In this chapter you learned about the principles of network design, with a focus on the following topics:
■ The three phases of the Cisco SONA architectural framework: integrated transport, services, and applications
■ The three layers of the Cisco SONA architectural framework: networked infrastructure, interactive (infrastructure) services, and application
■ The PPDIOO network lifecycle
■ The network design methodology based on this lifecycle, which has three basic steps:
— Identify customer requirements
— Characterize the existing network and sites
— Design the network topology
■ The design implementation process, which also has three basic steps:
— Plan the implementation
— Implement and verify the design
— Monitor and optionally redesign
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