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Software Defined Networking by James M. Anderson, Patricia A. Morreale

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Chapter 1

Virtualization

1.1 Introduction

Virtualization has been an integral part of computing since distributed computing began. Users were initially provided with virtual resources, which were effectively logical subdivisions of a single shared device or devices. The concept of virtualization provided individual, dedicated resources from a larger common pool of resources and provided users with the desired customization and control. The field of virtualization expanded in part because of the limitations of shared resources. Although virtualization has been used since distributed computing started, the integration of virtualization and networking, the heart of software-defined networking (SDN), has been driven and enabled by reductions in ...

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