After the network is operating, baseline operational statistics should be gathered so that values for a working network are known. The network should then be monitored for anomalies and problems. If problems that require redesign occur, or if requirements change or are added, the appropriate design changes must be made and the entire design process should be repeated for that portion of the network. Monitoring and redesign take place in the PDIOO Operate and Optimize phases, and can lead back into the Plan and Design phases.
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