Information hiding

Question

What does the word information hiding signifies in relation to route summarization?

Answer 1

At core layer in the postal system, the only information which is required to make a routing decision is the state or city or state information. The particular street names and street numbers are hidden; the core layer does not require this information. At core layer in the telephone system, the area code is employed to make a routing decision. The particular exchange or last four digits of the phone number are not required, or hidden, from the core layer.