A 3-tier networking architecture is a hierarchical model used to design and organize complex IT networks, typically structured into three layers: the Core, Distribution, and Access tiers. The Access Layer connects end devices like computers, printers, and wireless access points to the network. The Distribution Layer acts as an intermediary, enforcing policies, routing, and managing traffic between the access and core layers. At the top, the Core Layer provides high-speed, reliable backbone connectivity, ensuring efficient data transport across the network. This modular approach enhances scalability, improves performance, simplifies troubleshooting, and supports more secure and manageable network environments—making it ideal for enterprise and data center networks.