单选题what is the cause of this problem?（）AThe OSPF area is not configured properly.BThe priority on R1 should be set higher.CThe cost on R1 should be set higher.DThe hello and dead timers are not configured properly.EA backup designated router needs to be added to the network.FThe OSPF process ID numbers must match.
单选题
what is the cause of this problem?（）
A
The OSPF area is not configured properly.
B
The priority on R1 should be set higher.
C
The cost on R1 should be set higher.
D
The hello and dead timers are not configured properly.
E
A backup designated router needs to be added to the network.
F
The OSPF process ID numbers must match.
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