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R1 is unable to establish an OSPF neighbor relationship with R3. What are possible reasons for this problem? (Choose two.)

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Refer to the graphic. R1 is unable to establish an OSPF neighbor relationship with R3. What are possible reasons for this problem? (Choose two.) 


 
A. All of the routers need to be configured for backbone Area 1. 
B. R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3 
C. A static route has been configured from R1 to R3 and prevents the neighbor adjacency from being established. 
D. The hello and dead interval timers are not set to the same values on R1 and R3. 
E. EIGRP is also configured on these routers with a lower administrative distance. 
F. R1 and R3 are configured in different areas. 

Correct Answer: DF 
Explanation 
Explanation/Reference: 
A is not correct because the backbone area of OSPF is always Area 0. 
B is not correct because R1 or R3 must be the DR or BDR -> it has to establish neighbor adjacency withthe other. 
C is not correct because OSPF neighbor relationship is not established based on static routing. It uses multicast address 224.0.0.5 to establish OSPF neighbor relationship. 
E is not correct because configure EIGRP on these routers (with a lower administrative distance) will force these routers to run EIGRP, not OSPF.D and F are correct because these entries must match on neighboring routers:
– Hello and dead intervals 
– Area ID (Area 0 in this case) 
– Authentication password 
– Stub area flag

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unable to establish an OSPF neighbor relationship

R1 is unable to establish an OSPF neighbor relationship with R3. What are possible reasons for this problem? (Choose two.)
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