Cisco 100-105 Exam

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. DF
Answer: Option Explanation.
Explanation: 

To become OSPF neighbors, routers must meet these requirements: Hello interval, Dead interval and AREA number -> D and F are correct.

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