Network design can be defined as the philosophy that drives how various components, protocols, and technologies should be included and deployed based on particular approaches and principles to put together a cohesive network infrastructure environment that could facilitate the development of tactical or strategic business aims. Earlier sections in this chapter described the end-to-end process of a network design and the approaches that you can use to sort out different network designs. This ccde practical workbook nonetheless, is targeted on the design principles that network designers must think about when designing a network as well as translating business, functional, or even application requirements into technological requirements. It is important to understand that these principles are not self-sufficient of each other. Consequently, to generate a highly effective design as well as achieve its proposed goals, network designers must think of how each of these principles may integrate into the overall architecture; however, not all of these principles may be applicable or required by any specific design. By following the top-down approach, network designers can analyze and decide what to think about and focus on.
Modular design is often used in software development, where a software application can be built from multiple blocks of codes that collectively integrate to form the desired application. These ccde lab workbook of modular structure enhance and simplify the all round application architecture. For example, if an issue exists in one block or even module of that software program, it can easily be separated from the other modules and repaired separately without impacting other parts. Furthermore, from the perspective of ongoing enhancements, it is easier to add additional modules or blocks to this structure if new features are required. This will make the overall application architecture more structured and manageable. Likewise, modularity is one of the fundamental concepts of a structured network. In a structured system, the network architecture can be split up into multiple functional modules, with each module serving a specific role in the network and represented by an individual physical network. The individual physical network is also referred to as the places in the network, such as the enterprise campus, WAN, or even the data center.
Designing for scalability is among the most important facets that a ccde workbook should consider. The fact is, what can be considered as a successful scalable network is not only measured by the network size factor but also by how stable and reliable the network is and how conveniently this network can be managed and troubleshot. For example, a network could very well be designed in a way that can grow to thousands of routers, but simultaneously, a failure in one link or unit can introduce a high degree of processing and CPU utilization across the network, which may lead to instability. This design cannot be considered a successful scalable design, although it can grow to a large number of routers. Similarly, a network may be built to grow to a large scale while equally being difficult to manage and also troubleshoot, with any problem potentially taking a long time to be fixed. This network cannot be considered a successful scalable design either.
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