350-501 · Question #217
350-501 Question #217: Real Exam Question with Answer & Explanation
The correct answer is B: ip ospf network point-to-point on interfaces running OSPF. To remove DR/BDR elections from OSPF interfaces, the OSPF network type must be configured to a mode that does not require such elections. This typically applies to direct, two-router connections.
Question
Refer to the exhibit. An engineer implemented OSPF neighbor relationship on an IOS device. Which configuration must be applied to get the OR/BOR election removed from interfaces running OSPF?
Options
- Aip ospf network braodcast in interfaces running OSPF
- Bip ospf network point-to-point on interfaces running OSPF
- Cip ospf network multipoint-to-point on interfaces running OSPF
- Dip ospf network non-braodcast on interfaces running OSPF
Explanation
To remove DR/BDR elections from OSPF interfaces, the OSPF network type must be configured to a mode that does not require such elections. This typically applies to direct, two-router connections.
Common mistakes.
- A. The 'broadcast' network type is the default for Ethernet interfaces and inherently requires DR/BDR elections.
- C. The 'multipoint-to-point' network type, while useful for certain topologies, still implies a multi-access environment where DR/BDR elections or similar mechanisms are often needed.
- D. The 'non-broadcast' network type is used for NBMA networks and explicitly requires DR/BDR elections, along with static neighbor configurations.
Concept tested. OSPF network types and DR/BDR election
Reference. https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13689-18.html
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