface into OSPFv3 process 1 under the IPv4 address family?
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Correct answer: Router(config-if)#ospfv3 1 ipv4 area 0.
Why this is the answer
The command Router(config-if)ospfv3 1 ipv4 area 0 correctly enables OSPFv3 for IPv4 on a specific interface. OSPFv3 uses address families to support both IPv4 and IPv6. This command specifies OSPFv3 process ID 1, the IPv4 address family, and assigns the interface to area 0. router ospfv3 1 address-family ipv4 is a global configuration command used to enter the OSPFv3 IPv4 address family configuration mode, not to enable OSPF on an interface. Router(config-router)ospfv3 1 ipv4 area 0 is syntactically incorrect for router configuration mode; interface-level configuration is required. router ospfv3 1 address-family ipv4 unicast is also a global configuration command to enter the address family configuration, with unicast being the default and often implied.
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