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The core layer is the backbone of the campus
switched network. The switches in this layer can make use of a number of
Layer 2 technologies. Provided that the distance between the core layer
switches is not too great, the switches can use Ethernet technology. Other
Layer 2 technologies, such as Asynchronous Transfer Mode (ATM) cell
switching, can also be used. In a network design, the core layer can be a
routed, or Layer 3, core. Core layer switches are designed to provide
efficient Layer 3 functionality when needed. Factors such as need, cost, and
performance should be considered before a choice is made.
The following Cisco switches are suitable for the core layer:
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Catalyst 6500 series
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Catalyst 8500 series
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IGX 8400 series
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Lightstream 1010
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