nerdexam
Cisco

350-501 · Question #217

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?

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.

Networking

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

How the community answered

(33 responses)
  • B
    94% (31)
  • C
    3% (1)
  • D
    3% (1)

Why each option

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.

Aip ospf network braodcast in interfaces running OSPF

The 'broadcast' network type is the default for Ethernet interfaces and inherently requires DR/BDR elections.

Bip ospf network point-to-point on interfaces running OSPFCorrect

Setting the OSPF network type to 'point-to-point' explicitly tells OSPF that only two routers are present on the link, thereby eliminating the necessity for a Designated Router (DR) or Backup Designated Router (BDR) election.

Cip ospf network multipoint-to-point on interfaces running OSPF

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.

Dip ospf network non-braodcast on interfaces running OSPF

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

Source: https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13689-18.html

Topics

#OSPF#OSPF Network Types#DR/BDR Election#Routing Protocols

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