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1.1, Module 1:Single-Area OSPFv2 Concepts, image, image, image, image -…

- - - - Routers running OSPF exchange messages to convey routing information
    - - OSPF messages are used to create and maintain three OSPF databases, as follows
        
        Link-state database (LSDB)
        
        Adjacency database
        
        Link-state database (LSDB)
    - - The SPF algorithm creates an SPF tree by placing each router at the root of the tree and calculating the shortest path to each node
- - - - Exchange Link-State Advertisements
      - Build the Link State Database
      - Execute the SPF Algorithm
      - Choose the Best Route
      - Establish Neighbor Adjacencies
- - - - Each packet serves a specific purpose in the OSPF routing process
        
        Type 1: Hello packet -
        
        Type 2: Database Description (DBD) packet -
        
        Type 3: Link-State Request (LSR) packet -
        
        Type 4: Link-State Update (LSU) packet -
        
        Type 5: Link-State Acknowledgment (LSAck) packet -
- - - - it attempts to:
        
        Create adjacencies with neighbors
        
        Exchange routing information
        
        Calculate the best routes
        
        Reach convergence
  - - - 1.Down State to Init State2.The Init State3.Two-Way State4.Elect the DR and BDR
  - - - This is a three step process, as follows:
        
        Decide first router
        
        Exchange DBDs
        
        Send an LSR
  - - - Extensive flooding of LSAs