{"id":4163,"date":"2024-04-09T08:08:20","date_gmt":"2024-04-09T08:08:20","guid":{"rendered":"http:\/\/screamingfrog.club\/quest-ce-que-le-cdn\/"},"modified":"2024-07-05T08:21:24","modified_gmt":"2024-07-05T08:21:24","slug":"quest-ce-que-le-cdn","status":"publish","type":"post","link":"https:\/\/screamingfrog.club\/fr\/quest-ce-que-le-cdn\/","title":{"rendered":"Qu&rsquo;est-ce que le CDN ?"},"content":{"rendered":"<p><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container has-pattern-background has-mask-background fusion-parallax-none nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-background-image:url(&quot;http:\/\/screamingfrog.club\/wp-content\/uploads\/2024\/04\/Screaming-Frog-1.webp&quot;);--awb-background-size:cover;--awb-flex-wrap:wrap;\" data-preload-img=\"http:\/\/screamingfrog.club\/wp-content\/uploads\/2024\/04\/Screaming-Frog-1.webp\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-center fusion-flex-align-content-center fusion-flex-content-wrap\" style=\"max-width:1248px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-padding-top:4%;--awb-padding-right:4%;--awb-padding-bottom:4%;--awb-padding-left:4%;--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\" data-scroll-devices=\"small-visibility,medium-visibility,large-visibility\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-center fusion-content-layout-column\"><div class=\"fusion-title title fusion-title-1 fusion-sep-none fusion-title-center fusion-title-text fusion-title-size-one\" style=\"--awb-text-color:#ffffff;--awb-font-size:50px;\"><h1 class=\"fusion-title-heading title-heading-center\" style=\"font-family:&quot;Montserrat&quot;;font-style:normal;font-weight:200;margin:0;letter-spacing:-5px;font-size:1em;line-height:1em;\">Qu&rsquo;est-ce que le CDN ?<\/h1><\/div><div class=\"fusion-title title fusion-title-2 fusion-sep-none fusion-title-center fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:#ffffff;--awb-font-size:14px;\"><h2 class=\"fusion-title-heading title-heading-center\" style=\"font-family:&quot;Montserrat&quot;;font-style:normal;font-weight:600;margin:0;letter-spacing:3px;font-size:1em;line-height:14px;\">Content Delivery Network<\/h2><\/div><div style=\"text-align:center;\"><a class=\"fusion-button button-flat fusion-button-default-size button-custom fusion-button-default button-1 fusion-button-default-span fusion-button-default-type\" style=\"--button_accent_color:var(--awb-color1);--button_accent_hover_color:var(--awb-color1);--button_border_hover_color:var(--awb-color1);--button_gradient_top_color:rgba(0,0,0,0.3);--button_gradient_bottom_color:rgba(0,0,0,0.3);--button_gradient_top_color_hover:rgba(0,0,0,0);--button_gradient_bottom_color_hover:rgba(0,0,0,0);--button_font_size:16px;--button_line_height:70px;--button_typography-letter-spacing:8px;--button_typography-font-family:&quot;Montserrat&quot;;--button_typography-font-style:normal;--button_typography-font-weight:700;\" target=\"_self\" href=\"#explore\"><span class=\"fusion-button-text awb-button__text awb-button__text--default\">EXPLOREZ<\/span><\/a><\/div><\/div><\/div><\/div><\/div><div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-2 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1248px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-1 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-title title fusion-title-3 fusion-title-center fusion-title-text fusion-title-size-two\" style=\"--awb-text-color:#141617;--awb-margin-top:20px;--awb-margin-bottom:20px;--awb-sep-color:var(--awb-color6);--awb-font-size:40px;\"><div class=\"title-sep-container title-sep-container-left\"><div class=\"title-sep sep-single sep-solid\" style=\"border-color:var(--awb-color6);\"><\/div><\/div><span class=\"awb-title-spacer\"><\/span><h2 class=\"fusion-title-heading title-heading-center awb-gradient-text fusion-responsive-typography-calculated\" style=\"font-family:&quot;Work Sans&quot;;font-style:normal;font-weight:800;margin:0;letter-spacing:-0.012em;text-transform:var(--awb-typography1-text-transform);background-color:#f79501;background-image:linear-gradient(150deg, #f79501 20%,#fe6996 100%);font-size:1em;--fontSize:40;line-height:1;\">CDN (Content Delivery Network)<\/h2><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep-single sep-solid\" style=\"border-color:var(--awb-color6);\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-1\"><p>Les CDN sont une excellente solution pour distribuer des contenus multim\u00e9dias sur plusieurs serveurs et optimiser les performances des sites web ou de commerce \u00e9lectronique et am\u00e9liorer l&rsquo;exp\u00e9rience utilisateur gr\u00e2ce \u00e0 la mise en cache du contenu.<\/p>\n<p class=\"p1\">Gr\u00e2ce au <strong>r\u00e9seau de diffusion de contenu<\/strong>, les distances entre le serveur et l&rsquo;utilisateur final sont r\u00e9duites, ce qui le rend id\u00e9al pour la diffusion de contenu statique et dynamique.<\/p>\n<p>De nombreux sites de commerce \u00e9lectronique ou de grande envergure, tels qu&rsquo;Amazon, Netflix ou Meta lui-m\u00eame, utilisent un CDN pour rendre l&rsquo;exp\u00e9rience de la page plus fluide.<\/p>\n<p>Google \u00e9tant tr\u00e8s sensible \u00e0 l&rsquo;exp\u00e9rience utilisateur, les CDN peuvent \u00eatre la bonne solution pour y parvenir.<\/p>\n<p>Au niveau du r\u00e9f\u00e9rencement, l&rsquo;utilisation de CDN pour les images est tr\u00e8s importante pour am\u00e9liorer les performances au regard de <a href=\"https:\/\/screamingfrog.club\/fr\/analyse-web-de-vitals\/\">Core Web Vitals<\/a>, en particulier pour la m\u00e9trique LCP (Largest Contentful Paint).<\/p>\n<\/div><div class=\"fusion-title title fusion-title-4 fusion-title-center fusion-title-text fusion-title-size-three\" style=\"--awb-text-color:#141617;--awb-margin-top:20px;--awb-margin-bottom:20px;--awb-sep-color:var(--awb-color6);--awb-font-size:40px;\"><div class=\"title-sep-container title-sep-container-left\"><div class=\"title-sep sep-single sep-solid\" style=\"border-color:var(--awb-color6);\"><\/div><\/div><span class=\"awb-title-spacer\"><\/span><h3 class=\"fusion-title-heading title-heading-center awb-gradient-text fusion-responsive-typography-calculated\" style=\"font-family:&quot;Work Sans&quot;;font-style:normal;font-weight:800;margin:0;letter-spacing:-0.012em;text-transform:var(--awb-typography1-text-transform);background-color:#f79501;background-image:linear-gradient(150deg, #f79501 20%,#fe6996 100%);font-size:1em;--fontSize:40;line-height:1;\">CDN : Architecture<\/h3><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep-single sep-solid\" style=\"border-color:var(--awb-color6);\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-2\"><p class=\"p1\">L&rsquo;architecture d&rsquo;un r\u00e9seau de diffusion de contenu (CDN) est assez complexe, mais elle se compose g\u00e9n\u00e9ralement de plusieurs \u00e9l\u00e9ments cl\u00e9s qui fonctionnent ensemble pour fournir du contenu aux clients de mani\u00e8re efficace et fiable. Voici un aper\u00e7u des principaux composants d&rsquo;une architecture CDN :<\/p>\n<ul class=\"ul1\">\n<li class=\"li1\">Points de <b> pr\u00e9sence (PoP<\/b>) : les PoP sont des serveurs g\u00e9ographiquement r\u00e9partis en diff\u00e9rents endroits strat\u00e9giques dans le monde. Chaque PoP contient un cache du contenu le plus populaire et sert de point de diffusion local pour les utilisateurs situ\u00e9s \u00e0 proximit\u00e9. Plus le nombre de points de contact est \u00e9lev\u00e9, meilleure est la couverture g\u00e9ographique et plus le contenu est proche des utilisateurs finaux.<\/li>\n<li class=\"li1\"><b> Serveurs sources<\/b>: il s&rsquo;agit des serveurs d&rsquo;origine qui h\u00e9bergent le contenu du site web. Le CDN r\u00e9cup\u00e8re le contenu des serveurs sources et le distribue aux points de contact pour la mise en cache.<\/li>\n<li class=\"li1\"><b> Routage et<\/b> \u00e9quilibrage de <b> la charge<\/b>: le CDN utilise des algorithmes de routage et d&rsquo;\u00e9quilibrage de la charge pour diriger les demandes des utilisateurs vers les PoP les plus appropri\u00e9s et pour r\u00e9partir la charge de mani\u00e8re \u00e9gale entre les PoP.<\/li>\n<li class=\"li1\"><b> Logiciel de cache<\/b>: chaque point de contact est \u00e9quip\u00e9 d&rsquo;un logiciel de cache qui stocke temporairement le contenu le plus demand\u00e9. Cela permet de r\u00e9duire les temps de latence et d&rsquo;am\u00e9liorer les performances globales de la distribution de contenu.<\/li>\n<li class=\"li1\">R\u00e9seaux de <b> transport mondiaux<\/b>: les CDN utilisent souvent des r\u00e9seaux de transport tr\u00e8s performants pour garantir une connexion rapide et fiable entre les serveurs sources, les points de contact et les utilisateurs finaux.<\/li>\n<li class=\"li1\"><b> Surveillance<\/b> et analyse : les outils de surveillance et d&rsquo;analyse sont utilis\u00e9s pour surveiller les performances du CDN, collecter des donn\u00e9es sur les sch\u00e9mas de trafic et identifier tout probl\u00e8me de performance ou de s\u00e9curit\u00e9.<\/li>\n<\/ul>\n<p class=\"p1\">Globalement, l&rsquo;architecture d&rsquo;un CDN est con\u00e7ue pour am\u00e9liorer les performances, la fiabilit\u00e9 et la s\u00e9curit\u00e9 de la distribution de contenu sur l&rsquo;internet, en fournissant du contenu aux clients rapidement et efficacement, o\u00f9 qu&rsquo;ils se trouvent dans le monde.<\/p>\n<\/div><div class=\"fusion-title title fusion-title-5 fusion-title-center fusion-title-text fusion-title-size-three\" style=\"--awb-text-color:#141617;--awb-margin-top:20px;--awb-margin-bottom:20px;--awb-sep-color:var(--awb-color6);--awb-font-size:40px;\"><div class=\"title-sep-container title-sep-container-left\"><div class=\"title-sep sep-single sep-solid\" style=\"border-color:var(--awb-color6);\"><\/div><\/div><span class=\"awb-title-spacer\"><\/span><h3 class=\"fusion-title-heading title-heading-center awb-gradient-text fusion-responsive-typography-calculated\" style=\"font-family:&quot;Work Sans&quot;;font-style:normal;font-weight:800;margin:0;letter-spacing:-0.012em;text-transform:var(--awb-typography1-text-transform);background-color:#f79501;background-image:linear-gradient(150deg, #f79501 20%,#fe6996 100%);font-size:1em;--fontSize:40;line-height:1;\">CDN : les avantages<\/h3><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep-single sep-solid\" style=\"border-color:var(--awb-color6);\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-3\"><p>Vous l&rsquo;aurez compris, si votre entreprise accueille des visiteurs dispers\u00e9s dans le monde entier, un CDN est une solution hautement recommand\u00e9e. Examinons les avantages en d\u00e9tail.<\/p>\n<ol>\n<li><strong>R\u00e9duction du temps de chargement<\/strong>: le principal avantage est la r\u00e9duction du temps n\u00e9cessaire pour \u00e9quilibrer le chargement du site web ; ce sc\u00e9nario conduit potentiellement \u00e0 une r\u00e9duction drastique du taux de rebond en raison de l&rsquo;am\u00e9lioration de la perception de l&rsquo;utilisateur qui navigue sur votre site web.<\/li>\n<li><strong>R\u00e9duction des temps d&rsquo;arr\u00eat<\/strong>: gr\u00e2ce au CDN, le site web gagne en stabilit\u00e9 en ne d\u00e9pendant pas enti\u00e8rement de l&rsquo;h\u00e9bergeur, de sorte que s&rsquo;il \u00e9tait compromis, il pourrait s&rsquo;appuyer sur les serveurs du Content Delivery Network et garantir la continuit\u00e9 du service au visiteur.<\/li>\n<li><strong>S\u00e9curit\u00e9 contre les attaques DDoS<\/strong>: gr\u00e2ce \u00e0 la pr\u00e9sence de plusieurs serveurs, les diff\u00e9rents n\u0153uds du CDN att\u00e9nuent l&rsquo;attaque frauduleuse en diminuant les risques d&rsquo;indisponibilit\u00e9 du site.<\/li>\n<\/ol>\n<\/div><div class=\"fusion-title title fusion-title-6 fusion-title-center fusion-title-text fusion-title-size-three\" style=\"--awb-text-color:#141617;--awb-margin-top:20px;--awb-margin-bottom:20px;--awb-sep-color:var(--awb-color6);--awb-font-size:40px;\"><div class=\"title-sep-container title-sep-container-left\"><div class=\"title-sep sep-single sep-solid\" style=\"border-color:var(--awb-color6);\"><\/div><\/div><span class=\"awb-title-spacer\"><\/span><h3 class=\"fusion-title-heading title-heading-center awb-gradient-text fusion-responsive-typography-calculated\" style=\"font-family:&quot;Work Sans&quot;;font-style:normal;font-weight:800;margin:0;letter-spacing:-0.012em;text-transform:var(--awb-typography1-text-transform);background-color:#f79501;background-image:linear-gradient(150deg, #f79501 20%,#fe6996 100%);font-size:1em;--fontSize:40;line-height:1;\">CDN : inconv\u00e9nients pour le r\u00e9f\u00e9rencement<\/h3><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep-single sep-solid\" style=\"border-color:var(--awb-color6);\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-4\"><p>Cependant, le CDN peut aussi cacher des pi\u00e8ges en mati\u00e8re de r\u00e9f\u00e9rencement, et certains experts du secteur remettent en question son utilisation parce qu&rsquo;il pourrait avoir une incidence n\u00e9gative sur le classement des contenus multim\u00e9dias.<\/p>\n<p>Les principaux inconv\u00e9nients concernent deux sc\u00e9narios :<\/p>\n<ol>\n<li><strong>Domaine CDN<\/strong>: le contenu r\u00e9pond avec des chemins autres que le nom d&rsquo;h\u00f4te du site web et peut constituer un mauvais signal dans l&rsquo;indexation du contenu. Le m\u00eame probl\u00e8me se poserait \u00e9galement, mais de mani\u00e8re moins grave, si le CDN \u00e9tait h\u00e9berg\u00e9 sur un sous-domaine du site web (dans ce cas, il serait toutefois possible de travailler en cr\u00e9ant un sous-domaine personnalis\u00e9).<\/li>\n<li><strong>Contenu<\/strong> dupliqu\u00e9 : les images peuvent \u00eatre consid\u00e9r\u00e9es comme dupliqu\u00e9es. Pour ce probl\u00e8me, il suffira de d\u00e9finir un <em>en-t\u00eate canonique<\/em> indiquant au robot d&rsquo;exploration que le contenu du CDN est une copie de l&rsquo;original.<\/li>\n<\/ol>\n<\/div><div class=\"fusion-title title fusion-title-7 fusion-title-center fusion-title-text fusion-title-size-three\" style=\"--awb-text-color:#141617;--awb-margin-top:20px;--awb-margin-bottom:20px;--awb-sep-color:var(--awb-color6);--awb-font-size:40px;\"><div class=\"title-sep-container title-sep-container-left\"><div class=\"title-sep sep-single sep-solid\" style=\"border-color:var(--awb-color6);\"><\/div><\/div><span class=\"awb-title-spacer\"><\/span><h3 class=\"fusion-title-heading title-heading-center awb-gradient-text fusion-responsive-typography-calculated\" style=\"font-family:&quot;Work Sans&quot;;font-style:normal;font-weight:800;margin:0;letter-spacing:-0.012em;text-transform:var(--awb-typography1-text-transform);background-color:#f79501;background-image:linear-gradient(150deg, #f79501 20%,#fe6996 100%);font-size:1em;--fontSize:40;line-height:1;\">CDN et Screaming Frog<\/h3><span class=\"awb-title-spacer\"><\/span><div class=\"title-sep-container title-sep-container-right\"><div class=\"title-sep sep-single sep-solid\" style=\"border-color:var(--awb-color6);\"><\/div><\/div><\/div><div class=\"fusion-text fusion-text-5\"><p>Outre sa configuration, le CDN doit encore \u00eatre contr\u00f4l\u00e9 en performance pour garantir les avantages que nous avons \u00e9num\u00e9r\u00e9s ci-dessus. C&rsquo;est l\u00e0 que Seo Spider vous vient en aide avec sa fonction d\u00e9di\u00e9e dans le MENU \u00ab\u00a0Config. &gt; CDN\u00a0\u00bb.<\/p>\n<p class=\"p1\">Screaming Frog vous permet de saisir une liste de CDN qui seront trait\u00e9s comme des ressources internes (URL) lors de l&rsquo;analyse.<\/p>\n<p class=\"p1\">Le Seo Spider permet \u00e9galement de fournir un sous-dossier avec le domaine, de sorte que le sous-dossier (et le contenu qu&rsquo;il contient) est trait\u00e9 comme interne.<\/p>\n<p class=\"p1\">Les connexions CDN peuvent alors \u00eatre contr\u00f4l\u00e9es dans l&rsquo;onglet \u00ab\u00a0Interne\u00a0\u00bb, et vous pouvez g\u00e9rer un plus grand nombre de d\u00e9tails qu&rsquo;en les utilisant comme connexions externes.<\/p>\n<p>&nbsp;<\/p>\n<\/div><div class=\"fusion-image-element \" style=\"--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-1 hover-type-none\"><img decoding=\"async\" width=\"2606\" height=\"1640\" alt=\"Come configurare l&#039;analisi della CDN con il Seo Spider.\" title=\"Funzione CDN con Screaming Frog\" src=\"http:\/\/screamingfrog.club\/wp-content\/uploads\/2024\/04\/Funzione-CDN-con-Screaming-Frog.png\" class=\"img-responsive wp-image-2396\" srcset=\"https:\/\/screamingfrog.club\/wp-content\/uploads\/2024\/04\/Funzione-CDN-con-Screaming-Frog-200x126.png 200w, https:\/\/screamingfrog.club\/wp-content\/uploads\/2024\/04\/Funzione-CDN-con-Screaming-Frog-400x252.png 400w, https:\/\/screamingfrog.club\/wp-content\/uploads\/2024\/04\/Funzione-CDN-con-Screaming-Frog-600x378.png 600w, https:\/\/screamingfrog.club\/wp-content\/uploads\/2024\/04\/Funzione-CDN-con-Screaming-Frog-800x503.png 800w, https:\/\/screamingfrog.club\/wp-content\/uploads\/2024\/04\/Funzione-CDN-con-Screaming-Frog-1200x755.png 1200w, https:\/\/screamingfrog.club\/wp-content\/uploads\/2024\/04\/Funzione-CDN-con-Screaming-Frog.png 2606w\" sizes=\"(max-width: 640px) 100vw, 1200px\" \/><\/span><\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[83],"tags":[80,85],"class_list":["post-4163","post","type-post","status-publish","format-standard","hentry","category-seo-wiki","tag-debutant","tag-seo-fr"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Qu&#039;est-ce que le CDN ? 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