The Plan Design Implement Operate Optimize Pdioo Network Life Cycle

Cisco Systems teaches the Plan Design Implement Operate Optimize (PDIOO) set of phases for the life cycle of a network. It doesn't matter exactly which life cycle you use, as long as you realize that network design should be accomplished in a structured, planned, modular fashion, and that feedback from the users of the operational network should be fed back into new network projects to enhance or redesign the network. Learning the Cisco steps is important if you are studying for a Cisco design certification. For that reason, the steps are listed here:

• Plan. Network requirements are identified in this phase. This phase also includes an analysis of areas where the network will be installed and an identification of users who will require network services.

• Design. In this phase, the network designers accomplish the bulk of the logical and physical design, according to requirements gathered during the plan phase.

• Implement. After the design has been approved, implementation begins. The network is built according to the design specifications. Implementation also serves to verify the design.

• Operate. Operation is the final test of the effectiveness of the design. The network is monitored during this phase for performance problems and any faults, to provide input into the optimize phase of the network life cycle.

• Optimize. The optimize phase is based on proactive network management which identifies and resolves problems before network disruptions arise. The optimize phase may lead to a network redesign if too many problems arise due to design errors or as network performance degrades over time as actual use and capabilities diverge. Redesign may also be required when requirements change significantly. • Retire. When the network, or a part of the network, is out-of-date, it may be taken out of production. Although Retire is not incorporated into the name of the life cycle (PDIOO), it is nonetheless an important phase.

Figure 1-2 shows a graphical representation of the Cisco PDIOO network life cycle.

Figure 1-2. PDIOO Network Life Cycle

Figure 1-2. PDIOO Network Life Cycle

P Plan

D Design

I Implement

O Operate

O Optimize

R Retire

P Plan

D Design

I Implement

O Operate

O Optimize

R Retire

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