What's the Internet: "nuts and bolts"view router r millions of connected workstation computing devices: hosts server mobile end-systems 投 al Is n pc s worksTations, servers m PDA's phones, toasters running network apps r communication links m fiber, copper, radio satellite r routers: forward packets (chunks )of data thru company network network 1: Introduction 21: Introduction 2 What’s the Internet: “nuts and bolts” view r millions of connected computing devices: hosts, end-systems m pc’s workstations, servers m PDA’s phones, toasters running network apps r communication links m fiber, copper, radio, satellite r routers: forward packets (chunks) of data thru network local ISP company network regional ISP router workstation server mobile