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The core, distribution, and access layers each have clearly defined
functions. For this reason, each layer demands a different set of
features from routers, switches, and links. Routers that operate in the
same layer can be configured in a consistent way because they all must
perform similar tasks. The router is the primary device that maintains
logical and physical hierarchy in a network. Therefore, proper and
consistent configurations are imperative. Cisco offers several router
product lines. Each product line has a particular set of features for one
of the three layers:
- Core layer – 12000, 7500, 7200, and 7000 series routers.
- Distribution layer – 4500, 4000, and 3600 series routers.
- Access layer – 2600, 2500, 1700, and 1600 series routers.
The following sections revisit each layer and examine the specific
routers and other devices used.
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Interactive Media Activity
Drag and Drop: Defining the Role of the Router in the Hierarchy
In this media activity, the student will identify the
functions of each hierarchy layer.

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