350-401 Question 145
Select 2You are tasked with configuring OSPFv2 in a network with multiple areas. The network includes a point-to-point link between two routers (R1 and R2) and a broadcast segment with multiple routers. You must ensure that the OSPF adjacency forms correctly, unnecessary OSPF advertisements are minimized, and summarization is implemented at the Area Border Router (ABR). Which of the following configurations should be applied?
- A
Configure the network type on the point-to-point link between R1 and R2 as 'point-to-point'.
- B
Set the broadcast segment interface to 'passive-interface' to suppress OSPF advertisements.
- C
Apply an OSPF area range command on the ABR to summarize routes from a specific area.
- D
Enable OSPF authentication on all interfaces for security and adjacency formation.
- E
Manually configure OSPF neighbors on the broadcast segment.
Show answer and explanation
Correct answers: A, C
Explanation
To configure OSPFv2 in a network with multiple areas effectively, it is essential to set the correct network type for point-to-point links to avoid unnecessary DR/BDR elections and ensure proper adjacency formation. Additionally, summarization at the ABR using the 'area range' command is critical for optimizing route advertisements between areas. Other configurations, such as passive interfaces or manual neighbor configuration, either prevent adjacency or are unnecessary in this scenario.
- A. Correct.
Correct. Configuring the network type as 'point-to-point' ensures proper OSPF operation on links where there are only two routers, as it eliminates the need for DR/BDR elections.
- B. Incorrect.
Incorrect. Setting the broadcast segment interface to 'passive-interface' would suppress OSPF hellos, preventing adjacency formation on that segment.
- C. Correct.
Correct. The 'area range' command on the ABR is used to summarize routes between OSPF areas, reducing the size of the routing table and improving network efficiency.
- D. Incorrect.
Incorrect. While OSPF authentication is a good security practice, it is not a requirement for adjacency formation unless explicitly configured.
- E. Incorrect.
Incorrect. Manually configuring OSPF neighbors is not required for broadcast network types, as OSPF automatically discovers neighbors on such networks.