Core: High-speed backbone, routing between sites., WAN aggregation router, Internet gateway router, A technician configures data center routers for fast site-to-site traffic., Provides fast, reliable routing for the entire enterprise network., Handles WAN connections and site-to-site traffic., Routers that connect multiple buildings or campuses, Distribution: Aggregates access switches, enforces policies., Layer 3 switch, Firewall / VPN concentrator, Policy enforcement router, Handles routing, QoS, and security between access layer switches., Connects multiple access switches and enforces network policies, Provides redundancy and high availability between access switches, Access: Connects end devices to the network., Wireless access point, VoIP phone switch port, Printer / workstation connection, A technician is plugging end devices into switches., Devices like office PCs and phones connect here, Handles user access and port-level policies., 3-Tier Hierarchy Model: Simplifies troubleshooting, Enhances security, Core, Distribution, Access layers, Improves scalability and performance, Standard in enterprise networks, Reduces congestion and separates network functions,

Network+ 3-Tier Hierarchy Model

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