Router Operation with Subnet Mask
Router ...
- Receives IP packet (128.171.17.13)
- Applies subnet mask (255.255.255.0)
- Gets result (128.171.17.0)
- Also applies subnet mask to its own addresses (one on each subnet)
- Gets: 128.171.1.0, 128.171.17.0
- There is a match (128.171.17.0)
- Router delivers to host on that network