Chapter 1. Introducing Cisco IOS XR


This chapter covers the following topics:


This chapter reviews the evolution of network operating systems (NOS), requirements for current and future networks, and how Cisco IOS XR meets these requirements. The first section of this chapter provides an overview of the evolution of networking. The second section outlines the requirements for a carrier-grade NOS that underpins a converged network with critical applications. The third section reviews basic concepts of operating systems. The final sections provide a high-level overview ...

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