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Cisco A Beginner's Guide, Fifth Edition, 5th Edition by Anthony Velte, Toby Velte

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CHAPTER 3 Cisco Certifications
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The ubiquity of internetworking has created a need for more technical talent to install and manage network infrastructure. Industry growth is the biggest factor. The number—and capabilities—of installed routers, switches, and other internetworking devices has grown explosively over the last two decades, and more qualified technicians are needed to take care of them. But industry growth isn’t the only factor ...

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