The PDIOO cycle describes all the phases of a network's life. The task of designing a network is obviously an integral part of this life cycle and influences all phases. For example, the implemen-tation phase might involve a prototype, which can help validate the design.

Network design should include the following tasks, as illustrated in Figure 1-3:

Determine requirements

Analyze the existing network, if one exists

Prepare the preliminary design

Complete the final design development

Deploy the network

Monitor, and redesign if necessary

Maintain documentation (as a part of all the other tasks)

Figure 1-3. Network Design Is an Ongoing Process

Figure 1-3. Network Design Is an Ongoing Process

These tasks, and their relationship to the PDIOO phases, are examined in the following sections.

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