Which two steps must you perform on each device that is configured for ipv4 routing before you implement OSPFv3? (chooose two)
A. configure an autonomous system number
B. configure a loopback interface
C. configure a router ID
D. enable IPv6 on an interface
E. enable IPv6 unicast routing
D and E
https://www.cisco.com/c/en/us/support/docs/ip/ip-version-6-ipv6/112100-ospfv3-config-guide.html
Requirements
Before you enable OSPF for IPv6 on an interface, you must perform the following:
Complete the OSPF network strategy and planning for your IPv6 network. For example, you must decide whether multiple areas are required.
Enable IPv6 unicast routing.
Enable IPv6 on the interface.
Configure the IP Security (IPsec) secure socket application program interface (API) on OSPF for IPv6 in order to enable authentication and encryption.
DE