An OSPF neighbor between routers R1 and R2 is stuck in loading state on R2. What are
two causes? (Choose two.)
A.
OSPF is not enabled on the interfaces.
B.
A firewall filter is blocking OSPF hellos on both sides.
C.
The R1 router has received a corrupted link-state request packet.
D.
The interface MTU is mismatched between the routers.
Explanation: