Top-down network design is a methodology for designing networks that begins at the upper layers of the OSI reference model before moving to the lower layers. It focuses on applications, sessions, and data transport before the selection of routers, switches, and media that operate at the lower layers.

What is top down network design vs structured network design process?

The top-down approach adapts the physical infrastructure to the needs of the applications. Network devices are chosen only after a thorough requirements analysis. Structured design practices should be integrated with the top-down approach, especially in very complex networks.

What is network design methodology?

The network design methodology presented in this section is derived from the Cisco Prepare, Plan, Design, Implement, Operate, and Optimize (PPDIOO) methodology, which reflects a network’s lifecycle. … The output of this phase is a set of network requirements.