COMPUTER NETWORKS Hwajung Lee. What is Computer Networks? A collection of autonomous computers interconnected by a single or multiple technologies Interconnected.

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Presentation transcript:

COMPUTER NETWORKS Hwajung Lee

What is Computer Networks? A collection of autonomous computers interconnected by a single or multiple technologies Interconnected via: Copper wire Fiber optics Microwaves Infrared Communication satellites, etc. Image Source:

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What is a protocol? Image Source: Communications between computers requires very specific unambiguous rules A protocol is a set of rules that governs how two or more communicating parties are to interact Internet Protocol (IP) Transmission Control Protocol (TCP) HyperText Transfer Protocol (HTTP) Simple Mail Transfer Protocol (SMTP)

What is a communication network? The equipment (hardware & software) and facilities that provide the basic communication service Virtually invisible to the user; Usually represented by a cloud Equipment Routers, servers, switches, multiplexers, hubs, modems, … Facilities Copper wires, coaxial cables, optical fiber Ducts, conduits, telephone poles … How are communication networks designed and operated? Image Source:

History of Internet Image Source:

History of Cellphones Image Source:

Classification of interconnected processors by scale. Image Source:

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Network Architecture Evolution Telegraph networks Telephone networks Internet, Optical & Wireless networks Information transfer per second (bits/second) Next Generation Internet ?

Image Source: Example: Amazon EchoAmazon Echo

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Image Source: Image Source: More Works with Networks and SensorsNetworks and Sensors