{"id":172,"date":"2026-05-02T01:02:45","date_gmt":"2026-05-01T23:02:45","guid":{"rendered":"https:\/\/eryann.fr\/?p=172"},"modified":"2026-05-02T14:08:16","modified_gmt":"2026-05-02T12:08:16","slug":"fiche-protocoles-echanges-reseau-des-principaux-protocoles","status":"publish","type":"post","link":"https:\/\/eryann.fr\/index.php\/reseau\/fiche-protocoles-echanges-reseau-des-principaux-protocoles\/","title":{"rendered":"Fiche protocoles : \u00e9changes r\u00e9seau des principaux protocoles"},"content":{"rendered":"\n<p><audio autoplay=\"\"><\/audio><\/p>\n\n\n\n<p>Pour les \u00e9tudiants en BTS CIEL ou SIO, comprendre les \u00e9changes r\u00e9seau est essentiel pour :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>analyser un trafic avec Wireshark<\/li>\n\n\n\n<li>diagnostiquer un probl\u00e8me r\u00e9seau<\/li>\n\n\n\n<li>d\u00e9tecter une anomalie ou une attaque<\/li>\n<\/ul>\n\n\n\n<p>Cette fiche pr\u00e9sente les \u00e9changes des principaux protocoles utilis\u00e9s en r\u00e9seau.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"683\" height=\"1024\" src=\"https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/21a0ec6b-a223-435f-9703-b5204f2d9705-683x1024.png\" alt=\"\" class=\"wp-image-175\" srcset=\"https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/21a0ec6b-a223-435f-9703-b5204f2d9705-683x1024.png 683w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/21a0ec6b-a223-435f-9703-b5204f2d9705-200x300.png 200w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/21a0ec6b-a223-435f-9703-b5204f2d9705-768x1152.png 768w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/21a0ec6b-a223-435f-9703-b5204f2d9705.png 1024w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\u00c9changes des protocoles (bloc unique)<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code># =========================================================<br># ARP<br># =========================================================<br>Who has 192.168.1.1 ? Tell 192.168.1.10<br>192.168.1.1 is at 00:11:22:33:44:55<br><br># =========================================================<br># DHCP<br># =========================================================<br>DISCOVER \u2192 OFFER \u2192 REQUEST \u2192 ACK<br><br># =========================================================<br># DNS<br># =========================================================<br>Client \u2192 DNS : query google.com<br>DNS \u2192 Client : r\u00e9ponse IP<br><br># =========================================================<br># TCP<br># =========================================================<br>SYN \u2192 SYN-ACK \u2192 ACK<br><br># =========================================================<br># ICMP<br># =========================================================<br>Echo Request \u2192 Echo Reply<br><br># =========================================================<br># HTTP<br># =========================================================<br>GET \/index.html<br>\u2192 200 OK<br><br># =========================================================<br># HTTPS<br># =========================================================<br>Client Hello \u2192 Server Hello \u2192 certificat \u2192 cl\u00e9 \u2192 chiffrement<br><br># =========================================================<br># FTP<br># =========================================================<br>USER admin<br>PASS password<br><br># =========================================================<br># SSH<br># =========================================================<br>Handshake \u2192 \u00e9change de cl\u00e9s \u2192 communication chiffr\u00e9e<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Explication d\u00e9taill\u00e9e<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">ARP<\/h4>\n\n\n\n<p>Permet de r\u00e9soudre une adresse IP en adresse MAC.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>requ\u00eate broadcast<\/li>\n\n\n\n<li>r\u00e9ponse unicast<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">DHCP<\/h4>\n\n\n\n<p>Attribue automatiquement une configuration r\u00e9seau.<\/p>\n\n\n\n<p>S\u00e9quence :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Discover<\/li>\n\n\n\n<li>Offer<\/li>\n\n\n\n<li>Request<\/li>\n\n\n\n<li>Ack<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">DNS<\/h4>\n\n\n\n<p>Traduit un nom de domaine en adresse IP.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">TCP<\/h4>\n\n\n\n<p>Protocole de transport fiable.<\/p>\n\n\n\n<p>Connexion :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SYN<\/li>\n\n\n\n<li>SYN-ACK<\/li>\n\n\n\n<li>ACK<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">ICMP<\/h4>\n\n\n\n<p>Protocole de diagnostic r\u00e9seau.<\/p>\n\n\n\n<p>Utilis\u00e9 pour :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ping<\/li>\n\n\n\n<li>test de connectivit\u00e9<\/li>\n\n\n\n<li>messages d\u2019erreur r\u00e9seau<\/li>\n<\/ul>\n\n\n\n<p>Exemple :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ping 192.168.1.1<\/code><\/pre>\n\n\n\n<p>\u00c9change :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Echo Request<\/li>\n\n\n\n<li>Echo Reply<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">HTTP<\/h4>\n\n\n\n<p>Protocole web non s\u00e9curis\u00e9.<br>Donn\u00e9es en clair.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">HTTPS<\/h4>\n\n\n\n<p>Version s\u00e9curis\u00e9e de HTTP.<br>Communication chiffr\u00e9e via TLS.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">FTP<\/h4>\n\n\n\n<p>Transfert de fichiers non s\u00e9curis\u00e9.<br>Identifiants en clair.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">SSH<\/h4>\n\n\n\n<p>Acc\u00e8s distant s\u00e9curis\u00e9.<br>Communication chiffr\u00e9e.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Utilisation en analyse r\u00e9seau<\/h3>\n\n\n\n<p>Avec Wireshark :<\/p>\n\n\n\n<p>Filtres utiles :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>icmp<br>tcp<br>dns<br>http<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Cas pratiques<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Test connectivit\u00e9<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>ping 8.8.8.8<\/code><\/pre>\n\n\n\n<p>\u2192 ICMP<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">Probl\u00e8me r\u00e9seau<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>pas de r\u00e9ponse ICMP<br>\u2192 probl\u00e8me r\u00e9seau ou firewall<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">Scan r\u00e9seau<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ICMP utilis\u00e9 pour d\u00e9tecter machines actives<\/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\">Bonnes pratiques<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ne pas bloquer ICMP compl\u00e8tement (diagnostic utile)<\/li>\n\n\n\n<li>surveiller les flux ICMP anormaux<\/li>\n\n\n\n<li>utiliser ICMP pour tester rapidement un r\u00e9seau<\/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\">R\u00e9capitulatif<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Protocole<\/th><th>Fonction<\/th><th>S\u00e9curit\u00e9<\/th><\/tr><\/thead><tbody><tr><td>ARP<\/td><td>IP \u2192 MAC<\/td><td>non<\/td><\/tr><tr><td>DHCP<\/td><td>attribution IP<\/td><td>non<\/td><\/tr><tr><td>DNS<\/td><td>nom \u2192 IP<\/td><td>non<\/td><\/tr><tr><td>TCP<\/td><td>transport<\/td><td>non<\/td><\/tr><tr><td>ICMP<\/td><td>diagnostic<\/td><td>non<\/td><\/tr><tr><td>HTTP<\/td><td>web<\/td><td>non<\/td><\/tr><tr><td>HTTPS<\/td><td>web s\u00e9curis\u00e9<\/td><td>oui<\/td><\/tr><tr><td>FTP<\/td><td>transfert<\/td><td>non<\/td><\/tr><tr><td>SSH<\/td><td>acc\u00e8s distant<\/td><td>oui<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Conclusion<\/h3>\n\n\n\n<p>L\u2019ajout d\u2019ICMP compl\u00e8te la compr\u00e9hension du r\u00e9seau :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>diagnostic rapide<\/li>\n\n\n\n<li>d\u00e9tection des pannes<\/li>\n\n\n\n<li>analyse des communications<\/li>\n<\/ul>\n\n\n\n<p>C\u2019est un protocole cl\u00e9 pour tout administrateur r\u00e9seau.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><audio autoplay=\"\"><\/audio><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pour les \u00e9tudiants en BTS CIEL ou SIO, comprendre les \u00e9changes r\u00e9seau est essentiel pour : Cette fiche pr\u00e9sente les \u00e9changes des principaux protocoles utilis\u00e9s en r\u00e9seau. \u00c9changes des protocoles (bloc unique) Explication d\u00e9taill\u00e9e ARP Permet de r\u00e9soudre une adresse IP en adresse MAC. DHCP Attribue automatiquement une configuration r\u00e9seau. S\u00e9quence : DNS Traduit un [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[10],"tags":[],"class_list":["post-172","post","type-post","status-publish","format-standard","hentry","category-reseau"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fiche protocoles : \u00e9changes r\u00e9seau des principaux protocoles - Eryann Breizh SecOps<\/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:\/\/eryann.fr\/index.php\/reseau\/fiche-protocoles-echanges-reseau-des-principaux-protocoles\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fiche protocoles : \u00e9changes r\u00e9seau des principaux protocoles - Eryann Breizh SecOps\" \/>\n<meta property=\"og:description\" content=\"Pour les \u00e9tudiants en BTS CIEL ou SIO, comprendre les \u00e9changes r\u00e9seau est essentiel pour : Cette fiche pr\u00e9sente les \u00e9changes des principaux protocoles utilis\u00e9s en r\u00e9seau. \u00c9changes des protocoles (bloc unique) Explication d\u00e9taill\u00e9e ARP Permet de r\u00e9soudre une adresse IP en adresse MAC. 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