OSPF - OSPF Fundamentals

5 important questions on OSPF - OSPF Fundamentals

What are the Multicast IP and Multicast MAC addresses used by OSPF?

AllSPFRouters: 224.0.0.5 / 01:00:5E:00:00:05
AllDRouters : 224.0.0.6 / 01:00:5E:00:00:06

What are the 5 packet types of OSPF?

  1. Hello Packet
  2. DataBase Descriptor Packet (DBD)
  3. Link-State Request (LSR)
  4. Link-State Update (LSU)
  5. Link-State Acknowledgement (LSA)

Which fields are in the OSPF Hello packet?

  1. Router ID
  2. Authentication Options
  3. Area ID
  4. Interface Address / Mask
  5. Interface Priority
  6. Hello Interval
  7. Dead Interval
  8. DR and BDR
  9. Active Neighbors
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What are the OSPF Neighbor states?

Down
(Attempt)
Init (Hello received)
2-Way (Bidirectional com established, DR/BDR elected)
ExStart (Master/Slave election for LSDB Sync)
Exchange (Exchanging links states using DBDs)
Loading (LSR packets are exchanged)
Full

For OSPF routers, which requirements must be met for a Neighbor Adjacency to form?

  1. Unique Router IDs
  2. Interfaces on the same subnet
  3. MTU must match
  4. Area ID must match for segment
  5. Need for DR must match
  6. Hello and Dead timers must match
  7. Auth type and credentials must match
  8. Area type flags must match

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