sasa.pptx

What’s the Internet: “nuts and bolts” view PC server wireless laptop millions of connected computing devices: hosts = end systems running network apps mobile network global ISP smartphone  communication wireless links wired links home network links  fiber, copper, radio, satellite  transmission r...

What’s the Internet: “nuts and bolts” view PC server wireless laptop millions of connected computing devices: hosts = end systems running network apps mobile network global ISP smartphone  communication wireless links wired links home network links  fiber, copper, radio, satellite  transmission rate: bandwidth  Packet router switches: forward packets (chunks of data)  routers and regional ISP institutional network 1-2 What’s the Internet: “nuts and bolts” view Internet: “network of networks” mobile network global ISP Interconnected ISPs protocols control sending, receiving of msgs e.g., TCP, IP, HTTP, Skype, 802.11 home network regional ISP Internet standards RFC: Request for comments IETF: Internet Engineering Task Force institutional network 1-3 What’s the Internet: a service view Infrastructure that provides services to applications: mobile network global ISP Web, VoIP, email, games, ecommerce, social nets, … provides programming interface to apps home network regional ISP hooks that allow sending and receiving app programs to “connect” to Internet provides service options, analogous to postal service institutional network 1-4