{"id":236,"date":"2023-07-17T16:19:56","date_gmt":"2023-07-17T16:19:56","guid":{"rendered":"https:\/\/learnsysadmin.com\/?post_type=kbe_knowledgebase&#038;p=236"},"modified":"2023-10-27T00:41:48","modified_gmt":"2023-10-27T00:41:48","slug":"transport-layer-4th-layer-in-osi-model","status":"publish","type":"kbe_knowledgebase","link":"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/transport-layer-4th-layer-in-osi-model\/","title":{"rendered":"Transport Layer &#8211; 4th Layer in OSI Model"},"content":{"rendered":"\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">This article briefly tells you about the <strong>4th Layer<\/strong> in the <strong>OSI<\/strong> (<strong>Open Systems Interconnection<\/strong>) Model, the Transport Layer.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_71 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Summary of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/transport-layer-4th-layer-in-osi-model\/#What_is_Transport_Layer_in_the_OSI_Model\" title=\"What is Transport Layer in the OSI Model?\">What is Transport Layer in the OSI Model?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/transport-layer-4th-layer-in-osi-model\/#What_is_the_Function_of_the_Transport_Layer_%E2%80%93_4th_Layer_in_OSI_Model\" title=\"What is the Function of the Transport Layer &#8211; 4th Layer in OSI Model?\">What is the Function of the Transport Layer &#8211; 4th Layer in OSI Model?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/transport-layer-4th-layer-in-osi-model\/#What_is_the_Unit_of_Data_Encapsulation_in_Transport_Layer\" title=\"What is the Unit of Data Encapsulation in Transport Layer?\">What is the Unit of Data Encapsulation in Transport Layer?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/transport-layer-4th-layer-in-osi-model\/#What_are_the_Protocols_used_at_Transport_Layer\" title=\"What are the Protocols used at Transport Layer?\">What are the Protocols used at Transport Layer?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/transport-layer-4th-layer-in-osi-model\/#Want_to_read_more_about_the_Transport_Layer\" title=\"Want to read more about the Transport Layer?\">Want to read more about the Transport Layer?<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_Transport_Layer_in_the_OSI_Model\"><\/span>What is Transport Layer in the OSI Model?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Transport Layer is the <strong>Fourth layer<\/strong> in the <a href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/osi-open-systems-interconnection-model\/\">OSI model<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_the_Function_of_the_Transport_Layer_%E2%80%93_4th_Layer_in_OSI_Model\"><\/span>What is the Function of the Transport Layer &#8211; 4th Layer in OSI Model?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">The transport layer takes services from the <strong><a href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/application-layer-7th-layer-in-osi-model\/\">Application layer<\/a><\/strong> and provides services to the <strong>Network layer<\/strong>. The <strong>main role<\/strong> of the Transport layer is to <strong>provide<\/strong> the <strong>communication services<\/strong> directly <strong>to<\/strong> the <strong>application processes<\/strong> running <strong>on different hosts<\/strong>. We can also say that the <strong>main duty<\/strong> of Transport layer is to <strong>provide process to process communication<\/strong>.<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Transport Layer is <strong>responsible for delivery of message<\/strong> to appropriate process. Transport Layer <strong>uses a <a href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/port-number\/\">Port Number<\/a><\/strong> to <strong>deliver<\/strong> the segmented data <strong>to the correct process<\/strong> amongst the multiple processes that are <strong>running<\/strong> <strong>on<\/strong> a particular <strong>host<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_the_Unit_of_Data_Encapsulation_in_Transport_Layer\"><\/span>What is the Unit of Data Encapsulation in Transport Layer?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">The <strong>Unit<\/strong> of Data Encapsulation in the Transport Layer is a <strong>Segment<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_are_the_Protocols_used_at_Transport_Layer\"><\/span>What are the Protocols used at Transport Layer?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">The two most important protocols in the Transport Layer are <strong>Transmission Control Protocol (TCP)<\/strong> and <strong>User Datagram Protocol (UDP)<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Want_to_read_more_about_the_Transport_Layer\"><\/span>Want to read more about the Transport Layer?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\">Please click <a href=\"https:\/\/learn.microsoft.com\/en-us\/windows-hardware\/drivers\/network\/windows-network-architecture-and-the-osi-model#transport-layer\">here<\/a> if you want to read more from Microsoft about the 4th Layer in the OSI Model.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This article briefly tells you about the 4th Layer in the OSI (Open Systems Interconnection) Model, the Transport Layer. What is Transport Layer in the OSI Model? Transport Layer is the Fourth layer in the OSI model What is the Function of the Transport Layer &#8211; 4th Layer in OSI Model? The transport layer takes ..<\/p>\n<div class=\"clear-fix\"><\/div>\n<p><a href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/transport-layer-4th-layer-in-osi-model\/\" title=\"read more...\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","kbe_taxonomy":[52],"kbe_tags":[],"class_list":["post-236","kbe_knowledgebase","type-kbe_knowledgebase","status-publish","hentry","kbe_taxonomy-open-systems-interconnection-osi-model"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Transport Layer - 4th Layer in OSI Model - Learn System Administration<\/title>\n<meta name=\"description\" content=\"Transport Layer - 4th Layer in OSI Model, What is Transport Layer - OSI Model, Function and Unit of Data Encapsulation in OSI Transport Layer\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/transport-layer-4th-layer-in-osi-model\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Transport Layer - 4th Layer in OSI Model - Learn System Administration\" \/>\n<meta property=\"og:description\" content=\"Transport Layer - 4th Layer in OSI Model, What is Transport Layer - OSI Model, Function and Unit of Data Encapsulation in OSI Transport Layer\" \/>\n<meta property=\"og:url\" content=\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/transport-layer-4th-layer-in-osi-model\/\" \/>\n<meta property=\"og:site_name\" content=\"Learn System Administration\" \/>\n<meta property=\"article:modified_time\" content=\"2023-10-27T00:41:48+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/transport-layer-4th-layer-in-osi-model\/\",\"url\":\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/transport-layer-4th-layer-in-osi-model\/\",\"name\":\"Transport Layer - 4th Layer in OSI Model - Learn System Administration\",\"isPartOf\":{\"@id\":\"https:\/\/learnsysadmin.com\/#website\"},\"datePublished\":\"2023-07-17T16:19:56+00:00\",\"dateModified\":\"2023-10-27T00:41:48+00:00\",\"description\":\"Transport Layer - 4th Layer in OSI Model, What is Transport Layer - OSI Model, Function and Unit of Data Encapsulation in OSI Transport Layer\",\"breadcrumb\":{\"@id\":\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/transport-layer-4th-layer-in-osi-model\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/transport-layer-4th-layer-in-osi-model\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/transport-layer-4th-layer-in-osi-model\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/learnsysadmin.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Knowledgebase\",\"item\":\"https:\/\/learnsysadmin.com\/index.php\/knowledgebase\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Transport Layer &#8211; 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