What is modularity in network design?

Modularity in network design refers to the practice of dividing the network into smaller, independent, and interchangeable components or sections. This approach simplifies design, implementation, and troubleshooting because changes in one module are less likely to affect others. For example, a campus network might have distinct modules for access, distribution, and core layers, or for different buildings. The incorrect options describe related but distinct concepts: "ability to bundle several functions into a single layer of the network" relates to network layering or convergence, not modularity itself. "Ability to self-heal the network to prevent service outages" describes network resiliency or high availability. "Ability to scale and accommodate future needs of the network" describes scalability, which is often enabled by modular design but isn't the definition of modularity.