Ciclo de vida de un diseño

An overview of the design process
The life cycle of a design

Network designs are predominantly living entities; they rarely stay the same. Even from inception to initial implementation, a designwill often change. The point at which a network is installed often marks the start of a new phase of design rather than the end of the process. Consequently, it is useful to think of network design asa cyclic process, as illustrated in Figure 1.1. Before the design process can begin, a clear set of requirements should be established to capture what the organization and its users expect from thenetwork and the services to be offered. The requirements should also clearly identify what the budget is and any other constraints that impact the design. The network design process then naturallyfollows a set sequence:

* Information gathering
* Planning
* Implementation
* Acceptance
* Expansion and modification

Just as with any living organism, networks have a limitedlife span, becoming increasingly nreliable, inflexible, and unable to cope with the pressures placed on them. Advances in network technology and increases in overall traffic levels render most technologyobsolete within a few short years. The lifetime of a network may be extended with the aid of transplants
to vital organs (upgrading routers, links, etc.); however, there generally comes a pointwhere the network design itself requires a major overhaul, often resulting in total replacement (at which point the cycle starts over).

Since networks are becoming increasingly inseparable from theorganizations, a dynamic organization can put severe strain on a design, forcing radical changes over a much shorter time than a more stable organization. As companies expand and diverge, merge withother companies, and change their product focus and distribution methods, so too must the network.
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