The hierarchical LAN design model — access, distribution, core — provides:
Scalability through structured hierarchy (A).
Easier change management and staged deployments since functions are isolated at each layer (E).
CCDE v3.1 emphasizes hierarchy for long-term scalability, manageability, and operational stability.
Why other options are incorrect:
B: Modern data centers favor spine-leaf over traditional hierarchy.
C: The model simplifies rather than complicates.
D: Simplification is not its primary advantage — scalability and modularity are.
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