Which step must you perform first to enable OSPFv3 process 20 for IPv6?
A. Enter the ipv6 router ospf 20 command to enable OSPFv3.
B. Enter the ip routing command to enable IPv4 unicast routing.
C. Enter the router ospf 20 commands to enable OSPF.
D. Enter the ipv6 unicast-routing command to enable IPv6 unicast routing.
I really hate Cisco asks a question like this but yeah the answer is D as it doesn’t mention that IPv6 routing is enabled on the router.
By Default IPV6 unicast Routing is always disable
R1(config)#ipv6 router ospf 20
% IPv6 routing not enabled
R1(config)#ipv6 unicast-routing
R1(config)#ipv6 router ospf 20
R1(config-rtr)#
The question asks what you must perform *first*. The correct answer is D
From the reference, the correct answer seems to be A.
interface Serial0/0
no ip address
ipv6 address 2002:ABAB::/64 eui-64
ipv6 enable
ipv6 ospf 1 area 2
!
ipv6 router ospf 1
router-id 1.1.1.1
area 2 stub no-summary
!