What is the name of the layer in the Cisco borderless switched network design that serves as the backbone for high-speed connectivity?

The core layer of the Cisco borderless switched network design serves as the backbone for high-speed connectivity. This layer is primarily responsible for transporting large amounts of data quickly and efficiently across the network. It connects multiple distribution layer devices and provides a pathway for data packets between them, ensuring low latency and high availability.

This layer is designed to handle high-speed traffic between various segments of the network and is optimized for minimal processing. Its high-speed switches facilitate quick delivery, which is crucial for applications that require real-time data transfers, such as voice and video services.

The distribution layer, while important for routing, filtering, and balancing traffic, operates above the core layer and does not serve as the primary backbone. The access layer is where end-user devices connect to the network, managing user access and control, and it does not have the same high-speed capabilities. The data link layer, referring to the second layer of the OSI model, is more about framing and error detection rather than the overarching structure of the network. Thus, the core layer is specifically designed to provide robust, high-speed connectivity necessary for efficient network operation.