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350-501 · Question #153

Refer to the exhibit. A network engineer is implementing OSPF multiarea. Which command on interface GO/1 resolves adjacency issues in the new area?

The correct answer is B. ip ospf network point-to-point. To resolve OSPF adjacency issues on interface G0/1 in a multiarea configuration, especially on a direct link between two routers, setting the OSPF network type to point-to-point can simplify adjacency formation.

Networking

Question

Refer to the exhibit. A network engineer is implementing OSPF multiarea. Which command on interface GO/1 resolves adjacency issues in the new area?

Exhibit

350-501 question #153 exhibit

Options

  • Aip ospf network broadcast
  • Bip ospf network point-to-point
  • Cip ospf network non-broadcast
  • Dip ospf network point-to-multipoint

How the community answered

(31 responses)
  • A
    3% (1)
  • B
    81% (25)
  • C
    6% (2)
  • D
    10% (3)

Why each option

To resolve OSPF adjacency issues on interface G0/1 in a multiarea configuration, especially on a direct link between two routers, setting the OSPF network type to point-to-point can simplify adjacency formation.

Aip ospf network broadcast

`ip ospf network broadcast` is the default for Ethernet interfaces and assumes a multi-access segment with DR/BDR election, which might cause issues on a direct two-router link.

Bip ospf network point-to-pointCorrect

The `ip ospf network point-to-point` command on interface G0/1 is used to establish a simple two-way adjacency between directly connected routers without the need for a Designated Router (DR) or Backup Designated Router (BDR) election. This simplifies OSPF neighbor discovery and can resolve adjacency issues that might arise from default broadcast network type behavior on what is essentially a point-to-point link.

Cip ospf network non-broadcast

`ip ospf network non-broadcast` is used for Non-Broadcast Multi-Access (NBMA) networks where neighbors must be statically configured, which is typically not the issue for basic adjacency problems on a direct link.

Dip ospf network point-to-multipoint

`ip ospf network point-to-multipoint` is also for NBMA networks and treats all neighbors as point-to-point, but `point-to-point` is simpler and more appropriate for a direct two-router connection.

Concept tested: OSPF Network Types Adjacency

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-mt/iro-15-mt-cr-book/iro-cf1.html

Topics

#OSPF#OSPF Network Types#OSPF Adjacency#Routing Protocol Troubleshooting

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