{"id":33285,"date":"2025-09-23T17:28:39","date_gmt":"2025-09-23T10:28:39","guid":{"rendered":"https:\/\/interdata.vn\/blog\/?p=33285"},"modified":"2025-09-23T17:28:39","modified_gmt":"2025-09-23T10:28:39","slug":"session-layer-la-gi","status":"publish","type":"post","link":"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/","title":{"rendered":"Session Layer L\u00e0 G\u00ec? Ch\u1ee9c N\u0103ng &#038; V\u00ed D\u1ee5 D\u1ec5 Hi\u1ec3u V\u1ec1 T\u1ea7ng Phi\u00ean"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-white ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">N\u1ed8I DUNG<\/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 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Session-Layer-la-gi\" >Session Layer l\u00e0 g\u00ec?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Dinh-nghia-Session-Layer\" >\u0110\u1ecbnh ngh\u0129a Session Layer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Vi-tri-trong-mo-hinh-OSI\" >V\u1ecb tr\u00ed trong m\u00f4 h\u00ecnh OSI<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Chuc-nang-chinh-cua-Session-Layer\" >Ch\u1ee9c n\u0103ng ch\u00ednh c\u1ee7a Session Layer<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Quan-ly-phien-giao-tiep\" >Qu\u1ea3n l\u00fd phi\u00ean giao ti\u1ebfp<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Dong-bo-hoa-du-lieu\" >\u0110\u1ed3ng b\u1ed9 h\u00f3a d\u1eef li\u1ec7u<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Bao-mat-va-xac-thuc\" >B\u1ea3o m\u1eadt v\u00e0 x\u00e1c th\u1ef1c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Quan-ly-dang-nhap-va-dang-xuat\" >Qu\u1ea3n l\u00fd \u0111\u0103ng nh\u1eadp v\u00e0 \u0111\u0103ng xu\u1ea5t<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Cach-thuc-hoat-dong-cua-Session-Layer\" >C\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Session Layer<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Quan-ly-ket-noi-giua-cac-thiet-bi\" >Qu\u1ea3n l\u00fd k\u1ebft n\u1ed1i gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Dong-bo-hoa-thoi-gian-va-du-lieu\" >\u0110\u1ed3ng b\u1ed9 h\u00f3a th\u1eddi gian v\u00e0 d\u1eef li\u1ec7u<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Cac-giao-thuc-cua-Session-Layer\" >C\u00e1c giao th\u1ee9c c\u1ee7a Session Layer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Tuong-tac-cua-Session-Layer-voi-cac-lop-khac\" >T\u01b0\u01a1ng t\u00e1c c\u1ee7a Session Layer v\u1edbi c\u00e1c l\u1edbp kh\u00e1c<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Su-khac-biet-trong-mo-hinh-TCPIP\" >S\u1ef1 kh\u00e1c bi\u1ec7t trong m\u00f4 h\u00ecnh TCP\/IP<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Khong-co-lop-Phien-tach-biet\" >Kh\u00f4ng c\u00f3 l\u1edbp Phi\u00ean t\u00e1ch bi\u1ec7t<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Cac-chuc-nang-lop-Phien-trong-TCPIP\" >C\u00e1c ch\u1ee9c n\u0103ng l\u1edbp Phi\u00ean trong TCP\/IP<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Mot-so-giao-thuc-Session-Layer-pho-bien\" >M\u1ed9t s\u1ed1 giao th\u1ee9c Session Layer ph\u1ed5 bi\u1ebfn<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/interdata.vn\/blog\/session-layer-la-gi\/#Ket-luan\" >K\u1ebft lu\u1eadn<\/a><\/li><\/ul><\/nav><\/div>\n<p>Khi b\u1ea1n \u0111\u0103ng nh\u1eadp v\u00e0o <a href=\"https:\/\/interdata.vn\/blog\/website-la-gi\/\">website<\/a> ho\u1eb7c duy tr\u00ec phi\u00ean l\u00e0m vi\u1ec7c ngay c\u1ea3 khi chuy\u1ec3n sang tab kh\u00e1c, \u0111\u00f3 l\u00e0 l\u00fac T\u1ea7ng Phi\u00ean (Session Layer) ho\u1ea1t \u0111\u1ed9ng. T\u1ea7ng n\u00e0y ch\u1ecbu tr\u00e1ch nhi\u1ec7m qu\u1ea3n l\u00fd c\u00e1c phi\u00ean giao ti\u1ebfp gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb trong m\u1ea1ng, gi\u00fap duy tr\u00ec k\u1ebft n\u1ed1i \u1ed5n \u0111\u1ecbnh v\u00e0 b\u1ea3o m\u1eadt. Trong b\u00e0i vi\u1ebft n\u00e0y, b\u1ea1n s\u1ebd t\u00ecm hi\u1ec3u v\u1ec1 <strong>T\u1ea7ng Phi\u00ean &#8211; Session Layer l\u00e0 g\u00ec<\/strong> trong m\u00f4 h\u00ecnh OSI, c\u00e1c ch\u1ee9c n\u0103ng ch\u00ednh v\u00e0 c\u00e1c giao th\u1ee9c ph\u1ed5 bi\u1ebfn nh\u01b0 NetBIOS, RPC, v\u00e0 SOCKS. Nh\u1eefng v\u00ed d\u1ee5 th\u1ef1c t\u1ebf s\u1ebd gi\u00fap b\u1ea1n d\u1ec5 d\u00e0ng h\u00ecnh dung v\u00e0 \u00e1p d\u1ee5ng ki\u1ebfn th\u1ee9c n\u00e0y v\u00e0o c\u00f4ng vi\u1ec7c h\u00e0ng ng\u00e0y.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Session-Layer-la-gi\"><\/span><strong>Session Layer l\u00e0 g\u00ec?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Dinh-nghia-Session-Layer\"><\/span>\u0110\u1ecbnh ngh\u0129a Session Layer<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Session Layer<\/strong> (t\u1ea7ng 5 trong m\u00f4 h\u00ecnh <strong>OSI<\/strong>) l\u00e0 t\u1ea7ng ch\u1ecbu tr\u00e1ch nhi\u1ec7m thi\u1ebft l\u1eadp, qu\u1ea3n l\u00fd v\u00e0 k\u1ebft th\u00fac c\u00e1c phi\u00ean giao ti\u1ebfp (session) gi\u1eefa hai \u1ee9ng d\u1ee5ng tr\u00ean hai thi\u1ebft b\u1ecb kh\u00e1c nhau.<\/p>\n<p>H\u00e3y h\u00ecnh dung n\u00f3 nh\u01b0 m\u1ed9t ng\u01b0\u1eddi \u0111i\u1ec1u ph\u1ed1i, \u0111\u1ea3m b\u1ea3o r\u1eb1ng hai b\u00ean c\u00f3 th\u1ec3 &#8220;tr\u00f2 chuy\u1ec7n&#8221; v\u1edbi nhau m\u1ed9t c\u00e1ch c\u00f3 tr\u1eadt t\u1ef1 v\u00e0 hi\u1ec7u qu\u1ea3. M\u1ed9t phi\u00ean giao ti\u1ebfp kh\u00f4ng ch\u1ec9 l\u00e0 vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u \u0111\u01a1n thu\u1ea7n m\u00e0 c\u00f2n l\u00e0 m\u1ed9t &#8220;cu\u1ed9c tr\u00f2 chuy\u1ec7n&#8221; \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t, n\u01a1i c\u00e1c b\u00ean bi\u1ebft khi n\u00e0o c\u00f3 th\u1ec3 g\u1eedi v\u00e0 nh\u1eadn th\u00f4ng tin.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Vi-tri-trong-mo-hinh-OSI\"><\/span>V\u1ecb tr\u00ed trong m\u00f4 h\u00ecnh OSI<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Trong m\u00f4 h\u00ecnh <strong>OSI<\/strong>, Session Layer n\u1eb1m gi\u1eefa <strong>Transport Layer<\/strong> (t\u1ea7ng 4) v\u00e0 <strong>Presentation Layer<\/strong> (t\u1ea7ng 6). V\u1ecb tr\u00ed n\u00e0y r\u1ea5t quan tr\u1ecdng v\u00ec n\u00f3 nh\u1eadn d\u1eef li\u1ec7u t\u1eeb t\u1ea7ng Presentation v\u00e0 chuy\u1ec3n xu\u1ed1ng t\u1ea7ng Transport. M\u1eb7c d\u00f9 n\u00f3 l\u00e0m vi\u1ec7c ch\u1eb7t ch\u1ebd v\u1edbi c\u00e1c t\u1ea7ng kh\u00e1c, vai tr\u00f2 c\u1ee7a n\u00f3 l\u00e0 duy nh\u1ea5t: qu\u1ea3n l\u00fd v\u00e0 duy tr\u00ec tr\u1ea1ng th\u00e1i c\u1ee7a phi\u00ean giao ti\u1ebfp.<\/p>\n<figure id=\"attachment_33293\" aria-describedby=\"caption-attachment-33293\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-33293 size-full\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Session-Layer-la-gi.jpg\" alt=\"Session Layer l\u00e0 g\u00ec\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Session-Layer-la-gi.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Session-Layer-la-gi-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Session-Layer-la-gi-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-33293\" class=\"wp-caption-text\">Session Layer l\u00e0 g\u00ec<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Chuc-nang-chinh-cua-Session-Layer\"><\/span><strong>Ch\u1ee9c n\u0103ng ch\u00ednh c\u1ee7a Session Layer<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>M\u1ed9t s\u1ed1 ng\u01b0\u1eddi th\u01b0\u1eddng nh\u1ea7m l\u1eabn vai tr\u00f2 c\u1ee7a <strong>Session Layer<\/strong> v\u1edbi c\u00e1c t\u1ea7ng kh\u00e1c. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 nh\u1eefng ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i gi\u00fap ph\u00e2n bi\u1ec7t n\u00f3 m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng, k\u00e8m theo c\u00e1c v\u00ed d\u1ee5 th\u1ef1c t\u1ebf.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Quan-ly-phien-giao-tiep\"><\/span>Qu\u1ea3n l\u00fd phi\u00ean giao ti\u1ebfp<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 ch\u1ee9c n\u0103ng quan tr\u1ecdng nh\u1ea5t c\u1ee7a <strong>Session Layer<\/strong>. T\u1ea7ng n\u00e0y ch\u1ecbu tr\u00e1ch nhi\u1ec7m:<\/p>\n<ul>\n<li><strong>Thi\u1ebft l\u1eadp (Establishment):<\/strong> Khi b\u1ea1n \u0111\u0103ng nh\u1eadp v\u00e0o m\u1ed9t \u1ee9ng d\u1ee5ng chat, <strong>Session Layer<\/strong> s\u1ebd thi\u1ebft l\u1eadp m\u1ed9t k\u00eanh k\u1ebft n\u1ed1i logic gi\u1eefa m\u00e1y t\u00ednh c\u1ee7a b\u1ea1n v\u00e0 m\u00e1y ch\u1ee7 chat. Qu\u00e1 tr\u00ecnh n\u00e0y bao g\u1ed3m vi\u1ec7c g\u1eedi v\u00e0 nh\u1eadn c\u00e1c g\u00f3i tin \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 c\u1ea3 hai b\u00ean &#8220;b\u1eaft tay&#8221; v\u00e0 th\u1ed1ng nh\u1ea5t c\u00e1c quy t\u1eafc cho phi\u00ean giao ti\u1ebfp. N\u00f3 \u0111\u1ea3m b\u1ea3o c\u1ea3 hai b\u00ean \u0111\u00e3 s\u1eb5n s\u00e0ng \u0111\u1ec3 trao \u0111\u1ed5i d\u1eef li\u1ec7u.<\/li>\n<li><strong>Duy tr\u00ec (Maintenance):<\/strong> Trong su\u1ed1t qu\u00e1 tr\u00ecnh b\u1ea1n tr\u00f2 chuy\u1ec7n, <strong>Session Layer<\/strong> s\u1ebd duy tr\u00ec k\u1ebft n\u1ed1i n\u00e0y, g\u1eedi c\u00e1c t\u00edn hi\u1ec7u &#8220;heartbeat&#8221; \u0111\u1ecbnh k\u1ef3 \u0111\u1ec3 ki\u1ec3m tra xem c\u1ea3 hai b\u00ean v\u1eabn c\u00f2n k\u1ebft n\u1ed1i v\u00e0 \u0111\u1ea3m b\u1ea3o phi\u00ean l\u00e0m vi\u1ec7c kh\u00f4ng b\u1ecb gi\u00e1n \u0111o\u1ea1n.<\/li>\n<li><strong>K\u1ebft th\u00fac (Termination):<\/strong> Khi b\u1ea1n \u0111\u0103ng xu\u1ea5t ho\u1eb7c \u0111\u00f3ng \u1ee9ng d\u1ee5ng, <strong>Session Layer<\/strong> s\u1ebd k\u1ebft th\u00fac phi\u00ean giao ti\u1ebfp m\u1ed9t c\u00e1ch c\u00f3 tr\u1eadt t\u1ef1, g\u1eedi t\u00edn hi\u1ec7u k\u1ebft th\u00fac \u0111\u1ec3 c\u1ea3 hai b\u00ean gi\u1ea3i ph\u00f3ng t\u00e0i nguy\u00ean m\u1ea1ng.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Dong-bo-hoa-du-lieu\"><\/span>\u0110\u1ed3ng b\u1ed9 h\u00f3a d\u1eef li\u1ec7u<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ch\u1ee9c n\u0103ng n\u00e0y v\u00f4 c\u00f9ng h\u1eefu \u00edch khi truy\u1ec1n t\u1ea3i m\u1ed9t l\u01b0\u1ee3ng l\u1edbn d\u1eef li\u1ec7u ho\u1eb7c trong c\u00e1c \u1ee9ng d\u1ee5ng th\u1eddi gian th\u1ef1c. <strong>Session Layer<\/strong> s\u1ebd ch\u00e8n c\u00e1c \u0111i\u1ec3m ki\u1ec3m tra (checkpoints) v\u00e0o lu\u1ed3ng d\u1eef li\u1ec7u. N\u1ebfu phi\u00ean b\u1ecb gi\u00e1n \u0111o\u1ea1n (v\u00ed d\u1ee5: m\u1ea5t k\u1ebft n\u1ed1i), vi\u1ec7c ph\u1ee5c h\u1ed3i s\u1ebd b\u1eaft \u0111\u1ea7u t\u1eeb \u0111i\u1ec3m ki\u1ec3m tra g\u1ea7n nh\u1ea5t thay v\u00ec ph\u1ea3i g\u1eedi l\u1ea1i to\u00e0n b\u1ed9 d\u1eef li\u1ec7u t\u1eeb \u0111\u1ea7u.<\/p>\n<ul>\n<li><strong>V\u00ed d\u1ee5:<\/strong> T\u01b0\u1edfng t\u01b0\u1ee3ng b\u1ea1n v\u00e0 \u0111\u1ed3ng nghi\u1ec7p \u0111ang c\u00f9ng ch\u1ec9nh s\u1eeda m\u1ed9t t\u00e0i li\u1ec7u tr\u1ef1c tuy\u1ebfn. <strong>Session Layer<\/strong> s\u1ebd t\u1ea1o c\u00e1c \u0111i\u1ec3m \u0111\u1ed3ng b\u1ed9 \u0111\u1ecbnh k\u1ef3 (v\u00ed d\u1ee5: m\u1ed7i khi b\u1ea1n l\u01b0u ho\u1eb7c sau 5 ph\u00fat), \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c thay \u0111\u1ed5i \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt \u0111\u1ed3ng th\u1eddi. N\u1ebfu m\u1ea1ng b\u1ecb r\u1edbt, khi k\u1ebft n\u1ed1i \u0111\u01b0\u1ee3c kh\u00f4i ph\u1ee5c, \u1ee9ng d\u1ee5ng s\u1ebd ph\u1ee5c h\u1ed3i tr\u1ea1ng th\u00e1i t\u1eeb \u0111i\u1ec3m \u0111\u1ed3ng b\u1ed9 cu\u1ed1i c\u00f9ng, tr\u00e1nh m\u1ea5t m\u00e1t d\u1eef li\u1ec7u v\u00e0 \u0111\u1ea3m b\u1ea3o s\u1ef1 nh\u1ea5t qu\u00e1n cho c\u1ea3 hai ng\u01b0\u1eddi d\u00f9ng.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Bao-mat-va-xac-thuc\"><\/span>B\u1ea3o m\u1eadt v\u00e0 x\u00e1c th\u1ef1c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>Session Layer<\/strong> c\u0169ng \u0111\u00f3ng vai tr\u00f2 trong vi\u1ec7c x\u00e1c th\u1ef1c ng\u01b0\u1eddi d\u00f9ng. M\u1eb7c d\u00f9 vi\u1ec7c m\u00e3 h\u00f3a d\u1eef li\u1ec7u th\u01b0\u1eddng do Presentation Layer \u0111\u1ea3m nh\u1eadn, <strong>Session Layer<\/strong> v\u1eabn gi\u00fap thi\u1ebft l\u1eadp c\u00e1c quy tr\u00ecnh x\u00e1c th\u1ef1c ban \u0111\u1ea7u \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o hai b\u00ean tham gia phi\u00ean giao ti\u1ebfp l\u00e0 h\u1ee3p l\u1ec7. V\u00ed d\u1ee5, trong qu\u00e1 tr\u00ecnh thi\u1ebft l\u1eadp m\u1ed9t phi\u00ean giao ti\u1ebfp an to\u00e0n b\u1eb1ng <strong>SSL\/TLS<\/strong>, <strong>Session Layer<\/strong> s\u1ebd tham gia v\u00e0o qu\u00e1 tr\u00ecnh trao \u0111\u1ed5i kh\u00f3a v\u00e0 ch\u1ee9ng th\u1ef1c \u0111\u1ec3 x\u00e1c minh danh t\u00ednh c\u1ee7a m\u00e1y ch\u1ee7 tr\u01b0\u1edbc khi b\u1eaft \u0111\u1ea7u phi\u00ean.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Quan-ly-dang-nhap-va-dang-xuat\"><\/span>Qu\u1ea3n l\u00fd \u0111\u0103ng nh\u1eadp v\u00e0 \u0111\u0103ng xu\u1ea5t<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ch\u1ee9c n\u0103ng n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ea5y r\u00f5 trong c\u00e1c <a href=\"https:\/\/interdata.vn\/blog\/web-application-la-gi\/\">\u1ee9ng d\u1ee5ng web<\/a>. Sau khi ng\u01b0\u1eddi d\u00f9ng x\u00e1c th\u1ef1c th\u00e0nh c\u00f4ng, <strong>Session Layer<\/strong> s\u1ebd t\u1ea1o ra m\u1ed9t session ID duy nh\u1ea5t. Session ID n\u00e0y gi\u1ed1ng nh\u01b0 m\u1ed9t chi\u1ebfc v\u00e9 th\u00f4ng h\u00e0nh, \u0111\u01b0\u1ee3c g\u1eedi \u0111i trong c\u00e1c y\u00eau c\u1ea7u ti\u1ebfp theo c\u1ee7a tr\u00ecnh duy\u1ec7t. N\u00f3 cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp c\u00e1c trang n\u1ed9i b\u1ed9 m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i \u0111\u0103ng nh\u1eadp l\u1ea1i, duy tr\u00ec tr\u1ea1ng th\u00e1i \u0111\u0103ng nh\u1eadp cho \u0111\u1ebfn khi phi\u00ean k\u1ebft th\u00fac (do \u0111\u0103ng xu\u1ea5t ho\u1eb7c h\u1ebft th\u1eddi gian).<\/p>\n<figure id=\"attachment_33294\" aria-describedby=\"caption-attachment-33294\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-33294\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Chuc-nang-chinh-cua-Session-Layer.jpg\" alt=\"Ch\u1ee9c n\u0103ng ch\u00ednh c\u1ee7a Session Layer\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Chuc-nang-chinh-cua-Session-Layer.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Chuc-nang-chinh-cua-Session-Layer-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Chuc-nang-chinh-cua-Session-Layer-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-33294\" class=\"wp-caption-text\">Ch\u1ee9c n\u0103ng ch\u00ednh c\u1ee7a Session Layer<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Cach-thuc-hoat-dong-cua-Session-Layer\"><\/span><strong>C\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Session Layer<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0110\u1ec3 hi\u1ec3u r\u00f5 c\u00e1ch <strong>Session Layer<\/strong> ho\u1ea1t \u0111\u1ed9ng, h\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng m\u1ed9t cu\u1ed9c tr\u00f2 chuy\u1ec7n gi\u1eefa hai ng\u01b0\u1eddi. <strong>Session Layer<\/strong> s\u1ebd l\u00e0 ng\u01b0\u1eddi \u0111i\u1ec1u ph\u1ed1i, quy\u1ebft \u0111\u1ecbnh ai n\u00f3i tr\u01b0\u1edbc, ai n\u00f3i sau v\u00e0 khi n\u00e0o cu\u1ed9c tr\u00f2 chuy\u1ec7n k\u1ebft th\u00fac.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Quan-ly-ket-noi-giua-cac-thiet-bi\"><\/span>Qu\u1ea3n l\u00fd k\u1ebft n\u1ed1i gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Khi m\u1ed9t \u1ee9ng d\u1ee5ng tr\u00ean m\u00e1y t\u00ednh c\u1ee7a b\u1ea1n mu\u1ed1n k\u1ebft n\u1ed1i v\u1edbi m\u1ed9t \u1ee9ng d\u1ee5ng tr\u00ean m\u00e1y ch\u1ee7, <strong>Session Layer<\/strong> s\u1ebd thi\u1ebft l\u1eadp m\u1ed9t k\u1ebft n\u1ed1i logic. Qu\u00e1 tr\u00ecnh n\u00e0y bao g\u1ed3m ba giai \u0111o\u1ea1n ch\u00ednh:<\/p>\n<ol>\n<li><strong>Thi\u1ebft l\u1eadp phi\u00ean (Session Establishment):<\/strong> Hai thi\u1ebft b\u1ecb trao \u0111\u1ed5i th\u00f4ng tin \u0111\u1ec3 th\u1ed1ng nh\u1ea5t c\u00e1c th\u00f4ng s\u1ed1 c\u1ee7a phi\u00ean, ch\u1eb3ng h\u1ea1n nh\u01b0 ai l\u00e0 ng\u01b0\u1eddi kh\u1edfi t\u1ea1o v\u00e0 ai l\u00e0 ng\u01b0\u1eddi nh\u1eadn.<\/li>\n<li><strong>Truy\u1ec1n d\u1eef li\u1ec7u (<a href=\"https:\/\/interdata.vn\/blog\/data-transfer\/\">Data Transfer<\/a>):<\/strong> D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c g\u1eedi \u0111i theo m\u1ed9t tr\u1eadt t\u1ef1 nh\u1ea5t \u0111\u1ecbnh, c\u00f3 th\u1ec3 l\u00e0 \u0111\u01a1n c\u00f4ng (m\u1ed9t chi\u1ec1u), b\u00e1n song c\u00f4ng (hai chi\u1ec1u nh\u01b0ng kh\u00f4ng c\u00f9ng l\u00fac), ho\u1eb7c song c\u00f4ng (hai chi\u1ec1u c\u00f9ng l\u00fac).<\/li>\n<li><strong>K\u1ebft th\u00fac phi\u00ean (Session Termination):<\/strong> Khi phi\u00ean giao ti\u1ebfp ho\u00e0n t\u1ea5t, <strong>Session Layer<\/strong> s\u1ebd \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u1ea3 hai b\u00ean \u0111\u1ec1u \u0111\u1ed3ng \u00fd k\u1ebft th\u00fac k\u1ebft n\u1ed1i, tr\u00e1nh vi\u1ec7c m\u1ed9t b\u00ean v\u1eabn g\u1eedi d\u1eef li\u1ec7u trong khi b\u00ean kia \u0111\u00e3 \u0111\u00f3ng.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Dong-bo-hoa-thoi-gian-va-du-lieu\"><\/span>\u0110\u1ed3ng b\u1ed9 h\u00f3a th\u1eddi gian v\u00e0 d\u1eef li\u1ec7u<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u kh\u00f4ng b\u1ecb th\u1ea5t l\u1ea1c trong qu\u00e1 tr\u00ecnh truy\u1ec1n t\u1ea3i, <strong>Session Layer<\/strong> s\u1eed d\u1ee5ng c\u00e1c \u0111i\u1ec3m \u0111\u1ed3ng b\u1ed9 (synchronization points).<\/p>\n<p><strong>V\u00ed d\u1ee5:<\/strong> Trong m\u1ed9t cu\u1ed9c g\u1ecdi video tr\u1ef1c tuy\u1ebfn, <strong>Session Layer<\/strong> s\u1ebd \u0111\u1ed3ng b\u1ed9 h\u00f3a lu\u1ed3ng \u00e2m thanh v\u00e0 h\u00ecnh \u1ea3nh \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o h\u00ecnh \u1ea3nh kh\u00f4ng b\u1ecb &#8220;t\u1ee5t&#8221; so v\u1edbi \u00e2m thanh. N\u1ebfu m\u1ed9t g\u00f3i d\u1eef li\u1ec7u b\u1ecb m\u1ea5t, n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u1ee5c h\u1ed3i t\u1eeb \u0111i\u1ec3m \u0111\u1ed3ng b\u1ed9 g\u1ea7n nh\u1ea5t, gi\u00fap tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng \u0111\u01b0\u1ee3c m\u01b0\u1ee3t m\u00e0 h\u01a1n.<\/p>\n<figure id=\"attachment_33295\" aria-describedby=\"caption-attachment-33295\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-33295\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Cach-hoat-dong-cua-Session-Layer.jpg\" alt=\"C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Session Layer\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Cach-hoat-dong-cua-Session-Layer.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Cach-hoat-dong-cua-Session-Layer-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Cach-hoat-dong-cua-Session-Layer-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-33295\" class=\"wp-caption-text\">C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Session Layer<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Cac-giao-thuc-cua-Session-Layer\"><\/span><strong>C\u00e1c giao th\u1ee9c c\u1ee7a Session Layer<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>M\u1eb7c d\u00f9 vai tr\u00f2 c\u1ee7a <strong>Session Layer<\/strong> th\u01b0\u1eddng \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p v\u00e0o c\u00e1c t\u1ea7ng cao h\u01a1n trong c\u00e1c m\u00f4 h\u00ecnh m\u1ea1ng hi\u1ec7n \u0111\u1ea1i nh\u01b0 TCP\/IP, m\u1ed9t s\u1ed1 giao th\u1ee9c v\u1eabn \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn l\u00e0 ho\u1ea1t \u0111\u1ed9ng ch\u1ee7 y\u1ebfu \u1edf t\u1ea7ng n\u00e0y.<\/p>\n<ul>\n<li><strong>NetBIOS<\/strong> (Network Basic Input\/Output System): Giao th\u1ee9c n\u00e0y \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c m\u1ea1ng LAN c\u1ee7a Microsoft \u0111\u1ec3 cho ph\u00e9p c\u00e1c \u1ee9ng d\u1ee5ng tr\u00ean c\u00e1c m\u00e1y t\u00ednh kh\u00e1c nhau giao ti\u1ebfp v\u1edbi nhau.<\/li>\n<li><strong>RPC<\/strong> (Remote Procedure Call): RPC l\u00e0 m\u1ed9t giao th\u1ee9c cho ph\u00e9p m\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh tr\u00ean m\u1ed9t m\u00e1y t\u00ednh g\u1ecdi m\u1ed9t th\u1ee7 t\u1ee5c (procedure) ho\u1eb7c h\u00e0m (function) tr\u00ean m\u1ed9t m\u00e1y t\u00ednh kh\u00e1c m\u00e0 kh\u00f4ng c\u1ea7n bi\u1ebft chi ti\u1ebft v\u1ec1 m\u1ea1ng.<\/li>\n<li><strong>ISO 8327:<\/strong> \u0110\u00e2y l\u00e0 giao th\u1ee9c chu\u1ea9n qu\u1ed1c t\u1ebf, l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a b\u1ed9 giao th\u1ee9c OSI, x\u00e1c \u0111\u1ecbnh c\u00e1c d\u1ecbch v\u1ee5 v\u00e0 quy t\u1eafc cho <strong>Session Layer<\/strong>.<\/li>\n<li><strong>SOCKS<\/strong> (SOCKet Secure): SOCKS l\u00e0 m\u1ed9t giao th\u1ee9c proxy <a href=\"https:\/\/interdata.vn\/blog\/mang-internet\/\">internet<\/a> x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u t\u1eeb m\u1ed9t m\u00e1y kh\u00e1ch v\u00e0 chuy\u1ec3n ti\u1ebfp ch\u00fang \u0111\u1ebfn m\u1ed9t m\u00e1y ch\u1ee7. SOCKS c\u00f3 th\u1ec3 l\u00e0m vi\u1ec7c \u1edf <strong>Session Layer<\/strong> \u0111\u1ec3 thi\u1ebft l\u1eadp c\u00e1c phi\u00ean giao ti\u1ebfp.<\/li>\n<\/ul>\n<figure id=\"attachment_33296\" aria-describedby=\"caption-attachment-33296\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-33296\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Giao-thuc-cua-Session-Layer.jpg\" alt=\"Giao th\u1ee9c c\u1ee7a Session Layer\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Giao-thuc-cua-Session-Layer.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Giao-thuc-cua-Session-Layer-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Giao-thuc-cua-Session-Layer-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-33296\" class=\"wp-caption-text\">Giao th\u1ee9c c\u1ee7a Session Layer<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Tuong-tac-cua-Session-Layer-voi-cac-lop-khac\"><\/span><strong>T\u01b0\u01a1ng t\u00e1c c\u1ee7a Session Layer v\u1edbi c\u00e1c l\u1edbp kh\u00e1c<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Vi\u1ec7c hi\u1ec3u <strong>Session Layer l\u00e0 g\u00ec<\/strong> kh\u00f4ng th\u1ec3 t\u00e1ch r\u1eddi kh\u1ecfi m\u1ed1i quan h\u1ec7 c\u1ee7a n\u00f3 v\u1edbi c\u00e1c t\u1ea7ng kh\u00e1c trong m\u00f4 h\u00ecnh OSI.<\/p>\n<ul>\n<li><strong>T\u01b0\u01a1ng t\u00e1c v\u1edbi l\u1edbp Transport Layer:<\/strong> M\u1ed9t trong nh\u1eefng nh\u1ea7m l\u1eabn l\u1edbn nh\u1ea5t l\u00e0 gi\u1eefa <strong>Session Layer<\/strong> v\u00e0 <strong>Transport Layer<\/strong>.\n<ul>\n<li><strong>Transport Layer<\/strong> (t\u1ea7ng 4) ch\u1ecbu tr\u00e1ch nhi\u1ec7m v\u1eadn chuy\u1ec3n d\u1eef li\u1ec7u t\u1eeb m\u1ed9t c\u1ed5ng (<a href=\"https:\/\/interdata.vn\/blog\/port-la-gi\/\">port<\/a>) tr\u00ean m\u1ed9t thi\u1ebft b\u1ecb \u0111\u1ebfn m\u1ed9t c\u1ed5ng tr\u00ean m\u1ed9t thi\u1ebft b\u1ecb kh\u00e1c. N\u00f3 quan t\u00e2m \u0111\u1ebfn \u0111\u1ed9 tin c\u1eady c\u1ee7a vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u gi\u1eefa hai m\u00e1y, s\u1eed d\u1ee5ng c\u00e1c giao th\u1ee9c nh\u01b0 TCP v\u00e0 UDP.<\/li>\n<li><strong>Session Layer<\/strong> (t\u1ea7ng 5) l\u1ea1i t\u1eadp trung v\u00e0o vi\u1ec7c qu\u1ea3n l\u00fd &#8220;cu\u1ed9c tr\u00f2 chuy\u1ec7n&#8221; gi\u1eefa hai \u1ee9ng d\u1ee5ng. V\u00ed d\u1ee5, Transport Layer c\u00f3 th\u1ec3 m\u1edf m\u1ed9t k\u1ebft n\u1ed1i TCP gi\u1eefa hai m\u00e1y t\u00ednh, nh\u01b0ng <strong>Session Layer<\/strong> s\u1ebd l\u00e0 ng\u01b0\u1eddi qu\u1ea3n l\u00fd c\u00e1c phi\u00ean ri\u00eang l\u1ebb c\u1ee7a c\u00e1c \u1ee9ng d\u1ee5ng \u0111ang ch\u1ea1y tr\u00ean k\u1ebft n\u1ed1i \u0111\u00f3.<\/li>\n<\/ul>\n<\/li>\n<li><strong>T\u01b0\u01a1ng t\u00e1c v\u1edbi l\u1edbp Application Layer:<\/strong> <strong>Session Layer<\/strong> cung c\u1ea5p d\u1ecbch v\u1ee5 cho <strong>Application Layer<\/strong> (t\u1ea7ng 7). C\u00e1c \u1ee9ng d\u1ee5ng nh\u01b0 tr\u00ecnh duy\u1ec7t web, email client kh\u00f4ng ph\u1ea3i t\u1ef1 x\u1eed l\u00fd vi\u1ec7c qu\u1ea3n l\u00fd phi\u00ean. Thay v\u00e0o \u0111\u00f3, ch\u00fang s\u1eed d\u1ee5ng c\u00e1c d\u1ecbch v\u1ee5 c\u1ee7a <strong>Session Layer<\/strong> \u0111\u1ec3 thi\u1ebft l\u1eadp v\u00e0 duy tr\u00ec c\u00e1c &#8220;cu\u1ed9c tr\u00f2 chuy\u1ec7n&#8221; v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng t\u01b0\u01a1ng \u1ee9ng \u1edf ph\u00eda m\u00e1y ch\u1ee7.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Su-khac-biet-trong-mo-hinh-TCPIP\"><\/span>S\u1ef1 kh\u00e1c bi\u1ec7t trong m\u00f4 h\u00ecnh TCP\/IP<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>M\u1eb7c d\u00f9 m\u00f4 h\u00ecnh OSI l\u00e0 m\u1ed9t m\u00f4 h\u00ecnh l\u00fd thuy\u1ebft quan tr\u1ecdng, m\u00f4 h\u00ecnh TCP\/IP l\u1ea1i l\u00e0 m\u00f4 h\u00ecnh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i tr\u00ean internet hi\u1ec7n nay.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Khong-co-lop-Phien-tach-biet\"><\/span>Kh\u00f4ng c\u00f3 l\u1edbp Phi\u00ean t\u00e1ch bi\u1ec7t<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>M\u00f4 h\u00ecnh TCP\/IP ch\u1ec9 c\u00f3 b\u1ed1n t\u1ea7ng, v\u00e0 kh\u00f4ng c\u00f3 m\u1ed9t t\u1ea7ng ri\u00eang bi\u1ec7t n\u00e0o d\u00e0nh cho Session Layer hay Presentation Layer. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 g\u00e2y ra m\u1ed9t ch\u00fat b\u1ed1i r\u1ed1i cho nh\u1eefng ng\u01b0\u1eddi m\u1edbi h\u1ecdc.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Cac-chuc-nang-lop-Phien-trong-TCPIP\"><\/span>C\u00e1c ch\u1ee9c n\u0103ng l\u1edbp Phi\u00ean trong TCP\/IP<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Trong m\u00f4 h\u00ecnh TCP\/IP, c\u00e1c ch\u1ee9c n\u0103ng c\u1ee7a <strong>Session Layer<\/strong> \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p v\u00e0o <strong>Application Layer<\/strong> (t\u1ea7ng 4 trong m\u00f4 h\u00ecnh TCP\/IP) v\u00e0 <strong>Transport Layer<\/strong> (t\u1ea7ng 3 trong m\u00f4 h\u00ecnh TCP\/IP).<\/p>\n<ul>\n<li><strong>T\u1ea7ng \u1ee8ng d\u1ee5ng (Application Layer):<\/strong> C\u00e1c giao th\u1ee9c \u1edf t\u1ea7ng n\u00e0y nh\u01b0 HTTP, <a href=\"https:\/\/interdata.vn\/blog\/ftp-la-gi\/\">FTP<\/a>, SMTP th\u01b0\u1eddng t\u1ef1 x\u1eed l\u00fd vi\u1ec7c thi\u1ebft l\u1eadp v\u00e0 qu\u1ea3n l\u00fd phi\u00ean. V\u00ed d\u1ee5, HTTP s\u1eed d\u1ee5ng &#8220;session cookies&#8221; \u0111\u1ec3 duy tr\u00ec tr\u1ea1ng th\u00e1i c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/li>\n<li><strong>T\u1ea7ng V\u1eadn chuy\u1ec3n (Transport Layer):<\/strong> C\u00e1c giao th\u1ee9c nh\u01b0 TCP c\u0169ng c\u00f3 c\u00e1c c\u01a1 ch\u1ebf \u0111\u1ec3 qu\u1ea3n l\u00fd k\u1ebft n\u1ed1i v\u00e0 \u0111\u1ed3ng b\u1ed9 h\u00f3a, h\u1ed7 tr\u1ee3 m\u1ed9t ph\u1ea7n ch\u1ee9c n\u0103ng c\u1ee7a <strong>Session Layer<\/strong>.<\/li>\n<\/ul>\n<figure id=\"attachment_33299\" aria-describedby=\"caption-attachment-33299\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-33299\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Tuong-tac-cua-Session-Layer.jpg\" alt=\"T\u01b0\u01a1ng t\u00e1c c\u1ee7a Session Layer\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Tuong-tac-cua-Session-Layer.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Tuong-tac-cua-Session-Layer-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Tuong-tac-cua-Session-Layer-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-33299\" class=\"wp-caption-text\">T\u01b0\u01a1ng t\u00e1c c\u1ee7a Session Layer<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Mot-so-giao-thuc-Session-Layer-pho-bien\"><\/span><strong>M\u1ed9t s\u1ed1 giao th\u1ee9c Session Layer ph\u1ed5 bi\u1ebfn<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Ngo\u00e0i c\u00e1c giao th\u1ee9c \u0111\u00e3 k\u1ec3 tr\u00ean, d\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 giao th\u1ee9c kh\u00e1c c\u00f3 th\u1ec3 b\u1ea1n \u0111\u00e3 t\u1eebng nghe qua.<\/p>\n<ul>\n<li><strong>AppleTalk Data Stream Protocol (ADSP):<\/strong> Giao th\u1ee9c n\u00e0y cho ph\u00e9p c\u00e1c thi\u1ebft b\u1ecb Apple Macintosh thi\u1ebft l\u1eadp v\u00e0 duy tr\u00ec c\u00e1c lu\u1ed3ng d\u1eef li\u1ec7u hai chi\u1ec1u.<\/li>\n<li><strong>Real-time Transport Control Protocol (RTCP):<\/strong> Th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng c\u00f9ng v\u1edbi RTP (Real-time Transport Protocol) \u0111\u1ec3 gi\u00e1m s\u00e1t ch\u1ea5t l\u01b0\u1ee3ng truy\u1ec1n t\u1ea3i d\u1eef li\u1ec7u th\u1eddi gian th\u1ef1c nh\u01b0 \u00e2m thanh v\u00e0 video. RTCP gi\u00fap b\u00e1o c\u00e1o v\u1ec1 ch\u1ea5t l\u01b0\u1ee3ng phi\u00ean \u0111\u1ec3 c\u00e1c \u1ee9ng d\u1ee5ng c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh lu\u1ed3ng d\u1eef li\u1ec7u cho ph\u00f9 h\u1ee3p.<\/li>\n<li><strong>Point-to-Point Tunneling Protocol (PPTP):<\/strong> M\u1ed9t giao th\u1ee9c VPN c\u0169 h\u01a1n, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o m\u1ed9t \u0111\u01b0\u1eddng h\u1ea7m ri\u00eang t\u01b0 qua m\u1ea1ng c\u00f4ng c\u1ed9ng.<\/li>\n<li><strong>Password <a href=\"https:\/\/interdata.vn\/blog\/authentication-la-gi\/\">Authentication<\/a> Protocol (PAP):<\/strong> M\u1ed9t giao th\u1ee9c x\u00e1c th\u1ef1c c\u01a1 b\u1ea3n, g\u1eedi t\u00ean ng\u01b0\u1eddi d\u00f9ng v\u00e0 m\u1eadt kh\u1ea9u d\u01b0\u1edbi d\u1ea1ng v\u0103n b\u1ea3n kh\u00f4ng \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a.<\/li>\n<li><strong>Sockets Direct Protocol (SDP):<\/strong> Giao th\u1ee9c n\u00e0y cho ph\u00e9p c\u00e1c \u1ee9ng d\u1ee5ng giao ti\u1ebfp v\u1edbi nhau b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c socket, m\u1ed9t c\u01a1 ch\u1ebf <a href=\"https:\/\/interdata.vn\/blog\/lap-trinh-la-gi\/\">l\u1eadp tr\u00ecnh<\/a> ph\u1ed5 bi\u1ebfn \u0111\u1ec3 qu\u1ea3n l\u00fd c\u00e1c k\u1ebft n\u1ed1i m\u1ea1ng.<\/li>\n<\/ul>\n<figure id=\"attachment_33297\" aria-describedby=\"caption-attachment-33297\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-33297\" src=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Giao-thuc-Session-Layer-pho-bien.jpg\" alt=\"Giao th\u1ee9c Session Layer ph\u1ed5 bi\u1ebfn\" width=\"800\" height=\"500\" title=\"\" srcset=\"https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Giao-thuc-Session-Layer-pho-bien.jpg 800w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Giao-thuc-Session-Layer-pho-bien-300x188.jpg 300w, https:\/\/interdata.vn\/blog\/wp-content\/uploads\/2025\/09\/Giao-thuc-Session-Layer-pho-bien-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-33297\" class=\"wp-caption-text\">Giao th\u1ee9c Session Layer ph\u1ed5 bi\u1ebfn<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Ket-luan\"><\/span><strong>K\u1ebft lu\u1eadn<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Qua b\u00e0i vi\u1ebft n\u00e0y, hy v\u1ecdng b\u1ea1n \u0111\u00e3 c\u00f3 c\u00e1i nh\u00ecn t\u1ed5ng quan v\u00e0 s\u00e2u s\u1eafc h\u01a1n v\u1ec1 <strong>Session Layer l\u00e0 g\u00ec<\/strong>. M\u1eb7c d\u00f9 kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng hi\u1ec3n hi\u1ec7n r\u00f5 r\u00e0ng, vai tr\u00f2 c\u1ee7a <strong>Session Layer<\/strong> l\u00e0 c\u1ef1c k\u1ef3 quan tr\u1ecdng trong vi\u1ec7c \u0111\u1ea3m b\u1ea3o c\u00e1c \u1ee9ng d\u1ee5ng c\u00f3 th\u1ec3 giao ti\u1ebfp v\u1edbi nhau m\u1ed9t c\u00e1ch c\u00f3 tr\u1eadt t\u1ef1 v\u00e0 hi\u1ec7u qu\u1ea3.<\/p>\n<p>N\u1eafm v\u1eefng ki\u1ebfn th\u1ee9c n\u00e0y kh\u00f4ng ch\u1ec9 gi\u00fap b\u1ea1n hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 m\u00f4 h\u00ecnh OSI m\u00e0 c\u00f2n l\u00e0 n\u1ec1n t\u1ea3ng v\u1eefng ch\u1eafc \u0111\u1ec3 b\u1ea1n ti\u1ebfp t\u1ee5c kh\u00e1m ph\u00e1 c\u00e1c t\u1ea7ng ph\u1ee9c t\u1ea1p h\u01a1n c\u1ee7a m\u1ea1ng m\u00e1y t\u00ednh. T\u1ea1i <a href=\"https:\/\/interdata.vn\/\"><strong>InterData<\/strong><\/a>, ch\u00fang t\u00f4i lu\u00f4n s\u1eb5n s\u00e0ng cung c\u1ea5p nh\u1eefng ki\u1ebfn th\u1ee9c chuy\u00ean s\u00e2u, gi\u00fap b\u1ea1n n\u00e2ng cao n\u0103ng l\u1ef1c v\u00e0 ph\u00e1t tri\u1ec3n s\u1ef1 nghi\u1ec7p trong ng\u00e0nh c\u00f4ng ngh\u1ec7 th\u00f4ng tin.<\/p>\n<p>N\u1ebfu b\u1ea1n c\u00f3 b\u1ea5t k\u1ef3 c\u00e2u h\u1ecfi n\u00e0o kh\u00e1c ho\u1eb7c mu\u1ed1n t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 c\u00e1c kh\u00e1i ni\u1ec7m m\u1ea1ng m\u00e1y t\u00ednh kh\u00e1c, \u0111\u1eebng ng\u1ea7n ng\u1ea1i \u0111\u1ec3 l\u1ea1i b\u00ecnh lu\u1eadn nh\u00e9.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Khi b\u1ea1n \u0111\u0103ng nh\u1eadp v\u00e0o website ho\u1eb7c duy tr\u00ec phi\u00ean l\u00e0m vi\u1ec7c ngay c\u1ea3 khi chuy\u1ec3n sang tab kh\u00e1c, \u0111\u00f3 l\u00e0 l\u00fac T\u1ea7ng Phi\u00ean (Session Layer) ho\u1ea1t \u0111\u1ed9ng. T\u1ea7ng n\u00e0y ch\u1ecbu tr\u00e1ch nhi\u1ec7m qu\u1ea3n l\u00fd c\u00e1c phi\u00ean giao ti\u1ebfp gi\u1eefa c\u00e1c thi\u1ebft b\u1ecb trong m\u1ea1ng, gi\u00fap duy tr\u00ec k\u1ebft n\u1ed1i \u1ed5n \u0111\u1ecbnh v\u00e0 b\u1ea3o m\u1eadt.<\/p>\n","protected":false},"author":27,"featured_media":33292,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[151],"tags":[],"class_list":["post-33285","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mang"],"_links":{"self":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/33285","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/users\/27"}],"replies":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/comments?post=33285"}],"version-history":[{"count":7,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/33285\/revisions"}],"predecessor-version":[{"id":33386,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/posts\/33285\/revisions\/33386"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media\/33292"}],"wp:attachment":[{"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/media?parent=33285"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/categories?post=33285"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/interdata.vn\/blog\/wp-json\/wp\/v2\/tags?post=33285"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}