In a 3-tier network architecture, the Core Layer serves as the high-speed backbone of the network. Its primary role is to transport large volumes of data quickly and reliably between different parts of the network, typically connecting multiple distribution layers or data centers. Unlike the access or distribution layers, the core is optimized for speed, redundancy, and minimal latency, rather than policy enforcement or packet filtering. It is designed for maximum performance and fault tolerance, ensuring uninterrupted connectivity and efficient routing of traffic across the enterprise network. This layer is critical for maintaining the overall scalability and resilience of large and complex IT infrastructures.