1 Ram Dantu University of North Texas, Practical Networking.

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1 Ram Dantu University of North Texas, Practical Networking

2 Agenda r Nuts and Bolts of Internet r Access, Edge, and Core Networks r LAN Design r End-user Protocols, Services and QoS r Edge and Core Networks r Performance m Bandwidth and Delay r Security

3 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

4 What’s the Internet: “nuts and bolts” view r protocols: control sending, receiving of msgs m e.g., TCP, IP, HTTP, FTP, PPP r Internet: “network of networks” m loosely hierarchical m public Internet versus private intranet r Internet standards m RFC: Request for comments m IETF: Internet Engineering Task Force local ISP company network regional ISP router workstation server mobile

5 What’s the Internet: a service view r communication infrastructure enables distributed applications: m WWW, , games, e- commerce, database., voting, m more? r communication services provided: m connectionless m connection-oriented r cyberspace [Gibson]: “a consensual hallucination experienced daily by billions of operators, in every nation,...."

6 A closer look at network structure: r network edge: applications and hosts r network core: m routers m network of networks r access networks, physical media: communication links