access, distribution, and core layers collapsed into one tier, with a separate backbone layer
access and distribution layers collapsed into one tier, and the core layer on a separate tier
access and core layers collapsed into one tier, and the distribution layer on a separate tier
distribution and core layers collapsed into one tier, and the access layer on a separate tier
access, distribution, and core layers collapsed into one tier, with a separate backbone layeraccess and distribution layers collapsed into one tier, and the core layer on a separate tieraccess and core layers collapsed into one tier, and the distribution layer on a separate tierdistribution and core layers collapsed into one tier, and the access layer on a separate tier
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