Using new backup router in spite of faulty one in ospf domain but relationship with neighbor in one interface only not working, what is the reason of this problem?(choose 2)

Using new backup router in spite of faulty one in ospf domain but relationship with neighbor in one interface only not working, what is the reason of this problem?(choose 2)
A . area Id mismatch
B . authentication mismatch
C . process id of ospf not match
D . ospf timers not match

View Answer

Answer: AD