What does the term "Collapsed Backbone" refer to in network design?

The term "Collapsed Backbone" refers to a design that combines core and distribution layers for simplicity. In traditional network architecture, these layers are separate; the core layer is responsible for high-speed data transfer across different locations, while the distribution layer connects access switches to the core. By collapsing these layers into one, the network design becomes streamlined and reduces complexity. This allows for improved communication and efficiency within the data center, as fewer devices are needed, and there is a reduction in the number of interconnections that require management.

This design choice can be particularly beneficial in smaller or medium-sized data centers, where the space, resources, and financial constraints make maintaining separate layers less practical. It enhances manageability and performance by minimizing latency and potential bottlenecks found in more layered approaches while maintaining sufficient bandwidth and reliability for data transfer.