C021TV-I4-S4 Nom abrégé de cours - Enseignant.

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C021TV-I4-S4 Nom abrégé de cours - Enseignant

ICN : 4. Computer and networks architecure 1. Elementary components of a computer 2. Computer programs execution principle 3. Data transmission principle 4. Network structuring Introduction de la semaine 2/2 Présentation du sommaire global de la semaine : apparition progressive des éléments de la liste, puis mise en évidence de la portion concernée par la vidéo. Mise en évidence = police noire + gras Nom abrégé de cours - Enseignant

From printers to local networks Point to point connexion between computer and peripheral Printer, scanner, … Need of interconnecting several computers Without multipying wires Ring network then Bus network Without having the various exchanges collide Transmissions divided in packets

Local networks

Graph underlying strucutre Internet InterNetworking Interconnecting numerous local networks Graph underlying strucutre

Billions of interconnected equipment Identify in a unique way each connectedf equipment Allow data flow to pass through the Internet Protocol created for adressing and routing IP (Internet Protocol) Transition from IPv4 to IPv6 in progress Additionary protocols to facilitate communications TCP for reliable communications, …

Identify equipment How to know an IP address? Some equipments are charged with handing addresses to their neighbours Internet box, company servers, … What about far away equipment? Visit a Web site, send an email, … Who is www.fun-mooc.fr ? IP address 195.83.147.71 DNS (Domain Name System) to convert names and addresses Servers dedicated to these translations

Routing through the Internet

Routing through the Internet To reach a Web server, the browser must go through the box, then through lots of intermediaries on the planet Routers Each intermediary has a routing table indicating who the request must be handed to No unique path between transmitter and receiver Choose according to failures, shutdowns, slow downs, or even ecording to costs Imperceptible Step by step routing

What you need to remember Computers, smartphones, … are connected through local networks, them in turn interconnected by Internet A huge graph Protocols to identify the numerous equipments A paths to find to have data flowing between them