L3 access switches offer flexibility and scalability, but at a higher cost and greater configuration complexity compared to L2 models. The access layer plays a critical role in connecting end devices—such as computers, printers, IP phones, and wireless access points—to the rest of the enterprise network. This article. A Layer 3 switch (also called a multilayer switch) is a purpose-built hardware device that blends features of a traditional Layer 2 switch and a router. It plays a critical role in modern networks by performing high-speed packet forwarding while also making routing decisions at Layer 3. It contains three layers: core, distribution, and access. How Immunity fits A layered network in practice When an L2-only network is enough Why hardware routing beats a router here Resilience at the core Choosing L2 and L3 for your network Stacking and the access layer Multicast, QoS and other L3 work Migrating from a flat network Managing L2 and L3.
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