Compared with a three-layer network architecture, a two-layer network architecture has simple topology and high data forwarding efficiency. The network architecture will transform to the two-layer architecture, and the three-layer network architecture will be gradually phased out.

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A three-layer network architecture, which includes core, distribution, and access layers, is often used for scalability and manageability in larger networks. While a two-layer architecture (collapsed core) can be simpler and more efficient for smaller networks, it does not necessarily mean that three-layer architectures will be phased out, as they are still beneficial for complex and large-scale networks.

Compared with a Three-Layer Network Architecture, a Two-Layer Network Architecture