Key Point

A module is a component of a composite structure. Modular network design involves creating modules that can then be put together to meet the requirements of the entire network.

Modules are analogous to building blocks of different shapes and sizes; when creating a building, each block has different functions. Designing one of these blocks is a much easier task than designing the entire building. Each block might be used in multiple places, saving time and effort in the overall design and building process. The blocks have standard interfaces to each other so that they fit together easily. If the requirements for a block change, only that block needs to changeother blocks are not affected. Similarly, a specific block can be removed or added without affecting other blocks.

As when used for a building, a modular design for a network has many benefits, including the following:

• It is easier to understand and design smaller, simpler modules rather than an entire network.

• It is easier to troubleshoot smaller elements compared to the entire network.

• The reuse of blocks saves design time and effort, as well as implementation time and effort.

• The reuse of blocks allows the network to grow more easily, providing network scalability.

• It is easier to change modules rather than the entire network, providing flexibility of design.

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