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Zorluk: KolayOSPFv2 Network Types and DR/BDR Selection

An network engineer changes an Ethernet interface configuration to use the OSPFv2 Point-to-Point network type (`ip ospf network point-to-point`). Which two statements correctly describe the default operational characteristics of this OSPFv2 network type? (Select two.)

  1. OSPF suppresses Designated Router (DR) and Backup Designated Router (BDR) elections on the interface.Cevap
  2. OSPF neighbors are dynamically discovered using multicast Hello packets sent to 224.0.0.5.Cevap
  3. C
    An interface priority of 0 must be manually configured to prevent DR election on the link.
  4. D
    The interface defaults to a 30-second Hello timer and a 120-second Dead timer.
  5. E
    Neighbors must be statically configured using the neighbor command under the OSPF routing process.

Cevap

The OSPFv2 Point-to-Point network type automatically suppresses DR and BDR elections on the interface, and dynamically discovers adjacent neighbors using OSPF multicast messages sent to the AllSPFRouters address (224.0.0.5).
The OSPF Point-to-Point network type is designed specifically for two-router links. As a result, OSPF disables DR and BDR elections entirely, and neighbors dynamically discover each other via multicast sent to the AllSPFRouters address (224.0.0.5).

Adım Adım Çözüm

1
Analyze DR/BDR requirement for Point-to-Point network type
DR and BDR elections are unnecessary because only two endpoints exist on a point-to-point link.
Suppressing DR/BDR election reduces protocol overhead and simplifies adjacency establishment.
2
Determine neighbor discovery mechanism and timers
Neighbors are discovered automatically using 224.0.0.5 multicast with standard 10-second Hello and 40-second Dead timers.
Multicast capabilities are supported natively on Point-to-Point logical and physical interfaces.

Anahtar Kavram

OSPFv2 Point-to-Point Network Type Behavior
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