Which two statements are true about OSPFv3? (Choose two.)
A.
OSPFv3 uses a 32-bit router ID to uniquely identify a node in the network.
B.
OSPFv3 uses a 128-bit router ID to uniquely identify a node in the network.
C.
OSPFv3 routes are always preferred over OSPFv2 routes for all traffic.
D.
OSPFv3 and OSPFv2 can be configured at the same time.
The correct answers are A and D
The Junos implementation allows for the configuration of both OSPFv2 and OSPFv3 at the same time, just as BGP and other protocols can be configured at the same as OSPF. However, since these are configured and treated as separate protocols the routing table views them separately. In other words, routes from OSPFv2 and OSPFv3 are never compared to each other. The protocol specification for OSPFv3 mandates the use of a 32-bit router ID, which is the same value used by OSPFv2.