pter 8 Network Data and Optimization Mazin Gilbert and Mark Austin Chapter 9 Network Security Rita Marty and Brian Rexroad Chapter 10 Enterprise Networks Michael Satterlee and John Gibbons Chapter 11 Network Access Hank Kafka Contents Chapter 12 Network Edge Ken Duell and Chris Chase Chapter 13 Network Core John Paggi Chapter 14 Service Platforms Paul Greendyk, Anisa Parikh, and Satyendra Tripathi Chapter 15 Network Operations Irene Shannon and Jennifer Yates Chapter 16 Network Measurements Raj Savoor and Kathleen Meier-Hellstern Chapter 17 The Shift to Software Toby Ford Chapter 18 What's Next? Jenifer Robertson and Chris Parsons Index Foreword It's easy to forget just how thoroughly mobile connectivity has changed our relationship with technology. Any new piece of hardware is judged not just for the processor, memory, or camera it contains but for how well it connects. Wi-Fi, fiber, 4G-and soon 5G-have become the new benchmarks by which we measure technological progress. In many ways, this era of high-speed connectivity is a lot like the dawn of the railroads or the superhighways in the nineteenth and twentieth centuries, respectively. Like those massive infra- structure projects, connectivity is redefining society. And it is bringing capabilities and knowledge to all facets of society, enabling a new era of collaboration, innovation, and entertainment. Yet most people take networks for granted because SO much of what happens on them is hidden from view. When we use our phones or tablets or stream video to our connected cars, we expect the experience to be simple and seamless. The last thing we should care about is how they are con- necting or onto what networks. And all the while we continue to place ever-heavier loads on these networks, which now include 4K video and virtual reality. Keeping up with these demand curves is a monumental task. In fact, knowing how to manage, secure, transport, and analyze these oceans of data might be the single greatest logistical challenge of the twenty-first century. Needless