This chapter begins with an introduction to the Cisco vision of intelligent networks and the Service Oriented Network Architecture (SONA) architectural framework. The lifecycle of a network and a network design methodology based on the lifecycle are presented. Each phase of the network design process is explored in detail, starting with how to identify customer requirements, including organizational and technical goals and constraints. Because many customers build on an existing network and at existing sites, this chapter also presents methods of characterizing that existing network and those sites. A top-down approach to design and structured design principles is presented. The design process includes a discussion about building a prototype or pilot and the appropriate content of a design specification. The chapter concludes with a discussion of the design implementation process.
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