Routing Table Example

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Example of Directly Connected, Static, and Default Route Entries in a Routing Table

3 routers connected in a series:

• Consider routing table for router A:
  • router is directly connected to networks:
    • 10.0.1.0/24 (via interface G0)
    • 10.0.2.0/24 (via interface G1)
  • router has been configured with static routes to:
    • 10.0.3.0/24
    • 10.0.4.0/24
    • both are reachable via interface G1
• Router B is configured in same way, but
  • the networks 10.0.2.0/24 and 10.0.3.0/24 are directly connected
  • the paths to 10.0.1.0/24 and 10.0.4.0/24 are configured as static entries
• Router C is configured differently
  • it is directly connected to 10.0.3.0/24 and 10.0.4.0/24 but
    • the only static route configured is for 0.0.0.0/0
      • this is the default route
  • router has no specific knowledge of networks 10.0.1.0/24 and 10.0.2.0/24
    • but can forward packets for these destinations over its G0 interface