Building the Mobile Internet is the first guide to providing seamless, mobile Internet experiences across devices. Three of Cisco's leading experts systematically describe the pervasive computing technologies and protocols that are shaping the future of mobility. The authors first introduce the concept of Internet 'sessions,' explaining the relatively static nature of the Internet's original protocols and design. Next, they discuss the concept of 'mobility' itself, identify evolving mobility requirements, and discuss how mobility protocols are being integrated into existing Internet and cellular architectures. Finally, they present a layered approach that discusses each leading approach to mobility, including mechanisms, protocols, and relevant WiFi and cellular architectures.