Router R1 currently has no configuration related to IPv6 or IPv4. The following configuration
exists in a planning document, intended to be used to copy/paste into
Router R1 to enable OSPFv3 on interfaces F0/0 and S0/0/0. No other related configuration
exists. Assuming F0/0 and S0/0/0 reach an up/up state, which of the following is true about
OSPFv3 on R1 after this configuration has been pasted into R1?
ipv6 router ospf 1
ipv6 unicast-routing
interface f0/0
ipv6 address 2000::1/64
ipv6 ospf 1 area 1
interface s0/0/0
ipv6 address 2001::/64 eui-64
ipv6 ospf 1 area 0

A.
OSPF works on F0/0 and S0/0/0 without further configuration.

B.
OSPF works with the addition of one command: a no shutdown command in OSPF router
configuration modE.

C.
OSPF works with the addition of one command: an router-id command in OSPF router
configuration modE.

D.
OSPFv3 needs at least two more configuration commands before it works on R1.

Explanation:

Because the question states that no IPv4 configuration exists, OSPFv3 cannot derive a 32-
bit OSPF router ID. Before OSPFv3 works, R1 needs to define an OSPF router ID (using the
OSPF router-id command).