Utilization of a hierarchical routing structure

How does the utilization of a hierarchical routing structure (that is, access, distribution, and core) allow a scalable delivery system?

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When a delivery system is not classified into access, distribution, and core layers, each and every point in the system requires maintaining every likely destination address to make a delivery decision. The utilization of a layered system signifies each layer requires only the information essential to deliver to the subsequent layer, either below or above.   

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