CCNA focuses on networks for SMBs (small, medium businesses). A hierarchical design model is recommended. Easier to manage and expand. Problems are solved more quickly. Hierarchical design divides the network into 3 layers. Core, (CL). Distribrution, (DL). Access, (AL). Each layer provides specific functions. This "modularity" facilitates scalability and performance.
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LAN Design and the Hierarchical Network Model
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