What's the Internet:"nuts and bolts"view millions of connected router computing devices:hosts workstation end systems 目server mobile running network apps ocal ISP communication links fiber,copper,radio, satellite … transmission rate bandwidth 口 routers:forward packets (chunks of data) company (CD network Introduction 1-4Introduction 1-4 What’s the Internet: “nuts and bolts” view q millions of connected computing devices: hosts = end systems q running network apps q communication links v fiber, copper, radio, satellite v transmission rate = bandwidth q routers: forward packets (chunks of data) local ISP company network regional ISP router workstation server mobile