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CCNP Practical Studies: Troubleshooting by Donna L. Harrington

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Route Switch Technologies

Layer 3 switching is routing any way you look at it. Devices used to be more clearly defined—bridges and switches were Layer 2 hardware-based devices, and routers were Layer 3 devices that performed their operations in software. That is history. However, you may hear others talk about routing switches and switching routers.

Routing switches are more Layer 2–oriented with some upper-layer functionality. They use hardware to route, but generally don't run routing protocols. Switching routers are primarily Layer 3 devices that can also switch, and do run routing protocols. Either way, hardware application-specific integrated circuits (ASICs) are used for switching speed and performance. Routers are not as slow as they once ...

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