Longest Match Rule

• Allows a router to determine the best route based on granularity of the masked address.

• Used when a network ID is found to match more than one subnet mask.

• Example:

  • Received datagram of 200.40.1.1
  • Route table lookup found two entries:
    • 200.40.1.0/24
    • 200.40.0.0/16
  • Route would use the 200.40.1.0/24

• Must be careful when assigning addresses.

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