What's the Internet:a service view >mobile network Infrastructure that provides services to global ISP applications: Web,VolP,email,games, home e-commerce,social network nets,... regional ISP provides programming interface to apps hooks that allow sending and receiving app programs to“connect”to Internet institutional network provides service options, analogous to postal Introduction 1-7 service What’s the Internet: a service view  Infrastructure that provides services to applications:  Web, VoIP, email, games, e-commerce, social nets, …  provides programming interface to apps  hooks that allow sending and receiving app programs to “connect” to Internet  provides service options, analogous to postal service mobile network global ISP regional ISP home network institutional network Introduction 1-7