A Simple Example (cont)

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Connected: An Internet Encyclopedia
A Simple Example (cont)

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A Simple Example (cont) Within Einstein Hall, there are several computer laboratories. The address prefix can be subnetted further. Assuming there are no more than 30 computers in each lab, 27 bit prefixes can be used. 10.10.1.0/27 will be used by Newton Lab, 10.10.1.32/27 by Faraday Lab, etc.

Consider packet for another university addressed to 10.10.1.20. First, routers outside this campus would match the packet's address against 10.10/16 and directed it towards the university. Having reached a campus router, the address would then be matched against 10.10.1/24 and be forwarded towards Einstein Hall. Having reached a router within the building, a match against 10.10.1.0/27 would point to routers attached to Newton Lab. Finally, a router directly connected to the Newton Lab Ethernet would determine 10.10.1.20's Ethernet address and deliver the packet to its final destination.

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Connected: An Internet Encyclopedia
A Simple Example (cont)