200-301: Cisco Certified Network AssociateDemo

Question

Refer to the graphic. R1 cannot form an OSPF neighbor relationship with R3. What are the possible causes of this issue?

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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.

Explanation

OSPF neighbors must agree on certain parameters before an adjacency can form, including being in the same OSPF area on the shared link and using matching hello and dead timers. If R1 and R3 are configured in different areas, they will not become neighbors. Likewise, if their hello and dead intervals do not match, OSPF neighbor establishment fails. DR/BDR status, static routes, or the presence of EIGRP do not by themselves prevent OSPF neighbor formation.

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200-301: Cisco Certified Network AssociateDemo

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