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It’s quite common to see a purely switched network design broken into three layers—the core, the distribution, and the access—and the design called “hierarchical.” This concept of breaking a network into different pieces and simply calling those pieces different things, based on their function alone, removes one of the crucial pieces of hierarchical design theory: information hiding.


Cover of The Art of Network Architecture: Business-Driven Design


infromation hidding is needed to make hierarchical desings not only separate the diveces by role