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Cisco Certified Network Associate (CCNA) · Cisco
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Cisco is very clear about the purpose of this layer. Its only role is to forward traffic, the fastest it can. Here you don’t apply any policy, as you must try to reduce the load of the core so it can focus on routing.
this layer is concerned with speed and ensures reliable delivery of packets.
In a three-tier architecture, the core layer is the central part of the network that provides high-speed switching and routing services to other network segments. The core layer is responsible for forwarding data between distribution layers and other network segments, and for ensuring efficient and reliable data transmission. The core layer is designed to be highly available, scalable, and redundant, and typically uses high-speed network switches and routers. The core layer provides the backbone for the network, and is critical to the overall performance and reliability of the system. It is usually placed at the center of the network, and is optimized for speed and low latency to provide high-speed connectivity between the distribution layers. The core layer also provides a centralized point for network management and monitoring.