{"id":1538,"date":"2025-06-25T17:50:06","date_gmt":"2025-06-25T16:50:06","guid":{"rendered":"https:\/\/workboot.fr\/ciela\/?page_id=1538"},"modified":"2025-07-12T16:14:43","modified_gmt":"2025-07-12T15:14:43","slug":"modele-osi","status":"publish","type":"page","link":"https:\/\/workboot.fr\/ciela\/modele-osi\/","title":{"rendered":"Mod\u00e8le OSI"},"content":{"rendered":"\n<nav aria-label=\"Table des mati\u00e8res\" class=\"wp-block-table-of-contents\"><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/modele-osi\/#les-7-couches-du-modele-osi-du-haut-vers-le-bas\">\ud83d\udcda Les 7 couches du mod\u00e8le OSI (du haut vers le bas)<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/modele-osi\/#comment-ca-fonctionne\">\ud83d\udd04 Comment \u00e7a fonctionne ?<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/modele-osi\/#situation\">\ud83d\udc64 Situation :<\/a><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/modele-osi\/#7-application\">\ud83d\udfe3 7. Application<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/modele-osi\/#6-presentation\">\ud83d\udd35 6. Pr\u00e9sentation<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/modele-osi\/#5-session\">\ud83d\udfe2 5. Session<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/modele-osi\/#4-transport\">\ud83d\udfe1 4. Transport<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/modele-osi\/#3-reseau\">\ud83d\udfe0 3. R\u00e9seau<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/modele-osi\/#2-liaison-de-donnees\">\ud83d\udd34 2. Liaison de donn\u00e9es<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/modele-osi\/#1-physique\">\u26ab 1. Physique<\/a><\/li><\/ol><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/modele-osi\/#et-cote-serveur-wikipedia\">\ud83d\udd01 Et c\u00f4t\u00e9 serveur (Wikip\u00e9dia) ?<\/a><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/modele-osi\/#en-resume-simplifie\">\ud83e\udde0 En r\u00e9sum\u00e9 (simplifi\u00e9) :<\/a><\/li><\/ol><\/li><\/ol><\/nav>\n\n\n\n<p class=\"wp-block-paragraph\">Le <strong>mod\u00e8le OSI<\/strong> (Open Systems Interconnection) est un <strong>mod\u00e8le th\u00e9orique<\/strong> qui d\u00e9crit <strong>comment les donn\u00e9es circulent dans un r\u00e9seau informatique<\/strong>, depuis une application jusqu\u2019au r\u00e9seau physique, et inversement. Il est structur\u00e9 en <strong>7 couches<\/strong>, chacune ayant un r\u00f4le sp\u00e9cifique.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"les-7-couches-du-modele-osi-du-haut-vers-le-bas\">\ud83d\udcda Les 7 couches du mod\u00e8le OSI (du haut vers le bas)<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>N\u00b0<\/th><th>Nom de la couche<\/th><th>Fonction principale<\/th><th>Exemple concret<\/th><\/tr><\/thead><tbody><tr><td>7<\/td><td>\ud83d\udfe3 <strong>Application<\/strong><\/td><td>Interface utilisateur et logiciels r\u00e9seau<\/td><td>HTTP, FTP, SMTP, DNS<\/td><\/tr><tr><td>6<\/td><td>\ud83d\udd35 <strong>Pr\u00e9sentation<\/strong><\/td><td>Format des donn\u00e9es, cryptage, compression<\/td><td>SSL\/TLS, encodage JPEG\/ASCII<\/td><\/tr><tr><td>5<\/td><td>\ud83d\udfe2 <strong>Session<\/strong><\/td><td>Gestion des connexions et sessions<\/td><td>RPC, NetBIOS, gestion login\/logout<\/td><\/tr><tr><td>4<\/td><td>\ud83d\udfe1 <strong>Transport<\/strong><\/td><td>Fiabilit\u00e9, segmentation, contr\u00f4le d\u2019erreurs<\/td><td>TCP, UDP<\/td><\/tr><tr><td>3<\/td><td>\ud83d\udfe0 <strong>R\u00e9seau<\/strong><\/td><td>Adressage logique et routage<\/td><td>IP, ICMP, OSPF<\/td><\/tr><tr><td>2<\/td><td>\ud83d\udd34 <strong>Liaison de donn\u00e9es<\/strong><\/td><td>Adressage physique (MAC), d\u00e9tection d\u2019erreurs<\/td><td>Ethernet, PPP, Wi-Fi (niveau MAC)<\/td><\/tr><tr><td>1<\/td><td>\u26ab <strong>Physique<\/strong><\/td><td>Transmission binaire sur le support<\/td><td>C\u00e2ble RJ45, fibre optique, ondes radio<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"comment-ca-fonctionne\">\ud83d\udd04 Comment \u00e7a fonctionne ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Prenons un exemple simple : <strong>tu envoies un message via WhatsApp<\/strong>.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Application (7)<\/strong> : Tu \u00e9cris ton message \u2192 l&rsquo;appli utilise un protocole r\u00e9seau.<\/li>\n\n\n\n<li><strong>Pr\u00e9sentation (6)<\/strong> : Le message est peut-\u00eatre compress\u00e9 ou chiffr\u00e9 (SSL).<\/li>\n\n\n\n<li><strong>Session (5)<\/strong> : WhatsApp g\u00e8re une session pour maintenir la connexion avec le serveur.<\/li>\n\n\n\n<li><strong>Transport (4)<\/strong> : Les donn\u00e9es sont d\u00e9coup\u00e9es en petits segments (via TCP).<\/li>\n\n\n\n<li><strong>R\u00e9seau (3)<\/strong> : Chaque segment re\u00e7oit une adresse IP source\/destination.<\/li>\n\n\n\n<li><strong>Liaison (2)<\/strong> : Ces paquets sont transform\u00e9s en trames avec adresses MAC.<\/li>\n\n\n\n<li><strong>Physique (1)<\/strong> : Les bits sont envoy\u00e9s sur le c\u00e2ble Wi-Fi ou 4G.<\/li>\n<\/ol>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">Quand les donn\u00e9es arrivent \u00e0 destination, le processus est invers\u00e9 (d\u00e9-encapsulation).<\/p>\n<\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code>+---------------------+   \u2190 7. Application\n|  Appli r\u00e9seau       |   \u2190 Ex: HTTP, WhatsApp\n+---------------------+\n|  Pr\u00e9sentation       |   \u2190 Encodage, chiffrement\n+---------------------+\n|  Session            |   \u2190 Gestion des connexions\n+---------------------+\n|  Transport          |   \u2190 TCP\/UDP, ports, fiabilit\u00e9\n+---------------------+\n|  R\u00e9seau             |   \u2190 IP, routage, adresses IP\n+---------------------+\n|  Liaison de donn\u00e9es |   \u2190 MAC, trames, erreurs\n+---------------------+\n|  Physique           |   \u2190 C\u00e2ble, signaux, bits\n+---------------------+\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Alice va consulter le site wiipedia<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"situation\">\ud83d\udc64 Situation :<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">L&rsquo;utilisateur <strong>Alice<\/strong> ouvre <strong>Google Chrome<\/strong> et tape <code>https:\/\/fr.wikipedia.org<\/code> dans la barre d&rsquo;adresse.<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"7-application\">\ud83d\udfe3 7. <strong>Application<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ce que voit l\u2019utilisateur<\/strong> : le site web.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Le navigateur utilise le <strong>protocole HTTPS<\/strong> (HTTP s\u00e9curis\u00e9) pour demander une page \u00e0 un serveur.<\/li>\n\n\n\n<li>Alice demande : \u00ab Donne-moi la page d&rsquo;accueil de Wikip\u00e9dia en fran\u00e7ais \u00bb.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"6-presentation\">\ud83d\udd35 6. <strong>Pr\u00e9sentation<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>R\u00f4le : Format, chiffrement, d\u00e9chiffrement<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Les donn\u00e9es sont <strong>chiffr\u00e9es avec TLS\/SSL<\/strong> pour s\u00e9curiser la communication.<\/li>\n\n\n\n<li>Le certificat de s\u00e9curit\u00e9 de Wikip\u00e9dia est v\u00e9rifi\u00e9 pour \u00e9tablir une connexion s\u00e9curis\u00e9e.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"5-session\">\ud83d\udfe2 5. <strong>Session<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>R\u00f4le : Gestion de la session entre le client et le serveur<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Une session est ouverte entre le navigateur et le serveur web.<\/li>\n\n\n\n<li>Le navigateur et le serveur se mettent d\u2019accord sur des param\u00e8tres de communication (cl\u00e9 de chiffrement, dur\u00e9e de session, etc.).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-transport\">\ud83d\udfe1 4. <strong>Transport<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>R\u00f4le : Transmission fiable des donn\u00e9es<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Le protocole <strong>TCP<\/strong> d\u00e9coupe la requ\u00eate en petits segments, num\u00e9rot\u00e9s.<\/li>\n\n\n\n<li>Il garantit que les segments arrivent bien et dans le bon ordre.<\/li>\n\n\n\n<li>Si un segment est perdu, il est <strong>renvoy\u00e9 automatiquement<\/strong>.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-reseau\">\ud83d\udfe0 3. <strong>R\u00e9seau<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>R\u00f4le : Routage IP<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Chaque segment re\u00e7oit une <strong>adresse IP source<\/strong> (Alice) et <strong>destination<\/strong> (serveur Wikip\u00e9dia).<\/li>\n\n\n\n<li>Le r\u00e9seau Internet (les routeurs) <strong>achemine les paquets IP<\/strong> jusqu&rsquo;au serveur de Wikip\u00e9dia.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-liaison-de-donnees\">\ud83d\udd34 2. <strong>Liaison de donn\u00e9es<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>R\u00f4le : Communication locale sur le r\u00e9seau<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Le paquet IP est encapsul\u00e9 dans une <strong>trame Ethernet<\/strong> (ou Wi-Fi).<\/li>\n\n\n\n<li>Il contient l\u2019adresse <strong>MAC<\/strong> de l\u2019ordinateur d\u2019Alice et celle du routeur de son FAI.<\/li>\n\n\n\n<li>Cette trame circule sur le r\u00e9seau local (Wi-Fi ou c\u00e2ble).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-physique\">\u26ab 1. <strong>Physique<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>R\u00f4le : Transmission des bits<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Les donn\u00e9es (sous forme de <strong>0 et 1<\/strong>) sont envoy\u00e9es <strong>sous forme de signaux \u00e9lectriques ou radio<\/strong>.<\/li>\n\n\n\n<li>\u00c7a passe par le c\u00e2ble Ethernet, la fibre optique ou les ondes Wi-Fi jusqu\u2019au modem, puis vers Internet.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"et-cote-serveur-wikipedia\">\ud83d\udd01 Et c\u00f4t\u00e9 serveur (Wikip\u00e9dia) ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Le <strong>serveur re\u00e7oit les donn\u00e9es<\/strong> de la requ\u00eate et <strong>les traite dans l&rsquo;ordre inverse<\/strong> (d\u00e9-encapsulation) pour r\u00e9pondre avec la page HTML de Wikip\u00e9dia, qui remonte couche par couche jusqu&rsquo;au navigateur d\u2019Alice.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"en-resume-simplifie\">\ud83e\udde0 En r\u00e9sum\u00e9 (simplifi\u00e9) :<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\">textCopierModifier<code>Alice \u2192 tape \"https:\/\/fr.wikipedia.org\"<br>\u2192 Application : HTTPS<br>\u2192 Pr\u00e9sentation : Chiffrement TLS<br>\u2192 Session : Connexion s\u00e9curis\u00e9e<br>\u2192 Transport : TCP (fiable)<br>\u2192 R\u00e9seau : IP (routage)<br>\u2192 Liaison : Ethernet\/Wi-Fi (MAC)<br>\u2192 Physique : 0 et 1 (signaux)<br>\u2192 Serveur Wikip\u00e9dia \u2192 r\u00e9pond avec la page \u2192 m\u00eame trajet en sens inverse<br><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Le mod\u00e8le OSI (Open Systems Interconnection) est un mod\u00e8le th\u00e9orique qui d\u00e9crit comment les donn\u00e9es circulent dans un r\u00e9seau informatique, depuis une application jusqu\u2019au r\u00e9seau physique, et inversement. Il est [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_crdt_document":"","_uag_custom_page_level_css":"","footnotes":""},"class_list":["post-1538","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mod\u00e8le OSI - workboot<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/workboot.fr\/ciela\/modele-osi\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mod\u00e8le OSI - workboot\" \/>\n<meta property=\"og:description\" content=\"Le mod\u00e8le OSI (Open Systems Interconnection) est un mod\u00e8le th\u00e9orique qui d\u00e9crit comment les donn\u00e9es circulent dans un r\u00e9seau informatique, depuis une application jusqu\u2019au r\u00e9seau physique, et inversement. 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