{"id":11881,"date":"2024-08-18T09:59:27","date_gmt":"2024-08-18T09:59:27","guid":{"rendered":"https:\/\/symlexvpn.com\/?p=11881"},"modified":"2025-12-02T11:50:20","modified_gmt":"2025-12-02T11:50:20","slug":"layer-2-vs-layer-3-vpn","status":"publish","type":"post","link":"https:\/\/symlexvpn.com\/zh\/layer-2-vs-layer-3-vpn\/","title":{"rendered":"Layer 2 vs. Layer 3 VPN &#8211; Learn the Key Differences"},"content":{"rendered":"<p>\u7b2c 2 \u5c42\u548c\u7b2c 3 \u5c42\u662f OSI\uff08\u5f00\u653e\u7cfb\u7edf\u4e92\u8fde\uff09\u6a21\u578b\u7684\u4e24\u4e2a\u5173\u952e\u5c42\u3002 <\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-key-takeaways\"><strong>\u8981\u70b9\uff1a<\/strong><\/h3>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-layer-2\">\u7b2c2\u5c42<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7b2c 2 \u5c42 VPN \u8fd0\u884c\u5728 <strong>\u7b2c\u4e8c\u6570\u636e\u94fe\u8def\u5c42<\/strong> \u4ec5\u4f7f\u7528\u8bbe\u5907\u7684 OSI \u6a21\u578b <strong>MAC\u5730\u5740<\/strong> \u7528\u4e8e\u6570\u636e\u4f20\u8f93\u3002&nbsp;<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e8c\u5c42\u4ea4\u6362\u673a\u662f <strong>\u5feb\u70b9 <\/strong>\u5e76\u8981\u6c42 <strong>\u6700\u4f4e\u914d\u7f6e<\/strong>\uff0c\u4f7f\u5b83\u4eec\u5728\u5bb6\u5ead\u548c\u5c0f\u578b\u4f01\u4e1a\u4e2d\u5f88\u5e38\u89c1\u3002<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-layer-3\">\u7b2c3\u5c42<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7b2c 3 \u5c42 VPN \u8fd0\u884c\u5728 <strong>\u6570\u636e\u94fe\u8def\u5c42\u548c\u7f51\u7edc\u5c42<\/strong> \u901a\u8fc7 <strong>IP\u5730\u5740<\/strong> \u548c <strong>VLAN\u95f4\u901a\u4fe1<\/strong> using the devices&#8217; MAC and IP addresses.&nbsp;<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Layer 3 switches combine some of the router&#8217;s capabilities but are more complex and expensive than layer 2 switches.&nbsp;<\/li>\n<\/ul>\n\n\n\n<p>\u7b2c 2 \u5c42\u548c\u7b2c 3 \u5c42\u8d1f\u8d23\u4e0d\u540c\u8bbe\u5907\u4e4b\u95f4\u7684\u7f51\u7edc\u901a\u4fe1\u3002\u8fd9\u4e24\u5c42\u90fd\u6709\u5404\u81ea\u7684\u7279\u70b9\u3001\u4f18\u70b9\u548c\u7f3a\u70b9\u3002 <\/p>\n\n\n\n<p>Let&#8217;s discuss <strong>layer 2 vs layer 3 vpn <\/strong>in detail.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<div class=\"wp-block-yoast-seo-table-of-contents yoast-table-of-contents\"><h2>\u76ee\u5f55<\/h2><ul><li><a href=\"#h-layer-2-vs-layer-3-quick-comparison\" data-level=\"2\">\u7b2c 2 \u5c42\u4e0e\u7b2c 3 \u5c42\uff1a\u5feb\u901f\u6bd4\u8f83<\/a><\/li><li><a href=\"#h-what-is-an-osi-model\" data-level=\"2\">\u4ec0\u4e48\u662f OSI \u6a21\u578b\uff1f<\/a><\/li><li><a href=\"#h-what-is-a-layer-2-or-data-link-layer\" data-level=\"2\">\u4ec0\u4e48\u662f\u7b2c 2 \u5c42\u6216\u6570\u636e\u94fe\u8def\u5c42\uff1f<\/a><\/li><li><a href=\"#h-what-is-an-mpls-vpn\" data-level=\"2\">\u4ec0\u4e48\u662f MPLS VPN\uff1f<\/a><\/li><li><a href=\"#h-why-use-the-mpls-network\" data-level=\"2\">\u4e3a\u4ec0\u4e48\u4f7f\u7528 MPLS \u7f51\u7edc\uff1f<\/a><\/li><li><a href=\"#h-mpls-vs-vpn\" data-level=\"2\">MPLS \u4e0e VPN<\/a><\/li><li><a href=\"#h-is-vpn-a-layer-2-or-layer-3\" data-level=\"2\">VPN \u662f\u7b2c 2 \u5c42\u8fd8\u662f\u7b2c 3 \u5c42\uff1f<\/a><\/li><li><a href=\"#h-frequently-asked-questions-faqs\" data-level=\"2\">\u5e38\u89c1\u95ee\u9898 (FAQ)<\/a><\/li><li><a href=\"#h-conclusion\" data-level=\"2\">\u7ed3\u8bba<\/a><\/li><\/ul><\/div>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-layer-2-vs-layer-3-quick-comparison\">\u7b2c 2 \u5c42\u4e0e\u7b2c 3 \u5c42\uff1a\u5feb\u901f\u6bd4\u8f83<\/h2>\n\n\n\n<p>Here\u2019s a quick comparison on <strong>\u7b2c 2 \u5c42\u4e0e\u7b2c 3 \u5c42 VPN<\/strong> <strong>\u865a\u62df\u4e13\u7528\u7f51<\/strong>\uff0c\u7c7b\u4f3c\u4e8e\u6211\u4eec\u6240\u505a\u7684 <a href=\"https:\/\/symlexvpn.com\/zh\/tcp-vs-udp\/\">TCP \u4e0e UDP<\/a>. <\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>\u56e0\u7d20<\/strong><\/td><td><strong>\u7b2c2\u5c42&nbsp;<\/strong><\/td><td><strong>\u7b2c3\u5c42<\/strong><\/td><\/tr><tr><td>\u529f\u80fd<\/td><td>\u7b2c 2 \u5c42\u5de5\u4f5c\u5728\u6570\u636e\u5c42<\/td><td>\u7b2c 3 \u5c42\u4f7f\u7528\u7f51\u7edc<\/td><\/tr><tr><td>\u5bfb\u5740<\/td><td>MAC\uff08\u5a92\u4f53\u8bbf\u95ee\u63a7\u5236\uff09<\/td><td>IP\uff08\u4e92\u8054\u7f51\u534f\u8bae\uff09<\/td><\/tr><tr><td>\u8bbe\u5907<\/td><td>\u5f00\u5173\u3001\u7f51\u6865<\/td><td>\u8def\u7531\u5668<\/td><\/tr><tr><td>\u6570\u636e\u5904\u7406<\/td><td>\u955c\u6846<\/td><td>\u6570\u636e\u5305<\/td><\/tr><tr><td>\u8def\u7531<\/td><td>\u5c40\u57df\u7f51 (LAN)<\/td><td>\u5e7f\u57df\u7f51 (WAN)<\/td><\/tr><tr><td>\u8303\u56f4<\/td><td>\u5c40\u57df\u901a\u8baf<\/td><td>\u7aef\u5230\u7aef\u901a\u4fe1<\/td><\/tr><tr><td>\u793a\u4f8b<\/td><td>\u65e0\u7ebf\u7f51\u7edc\u3001\u4ee5\u592a\u7f51<\/td><td>IP, IPv4, IPv6<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-is-an-osi-model\">\u4ec0\u4e48\u662f OSI \u6a21\u578b\uff1f<\/h2>\n\n\n\n<p>\u4e00\u4e2a <a href=\"https:\/\/aws.amazon.com\/what-is\/osi-model\">OSI\uff08\u5f00\u653e\u7cfb\u7edf\u4e92\u8fde\uff09<\/a> \u662f\u4e00\u4e2a\u6982\u5ff5\u6846\u67b6\uff0c\u5c06\u7f51\u7edc\u901a\u4fe1\u5206\u4e3a\u4e03\u5c42\u3002\u5b83\u7684\u5de5\u4f5c\u539f\u7406\u5c31\u50cf\u8ba1\u7b97\u673a\u7f51\u7edc\u7cfb\u7edf\u7684\u901a\u7528\u8bed\u8a00\uff0c\u5141\u8bb8\u4e0d\u540c\u7684\u6280\u672f\u76f8\u4e92\u901a\u4fe1\u3002<\/p>\n\n\n\n<p>OSI \u6a21\u578b\u6709\u52a9\u4e8e\u63cf\u8ff0\u6570\u636e\u901a\u4fe1\u4e2d\u7684\u6bcf\u4e2a\u7ec4\u4ef6\uff0c\u4e3a\u5e94\u7528\u7a0b\u5e8f\u548c\u7f51\u7edc\u57fa\u7840\u8bbe\u65bd\u5efa\u7acb\u89c4\u5219\u548c\u6807\u51c6\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-here-are-some-key-characteristics-of-the-osi-model\"><strong>\u4ee5\u4e0b\u662f OSI \u6a21\u578b\u7684\u4e00\u4e9b\u5173\u952e\u7279\u5f81\uff1a<\/strong><\/h3>\n\n\n\n<p><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4e03\u5c42\uff1a<\/strong> OSI\u6a21\u578b\u6709\u4e03\u5c42\uff0c\u6bcf\u4e00\u5c42\u8d1f\u8d23\u901a\u4fe1\u8fc7\u7a0b\u4e2d\u7684\u4e00\u4e2a\u529f\u80fd\u3002<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><a href=\"https:\/\/docs.google.com\/document\/d\/14_xSsqc6uCyLcawR2WOTfMR71x2f49ZTwtLOZgQIY3A\/edit?pli=1#heading=h.lhqzeurp75v5\">\u5e94\u7528\u5c42<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/docs.google.com\/document\/d\/14_xSsqc6uCyLcawR2WOTfMR71x2f49ZTwtLOZgQIY3A\/edit?pli=1#heading=h.rqtv3qy7a2a4\">\u8868\u793a\u5c42<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/docs.google.com\/document\/d\/14_xSsqc6uCyLcawR2WOTfMR71x2f49ZTwtLOZgQIY3A\/edit?pli=1#heading=h.rqtv3qy7a2a4\">\u4f1a\u8bdd\u5c42<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/docs.google.com\/document\/d\/14_xSsqc6uCyLcawR2WOTfMR71x2f49ZTwtLOZgQIY3A\/edit?pli=1#heading=h.rqtv3qy7a2a4\">\u4f20\u8f93\u5c42<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/docs.google.com\/document\/d\/14_xSsqc6uCyLcawR2WOTfMR71x2f49ZTwtLOZgQIY3A\/edit?pli=1#heading=h.rqtv3qy7a2a4\">\u7f51\u7edc\u5c42<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/docs.google.com\/document\/d\/14_xSsqc6uCyLcawR2WOTfMR71x2f49ZTwtLOZgQIY3A\/edit?pli=1#heading=h.rqtv3qy7a2a4\">\u6570\u636e\u94fe\u8def\u5c42<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/docs.google.com\/document\/d\/14_xSsqc6uCyLcawR2WOTfMR71x2f49ZTwtLOZgQIY3A\/edit?pli=1#heading=h.rqtv3qy7a2a4\">\u7269\u7406\u5c42<\/a><\/li>\n<\/ol>\n\n\n\n<p><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6807\u51c6\u5316\uff1a<\/strong> OSI\u6a21\u578b\u63d0\u4f9b\u4e86\u7f51\u7edc\u901a\u4fe1\u7684\u6807\u51c6\u5316\u6846\u67b6\uff0c\u5141\u8bb8\u4e0d\u540c\u7684\u7cfb\u7edf\u76f8\u4e92\u901a\u4fe1\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u534f\u8bae\u65e0\u5173\uff1a <\/strong>OSI \u6a21\u578b\u662f\u534f\u8bae\u65e0\u5173\u7684\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u4e0d\u6307\u5b9a\u7279\u5b9a\u7684\u901a\u4fe1\u534f\u8bae\uff0c\u4f46\u63d0\u4f9b\u4e86\u5f00\u53d1\u534f\u8bae\u7684\u6846\u67b6\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u901a\u7528\u7684\uff1a<\/strong> OSI \u6a21\u578b\u662f\u4e00\u4e2a\u901a\u7528\u6a21\u578b\uff0c\u9002\u7528\u4e8e\u6240\u6709\u5f62\u5f0f\u7684\u7f51\u7edc\u901a\u4fe1\uff0c\u5305\u62ec\u5c40\u57df\u7f51 (LAN) \u548c\u5e7f\u57df\u7f51 (WAN)\u3002<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXdbkgQcjDyKygMT7qDAQt3Sb06nn3m4uK-p6URxbieMqOfUKeYJ6u3z5vZZdVuU5b6-by26ps_8IIMaR32R_wmk5yqPY5BtxTgALeoBT8yOhYRE3GZmtX7dStvACbLpqE-SotSdAHkO6jatpDDDIx4OBHWa?key=kXQzw9yWML4nUFS_XH4-rw\" alt=\"Seven layers of the OSI model\"\/><\/figure>\n\n\n\n<p class=\"has-text-align-center\">\u8d44\u6599\u6765\u6e90\uff1aSiem Xpert<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-the-7-layers-of-networking\">\u7f51\u7edc\u7684 7 \u5c42<\/h3>\n\n\n\n<p>To better understand the concept of layer 2 vs layer 3 mpls VPN let&#8217;s break down the seven layers of the OSI model.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-application-layer\">\u5e94\u7528\u5c42<\/h3>\n\n\n\n<p>\u5e94\u7528\u5c42\uff0c\u5373\u7b2c\u4e03\u5c42\uff0c\u4e3a\u6700\u7ec8\u7528\u6237\u5e94\u7528\u7a0b\u5e8f\u63d0\u4f9b\u670d\u52a1\uff0c\u4f8b\u5982\u7535\u5b50\u90ae\u4ef6\u3001\u6587\u4ef6\u4f20\u8f93\u548c\u7f51\u9875\u6d4f\u89c8\u3002\u6b64\u5916\uff0c\u5b83\u8fd8\u7ba1\u7406\u5e94\u7528\u7a0b\u5e8f\u548c\u7f51\u7edc\u4e4b\u95f4\u7684\u4ea4\u4e92\uff0c\u4ee5\u786e\u4fdd\u9ad8\u6548\u7684\u6570\u636e\u4f20\u8f93\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-presentation-layer\">\u8868\u793a\u5c42<\/h3>\n\n\n\n<p>\u8868\u793a\u5c42\u5c06\u6570\u636e\u538b\u7f29\u3001\u52a0\u5bc6\u5e76\u683c\u5f0f\u5316\u4e3a\u63a5\u6536\u8bbe\u5907\u53ef\u4ee5\u7406\u89e3\u548c\u5904\u7406\u7684\u683c\u5f0f\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-session-layer\">\u4f1a\u8bdd\u5c42<\/h3>\n\n\n\n<p>\u4f1a\u8bdd\u5c42\u5efa\u7acb\u3001\u7ef4\u62a4\u548c\u7ec8\u6b62\u4e0d\u540c\u8bbe\u5907\u4e0a\u7684\u5e94\u7528\u7a0b\u5e8f\u4e4b\u95f4\u7684\u8fde\u63a5\u3002\u5b83\u7ba1\u7406\u5e94\u7528\u7a0b\u5e8f\u5bf9\u8bdd\uff0c\u5305\u62ec\u4f1a\u8bdd\u5efa\u7acb\u3001\u7ef4\u62a4\u548c\u7ec8\u6b62\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-transport-layer\">\u4f20\u8f93\u5c42<\/h3>\n\n\n\n<p>\u4f20\u8f93\u5c42\u63d0\u4f9b\u8bbe\u5907\u4e4b\u95f4\u53ef\u9760\u7684\u6570\u636e\u4f20\u8f93\u5e76\u63a7\u5236\u6570\u636e\u6d41\uff0c\u5305\u62ec\u5206\u6bb5\u3001\u786e\u8ba4\u548c\u91cd\u7ec4\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-network-layer-layer-3\">\u7f51\u7edc\u5c42\uff08\u7b2c 3 \u5c42\uff09<\/h3>\n\n\n\n<p>\u7f51\u7edc\u5c42\u8d1f\u8d23\u5728\u4e0d\u540c\u7f51\u7edc\u4e0a\u7684\u8bbe\u5907\u4e4b\u95f4\u8def\u7531\u6570\u636e\u3002\u5b83\u63d0\u4f9b\u903b\u8f91\u5bfb\u5740\u3001\u8def\u7531\u548c\u62e5\u585e\u63a7\u5236\u3002\u6b64\u5916\uff0c\u5b83\u8fd8\u7ba1\u7406\u8bbe\u5907\u4e4b\u95f4\u7684\u6570\u636e\u6d41\uff0c\u5305\u62ec\u6570\u636e\u5305\u4ea4\u6362\u548c\u8def\u7531\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-data-link-layer-layer-2\">\u6570\u636e\u94fe\u8def\u5c42\uff08\u7b2c 2 \u5c42\uff09<\/h3>\n\n\n\n<p>\u6570\u636e\u94fe\u8def\u5c42\u63d0\u4f9b\u540c\u4e00\u7f51\u7edc\u4e0a\u4e24\u4e2a\u8bbe\u5907\u4e4b\u95f4\u6570\u636e\u5e27\u7684\u65e0\u5dee\u9519\u4f20\u8f93\u3002\u6211\u7ba1\u7406\u8bbe\u5907\u4e4b\u95f4\u7684\u6570\u636e\u6d41\uff0c\u5305\u62ec\u5bfb\u5740\u3001\u6210\u5e27\u3001\u9519\u8bef\u68c0\u6d4b\u548c\u7ea0\u6b63\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-physical-layer\">\u7269\u7406\u5c42<\/h3>\n\n\n\n<p>\u7269\u7406\u5c42\u5b9a\u4e49\u4e86\u6570\u636e\u4f20\u8f93\u7684\u7269\u7406\u65b9\u5f0f\uff0c\u4f8b\u5982\u7535\u4fe1\u53f7\u3001\u5149\u6ce2\u6216\u65e0\u7ebf\u7535\u6ce2\u3002\u5b83\u6307\u5b9a\u7528\u4e8e\u901a\u4fe1\u7684\u7269\u7406\u8bbe\u5907\u548c\u4ecb\u8d28\uff0c\u4f8b\u5982\u7535\u7f06\u3001\u5149\u7ea4\u7535\u7f06\u6216\u65e0\u7ebf\u4f20\u8f93\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-is-a-virtual-lan-vlan\">\u4ec0\u4e48\u662f\u865a\u62df LAN (VLan)\uff1f<\/h3>\n\n\n\n<p><strong>VLAN\uff0c\u6216 <\/strong><a href=\"https:\/\/www.techtarget.com\/searchnetworking\/definition\/virtual-LAN\"><strong>\u865a\u62df\u5c40\u57df\u7f51<\/strong><\/a><strong>\uff0c\u903b\u8f91\u8fde\u63a5\u8bbe\u5907\uff0c\u65e0\u8bba\u7269\u7406\u4f4d\u7f6e\u5982\u4f55\uff0c\u4ee5\u63d0\u9ad8\u5b89\u5168\u6027\u548c\u6d41\u91cf\u7ba1\u7406\u3002&nbsp;<\/strong><\/p>\n\n\n\n<p>\u5b83\u4eec\u5141\u8bb8\u7f51\u7edc\u7ba1\u7406\u5458\u9694\u79bb\u90e8\u95e8\u4e4b\u95f4\u7684\u6d41\u91cf\uff0c\u800c\u65e0\u9700\u79fb\u52a8\u786c\u4ef6\u3002 VLAN \u662f\u901a\u8fc7\u6307\u5b9a\u7279\u5b9a\u7684\u4ea4\u6362\u673a\u7aef\u53e3\u5e76\u521b\u5efa\u66f4\u5c0f\u7684\u5e7f\u64ad\u57df\u6765\u5b9e\u73b0\u7684\uff0c\u4ee5\u7f13\u89e3\u7f51\u7edc\u62e5\u585e\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-is-a-layer-2-or-data-link-layer\">\u4ec0\u4e48\u662f\u7b2c 2 \u5c42\u6216\u6570\u636e\u94fe\u8def\u5c42\uff1f<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.infoblox.com\/glossary\/layer-2-of-the-osi-model-data-link-layer\">\u7b2c2\u5c42<\/a> \u4e5f\u79f0\u4e3a OSI \u6a21\u578b\u7684\u6570\u636e\u94fe\u8def\u5c42\u3002\u5b83\u4e3b\u8981\u8d1f\u8d23\u540c\u4e00\u7f51\u7edc\u4e0a\u7684\u8bbe\u5907\u4e4b\u95f4\u4f20\u8f93\u6570\u636e\u3002\u5b83\u786e\u4fdd\u7f51\u7edc\u4e0a\u8282\u70b9\u4e4b\u95f4\u7684\u65e0\u5dee\u9519\u548c\u53ef\u9760\u7684\u6570\u636e\u4f20\u8f93\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXfuL8VHvaHMS-sy6TmFElOy2XMGXliMIM5GYbwPZD7TB5bR4Fzf5CR1fXacrsE64NyIfxDVbdhLU30gaQS-hXRIxcqO-KF5S0Wqu0aU2d2_XT2R2euls6dq3x6DezixKt0vJBUMX2e21MVaPsOt8b0CS40B?key=kXQzw9yWML4nUFS_XH4-rw\" alt=\"Layer 2 Switch of OSI Model\"\/><\/figure>\n\n\n\n<p class=\"has-text-align-center\">\u6765\u6e90\uff1aOSI \u6a21\u578b\u7b2c 2 \u5c42<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-here-are-the-key-functions-of-layer-2-data-link-layer\"><strong>\u4ee5\u4e0b\u662f\u7b2c 2 \u5c42\/\u6570\u636e\u94fe\u8def\u5c42\u7684\u5173\u952e\u529f\u80fd\uff1a<\/strong><\/h3>\n\n\n\n<p>1. <strong>\u53ef\u9760\u7684\u6570\u636e\u4f20\u8f93\uff1a<\/strong> \u6570\u636e\u94fe\u8def\u5c42\u786e\u4fdd\u540c\u4e00\u7f51\u7edc\u4e0a\u7684\u8bbe\u5907\u4e4b\u95f4\u7684\u6570\u636e\u4f20\u8f93\u5230\u6b63\u786e\u7684\u76ee\u7684\u5730\u3002<\/p>\n\n\n\n<p>2. <strong>\u5e27\u683c\u5f0f\u5316<\/strong>\uff1a\u7b2c 2 \u5c42\u5c06\u6570\u636e\u683c\u5f0f\u5316\u4e3a\u5e27\uff0c\u5e76\u901a\u8fc7\u7f51\u7edc\u5c06\u5176\u4f20\u8f93\u5230\u8bbe\u5907\u3002<\/p>\n\n\n\n<p>3. <strong>Addressing:<\/strong> \u7b2c 2 \u5c42\u4f7f\u7528 MAC \u5730\u5740\u6765\u8bc6\u522b\u7f51\u7edc\u4e0a\u7684\u8bbe\u5907\uff0c\u5e76\u786e\u4fdd\u6570\u636e\u4f20\u9001\u5230\u6307\u5b9a\u5730\u5740\u7684\u8bbe\u5907\u3002<\/p>\n\n\n\n<p>4. <strong>\u6d41\u91cf\u63a7\u5236\uff1a<\/strong> \u6570\u636e\u94fe\u8def\u5c42\u8c03\u8282\u8bbe\u5907\u4e4b\u95f4\u7684\u6570\u636e\u6d41\u5e76\u9632\u6b62\u7f51\u7edc\u62e5\u585e\uff0c\u4ee5\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u6548\u7387\u3002<\/p>\n\n\n\n<p>5. <strong>\u9519\u8bef\u68c0\u6d4b\u548c\u7ea0\u6b63\uff1a<\/strong> \u7b2c 2 \u5c42\u68c0\u6d4b\u5e76\u7ea0\u6b63\u8bbe\u5907\u4e4b\u95f4\u6570\u636e\u4f20\u8f93\u671f\u95f4\u53ef\u80fd\u51fa\u73b0\u7684\u9519\u8bef\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-there-are-also-sublayer-of-layer-2-data-link-layer\"><strong>\u8fd8\u6709\u7b2c 2 \u5c42\/\u6570\u636e\u94fe\u8def\u5c42\u7684\u5b50\u5c42\uff1a<\/strong><\/h3>\n\n\n\n<p>1. <strong>\u5a92\u4f53\u8bbf\u95ee\u63a7\u5236 (MAC) \u5b50\u5c42\uff1a<\/strong> MAC\u5b50\u5c42\u63a7\u5236\u7f51\u7edc\u4ecb\u8d28\u8bbf\u95ee\u548c\u6570\u636e\u5e27\u4f20\u8f93\u3002<\/p>\n\n\n\n<p>2.<strong> \u903b\u8f91\u94fe\u8def\u63a7\u5236 (LLC) \u5b50\u5c42\uff1a <\/strong>LLC \u8d1f\u8d23\u65e0\u5dee\u9519\u7684\u6570\u636e\u4f20\u8f93\u548c\u6d41\u91cf\u63a7\u5236\u3002<\/p>\n\n\n\n<p>\u7b2c 2 \u5c42\u4f7f\u7528\u7684\u7f51\u7edc\u534f\u8bae\uff1a<\/p>\n\n\n\n<p>1. <strong>\u4ee5\u592a\u7f51\uff1a<\/strong> \u4f7f\u7528\u6570\u636e\u94fe\u8def\u5c42\u4f20\u8f93\u6570\u636e\u5e27\u7684\u5c40\u57df\u7f51 (LAN) \u901a\u7528\u534f\u8bae\u3002<\/p>\n\n\n\n<p>2. <strong>\u70b9\u5bf9\u70b9 (PPP)\uff1a<\/strong> \u7528\u4e8e\u70b9\u5bf9\u70b9\u8fde\u63a5\u7684\u534f\u8bae\uff0c\u4f8b\u5982\u62e8\u53f7 Internet \u8fde\u63a5\u3002<\/p>\n\n\n\n<p>3. <strong>\u5e27\u4e2d\u7ee7\uff1a<\/strong> \u8be5\u534f\u8bae\u901a\u5e38\u4f7f\u7528\u5e7f\u57df\u7f51 (WAN) \u5185\u7684\u6570\u636e\u94fe\u8def\u5c42\u4f20\u8f93\u6570\u636e\u3002<\/p>\n\n\n\n<p><strong>\u6982\u62ec<\/strong>\uff1aOSI \u6a21\u578b\u7684\u6570\u636e\u94fe\u8def\u5c42\u6216\u7b2c 2 \u5c42\u8d1f\u8d23\u5728\u540c\u4e00\u7f51\u7edc\u4e0a\u7684\u8bbe\u5907\u4e4b\u95f4\u4f20\u8f93\u6570\u636e\u3002\u5b83\u786e\u4fdd\u53ef\u9760\u4e14\u65e0\u5dee\u9519\u7684\u6570\u636e\u4f20\u8f93\u3001\u683c\u5f0f\u5316\u4e3a\u5e27\u4ee5\u53ca\u5bfb\u5740\u7f51\u7edc\u4e0a\u7684\u8bbe\u5907\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-is-layer-3-or-network-layer\">\u4ec0\u4e48\u662f\u7b2c 3 \u5c42\u6216\u7f51\u7edc\u5c42\uff1f<\/h3>\n\n\n\n<p>\u7f51\u7edc\u5c42\uff0c\u4e5f\u79f0\u4e3a <a href=\"https:\/\/www.infoblox.com\/glossary\/layer-3-of-the-osi-model-network-layer\/\">\u7b2c3\u5c42<\/a> \u5728OSI\u6a21\u578b\u4e2d\uff0c\u6709\u5229\u4e8e\u53ef\u53d8\u957f\u5ea6\u6570\u636e\u5e8f\u5217\u7684\u4f20\u8f93\u3002&nbsp;<\/p>\n\n\n\n<p>\u5b83\u901a\u8fc7\u63d0\u4f9b\u4ece\u4e00\u4e2a\u7f51\u7edc\u4e0a\u7684\u6e90\u4e3b\u673a\u5230\u4e0d\u540c\u7f51\u7edc\u4e0a\u7684\u76ee\u6807\u4e3b\u673a\u7684\u529f\u80fd\u548c\u8fc7\u7a0b\u673a\u5236\u6765\u5b9e\u73b0\u8fd9\u4e00\u70b9\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXeJD6FTvkhR7JWGRZksFKtDo7Ru9B7xwGA5bpbe_VrYSi32hHX-xEEW7QPFINQeCBaeMe4Jpc3A9T-6P3N0XHRblb6GWu1eoFgf2RcRXukywfo8LOtcUVyIpa6gQQ_cAgnTzVF09tP1FzmObnwZXIBL0q0?key=kXQzw9yWML4nUFS_XH4-rw\" alt=\"Layer 3 Switch of OSI Model\"\/><\/figure>\n\n\n\n<p class=\"has-text-align-center\">\u6765\u6e90\uff1aOSI \u6a21\u578b\u7b2c 3 \u5c42<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-key-functions-of-layer-3-or-network-layer\"><strong>\u7b2c 3 \u5c42\u6216\u7f51\u7edc\u5c42\u7684\u4e3b\u8981\u529f\u80fd\uff1a<\/strong><\/h3>\n\n\n\n<p><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u8def\u7531\uff1a<\/strong> \u7f51\u7edc\u5c42\u5904\u7406\u4e0d\u540c\u7f51\u7edc\u4e4b\u95f4\u7684\u6570\u636e\u5305\u3002\u5b83\u51b3\u5b9a\u6570\u636e\u4ece\u6e90\u5230\u76ee\u7684\u5730\u7684\u4f20\u8f93\u8def\u5f84\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u788e\u7247\u548c\u91cd\u7ec4\uff1a<\/strong> \u5982\u679c\u6570\u636e\u5305\u592a\u5927\u800c\u65e0\u6cd5\u901a\u8fc7\u7279\u5b9a\u7f51\u7edc\u4f20\u8f93\uff0c\u7f51\u7edc\u5c42\u53ef\u80fd\u4f1a\u5c06\u6570\u636e\u5305\u5206\u6bb5\u6210\u66f4\u5c0f\u7684\u6570\u636e\u5305\u3002\u5b83\u8fd8\u5728\u76ee\u7684\u5730\u91cd\u65b0\u7ec4\u88c5\u6570\u636e\u5305\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u9519\u8bef\u5904\u7406\uff1a<\/strong> \u7f51\u7edc\u5c42\u5411\u4f20\u8f93\u5c42\u62a5\u544a\u4f20\u9001\u9519\u8bef\uff0c\u5e76\u53ef\u80fd\u8bf7\u6c42\u91cd\u4f20\u4e22\u5931\u6216\u635f\u574f\u7684\u6570\u636e\u5305\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u903b\u8f91\u5bfb\u5740\uff1a<\/strong> \u7f51\u7edc\u5c42\u4e3a\u7f51\u7edc\u4e0a\u7684\u8bbe\u5907\u5206\u914d\u903b\u8f91\u5730\u5740\uff0c\u7528\u4e8e\u8def\u7531\u6570\u636e\u5305<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-here-are-some-sub-layers-of-layer-3-network-layer\"><strong>\u4ee5\u4e0b\u662f\u7b2c 3 \u5c42\/\u7f51\u7edc\u5c42\u7684\u4e00\u4e9b\u5b50\u5c42\uff1a<\/strong><\/h3>\n\n\n\n<p>1. <strong>\u5b50\u7f51\u8bbf\u95ee\uff1a<\/strong> \u5b83\u5904\u7406\u5e72\u6270\u7f51\u7edc\u7684\u534f\u8bae\uff0c\u4f8b\u5982 X.25<\/p>\n\n\n\n<p>2. <strong>\u5b50\u7f51\u76f8\u5173\u6536\u655b\uff1a<\/strong> \u5f53\u9700\u8981\u5c06\u4f20\u8f93\u7f51\u7edc\u7684\u7ea7\u522b\u63d0\u5347\u5230\u4e24\u4fa7\u7f51\u7edc\u7684\u7ea7\u522b\u65f6\uff0c\u4f7f\u7528\u5b50\u5c42\u3002<\/p>\n\n\n\n<p>3. <strong>\u5b50\u7f51\u72ec\u7acb\u6536\u655b\uff1a<\/strong> \u8be5\u5c42\u8de8\u591a\u4e2a\u7f51\u7edc\u8fdb\u884c\u4f20\u8f93\uff0c\u4f8b\u5982 CLNP\uff08\u65e0\u8fde\u63a5\u7f51\u7edc\u534f\u8bae\uff09\u6216 IPv7\u3002<\/p>\n\n\n\n<p><strong>\u6982\u62ec<\/strong>\uff1a\u7f51\u7edc\u5c42\u6216\u7b2c 3 \u5c42\u4e3b\u8981\u8d1f\u8d23\u8def\u7531\u3001\u5206\u6bb5\u548c\u91cd\u7ec4\u6570\u636e\u5305\u3001\u9519\u8bef\u5904\u7406\u548c\u903b\u8f91\u5bfb\u5740\u3002\u5b83\u5728\u786e\u4fdd\u6570\u636e\u6b63\u786e\u4f20\u9012\u65b9\u9762\u53d1\u6325\u7740\u81f3\u5173\u91cd\u8981\u7684\u4f5c\u7528\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-is-an-mpls-vpn\">\u4ec0\u4e48\u662f MPLS VPN\uff1f<\/h2>\n\n\n\n<p>\u4e00\u4e2a <a href=\"https:\/\/nordvpn.com\/blog\/mpls-vpn\/\">\u591a\u534f\u8bae\u6807\u7b7e\u4ea4\u6362VPN<\/a> \uff08\u591a\u534f\u8bae\u6807\u7b7e\u4ea4\u6362\u865a\u62df\u4e13\u7528\u7f51\u7edc\uff09\u662f\u5229\u7528\u591a\u534f\u8bae\u6807\u7b7e\u4ea4\u6362\uff08MPLS\uff09\u6280\u672f\u7684\u865a\u62df\u4e13\u7528\u7f51\u7edc\u3002<\/p>\n\n\n\n<p>VPN \u63d0\u4f9b\u5546\u548c Internet \u670d\u52a1\u63d0\u4f9b\u5546 (ISP) \u4f7f\u7528 MPLS VPN\uff0c\u56e0\u4e3a\u5b83\u4eec\u53ef\u4ee5\u4e3a\u5176\u5ba2\u6237\u63d0\u4f9b\u5b89\u5168\u53ef\u9760\u7684\u8fde\u63a5\u3002&nbsp;<\/p>\n\n\n\n<p>\u8fd9\u4e9b VPN \u4f7f\u7528\u5148\u8fdb\u7684\u7f51\u7edc\u6280\u672f\u6765\u521b\u5efa\u548c\u7ba1\u7406 VPN \u73af\u5883\u4e2d\u7684\u901a\u4fe1\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-why-use-the-mpls-network\">\u4e3a\u4ec0\u4e48\u4f7f\u7528 MPLS \u7f51\u7edc\uff1f<\/h2>\n\n\n\n<p><strong>MPLS VPN \u7684\u4e3b\u8981\u4f18\u70b9\u662f\u5176\u5b89\u5168\u53ef\u9760\u7684\u8fde\u63a5\u3002 <\/strong>\u7ec4\u7ec7\u53ef\u4ee5\u5728\u8fdc\u7a0b\u7ad9\u70b9\u4e4b\u95f4\u5efa\u7acb\u79c1\u6709\u4e14\u53d7\u63a7\u7684\u901a\u4fe1\u901a\u9053\uff0c\u786e\u4fdd\u5176\u6d41\u91cf\u6839\u636e\u5176\u7279\u5b9a\u8981\u6c42\u8fdb\u884c\u8def\u7531\u3002&nbsp;<\/p>\n\n\n\n<p>\u5bfb\u6c42\u63a7\u5236\u6570\u636e\u548c\u7f51\u7edc\u57fa\u7840\u8bbe\u65bd\u7684\u7ec4\u7ec7\u53ef\u4ee5\u5229\u7528 MPLS VPN\uff0c\u56e0\u4e3a\u5b83\u4eec\u63d0\u4f9b\u9ad8\u6c34\u5e73\u7684\u63a7\u5236\u548c\u9690\u79c1\u3002<\/p>\n\n\n\n<p>\u6b64\u5916\uff0cMPLS VPN \u63d0\u4f9b\u9ad8\u6c34\u5e73\u7684\u81ea\u5b9a\u4e49\u529f\u80fd\uff0c\u5141\u8bb8\u7ec4\u7ec7\u6839\u636e\u5176\u72ec\u7279\u9700\u6c42\u5b9a\u5236\u670d\u52a1\u3002&nbsp;<\/p>\n\n\n\n<p>\u8fd9\u79cd\u7075\u6d3b\u6027\u4f7f\u4f01\u4e1a\u80fd\u591f\u4f18\u5316\u7f51\u7edc\u6027\u80fd\u3001\u786e\u4fdd\u6570\u636e\u9690\u79c1\u5e76\u7ef4\u6301\u4e25\u683c\u7684\u8bbf\u95ee\u63a7\u5236\uff0c\u540c\u65f6\u53d7\u76ca\u4e8e\u6258\u7ba1 VPN \u670d\u52a1\u56fa\u6709\u7684\u53ef\u6269\u5c55\u6027\u548c\u6210\u672c\u6548\u76ca\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-mpls-vs-vpn\">MPLS \u4e0e VPN<\/h2>\n\n\n\n<p>MPLS\uff08\u591a\u534f\u8bae\u6807\u7b7e\u4ea4\u6362\uff09\u548c VPN \u662f\u7528\u4e8e\u5728\u8bbe\u5907\u6216\u7f51\u7edc\u4e4b\u95f4\u5efa\u7acb\u79c1\u6709\u4e14\u5b89\u5168\u7684\u8fde\u63a5\u7684\u4e24\u79cd\u6280\u672f\u3002&nbsp;<\/p>\n\n\n\n<p>\u5c3d\u7ba1\u8fd9\u4e24\u79cd\u6280\u672f\u90fd\u63d0\u4f9b\u5b89\u5168\u548c\u79c1\u5bc6\u7684\u8fde\u63a5\uff0c\u4f46\u5b83\u4eec\u7684\u64cd\u4f5c\u65b9\u5f0f\u4e0d\u540c\uff0c\u5e76\u4e14\u5177\u6709\u72ec\u7279\u7684\u4f18\u70b9\u548c\u7f3a\u70b9\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>              <strong>Key Factors<\/strong><\/td><td>                   <strong>\u591a\u534f\u8bae\u6807\u7b7e\u4ea4\u6362<\/strong><\/td><td class=\"has-text-align-left\" data-align=\"left\">                       <strong>\u865a\u62df\u4e13\u7528\u7f51<\/strong><\/td><\/tr><tr><td>\u6280\u672f<\/td><td>MPLS \u662f\u4e00\u79cd\u4f7f\u7528\u6807\u7b7e\u6765\u8def\u7531\u6570\u636e\u5305\u7684\u534f\u8bae<\/td><td class=\"has-text-align-left\" data-align=\"left\">VPN \u662f\u4e00\u79cd\u4f7f\u7528\u52a0\u5bc6\u548c\u96a7\u9053\u521b\u5efa\u5b89\u5168\u8fde\u63a5\u7684\u6280\u672f<\/td><\/tr><tr><td>\u5b89\u5168<\/td><td>MPLS\u4e0d\u63d0\u4f9b\u4efb\u4f55\u52a0\u5bc6<\/td><td class=\"has-text-align-left\" data-align=\"left\">VPN \u4f7f\u7528\u5f3a\u52a0\u5bc6\u6765\u4fdd\u62a4\u6570\u636e\u4f20\u8f93<\/td><\/tr><tr><td>\u7075\u6d3b\u6027<\/td><td>MPLS\u7075\u6d3b\u6027\u8f83\u5dee\uff0c\u5bf9\u5404\u79cd\u786c\u4ef6\u548c\u64cd\u4f5c\u7cfb\u7edf\u7684\u517c\u5bb9\u6027\u8f83\u5dee<\/td><td class=\"has-text-align-left\" data-align=\"left\">VPN\u66f4\u52a0\u7075\u6d3b\uff0c\u517c\u5bb9\u591a\u79cd\u8bbe\u5907\u548c\u64cd\u4f5c\u7cfb\u7edf<\/td><\/tr><tr><td>\u53ef\u9760\u6027<\/td><td>MPLS \u901a\u5e38\u662f\u4e00\u79cd\u66f4\u53ef\u9760\u7684 VPN\uff0c\u56e0\u4e3a\u5b83\u8f83\u5c11\u4f9d\u8d56\u516c\u5171\u4e92\u8054\u7f51<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u76f8\u5bf9\u6765\u8bf4\u4e0d\u592a\u53ef\u9760<\/td><\/tr><tr><td>\u8868\u73b0<\/td><td>MPLS provides better performance as it\u2019s optimized for large-scale networks<\/td><td class=\"has-text-align-left\" data-align=\"left\">VPN \u5728\u5c0f\u578b\u7f51\u7edc\u4e2d\u63d0\u4f9b\u826f\u597d\u7684\u6027\u80fd<\/td><\/tr><tr><td>\u53ef\u6269\u5c55\u6027<\/td><td>MPLS \u66f4\u5177\u53ef\u6269\u5c55\u6027\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u5904\u7406\u591a\u4e2a\u4f4d\u7f6e\u7684\u5927\u91cf\u6d41\u91cf<\/td><td class=\"has-text-align-left\" data-align=\"left\">VPN \u7684\u53ef\u6269\u5c55\u6027\u8f83\u5dee\uff0c\u56e0\u4e3a\u5b83\u4eec\u5728\u8f83\u5c0f\u7684\u7f51\u7edc\u4e0a\u8fd0\u884c\u3002<\/td><\/tr><tr><td>\u7ba1\u7406<\/td><td>MPLS\u9700\u8981\u66f4\u590d\u6742\u7684\u7ba1\u7406\u548c\u914d\u7f6e<\/td><td class=\"has-text-align-left\" data-align=\"left\">VPN \u76f8\u5bf9\u66f4\u5bb9\u6613\u914d\u7f6e\uff0c\u4efb\u4f55\u6ca1\u6709\u6280\u672f\u77e5\u8bc6\u7684\u4eba\u90fd\u53ef\u4ee5\u7ba1\u7406\u3002<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-when-to-use-each\">\u4f55\u65f6\u4f7f\u7528\u6bcf\u4e2a\uff1f<\/h3>\n\n\n\n<p><strong>\u591a\u534f\u8bae\u6807\u7b7e\u4ea4\u6362<\/strong>\uff1a\u5f53\u60a8\u9700\u8981\u4e3a\u5927\u578b\u7f51\u7edc\u63d0\u4f9b\u9ad8\u901f\u3001\u53ef\u9760\u4e14\u53ef\u6269\u5c55\u7684\u8fde\u63a5\u65f6\uff0c\u8bf7\u4f7f\u7528 MPLS\u3002\u9002\u7528\u4e8e\u7f51\u7edc\u57fa\u7840\u8bbe\u65bd\u590d\u6742\u3001\u5e26\u5bbd\u8981\u6c42\u9ad8\u7684\u7ec4\u7ec7\u3002<\/p>\n\n\n\n<p><strong>\u865a\u62df\u4e13\u7528\u7f51<\/strong>\uff1a\u5f53\u60a8\u9700\u8981\u5b89\u5168\u7075\u6d3b\u7684\u8fde\u63a5\u6765\u8fdb\u884c\u8fdc\u7a0b\u8bbf\u95ee\u6216\u5c0f\u578b\u7f51\u7edc\u65f6\uff0c\u8bf7\u4f7f\u7528 VPN\u3002\u5b83\u9002\u5408\u9884\u7b97\u548c\u57fa\u7840\u8bbe\u65bd\u6709\u9650\u7684\u7ec4\u7ec7\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-is-vpn-a-layer-2-or-layer-3\">VPN \u662f\u7b2c 2 \u5c42\u8fd8\u662f\u7b2c 3 \u5c42\uff1f<\/h2>\n\n\n\n<p><strong>\u7b2c 2 \u5c42 VPN\uff0c\u4e5f\u79f0\u4e3a\u865a\u62df\u4e13\u7528 LAN \u670d\u52a1 (VPLS)\uff0c\u7528\u4e8e\u5728\u4e0d\u540c\u7ad9\u70b9\u4e4b\u95f4\u4f20\u8f93\u7b2c 2 \u5c42\u534f\u8bae\uff0c\u4f8b\u5982\u4ee5\u592a\u7f51\u5e27\u3002&nbsp;<\/strong><\/p>\n\n\n\n<p>\u5b83\u901a\u8fc7\u8fde\u63a5\u548c\u5171\u4eab VLAN \u4fc3\u8fdb\u654f\u611f\u4fe1\u606f\u7684\u901a\u4fe1\u3002\u7b2c 2 \u5c42 VPN \u5728\u56fd\u5bb6\u529e\u4e8b\u5904\u4e4b\u95f4\u5efa\u7acb\u901a\u4fe1\uff0c\u5c06\u8fdc\u7a0b\u7ad9\u70b9\u8fde\u63a5\u5230\u4e2d\u592e\u4f4d\u7f6e\u5e76\u94fe\u63a5\u591a\u4e2a\u7ad9\u70b9\u3002<\/p>\n\n\n\n<p>\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u7b2c 3 \u5c42 VPN\uff08\u4e5f\u79f0\u4e3a\u865a\u62df\u4e13\u7528\u8def\u7531\u7f51\u7edc (VPRN)\uff09\u5728\u7f51\u7edc\u5c42\u8fd0\u884c\uff0c\u5e76\u4f7f\u7528 IP \u5730\u5740\u5728\u7ad9\u70b9\u4e4b\u95f4\u8def\u7531\u6d41\u91cf\u3002&nbsp;<\/p>\n\n\n\n<p>\u5b83\u4eec\u4e3b\u8981\u5728 VPN \u57fa\u7840\u8bbe\u65bd\u7684\u540e\u7aef\u4f20\u8f93\u6570\u636e\uff0c\u4f8b\u5982\u540e\u53f0\u6216\u6570\u636e\u4e2d\u5fc3\u4e4b\u95f4\u7684 VPN \u8fde\u63a5\u3002&nbsp;<\/p>\n\n\n\n<p>\u7b2c 3 \u5c42 VPN \u65e8\u5728\u4fdd\u62a4\u4e0d\u540c\u5730\u533a\u7684\u8fdc\u7a0b\u5de5\u4f5c\u4eba\u5458\u3001\u4f9b\u5e94\u5546\u6216\u529e\u516c\u5ba4\u7684\u70b9\u5bf9\u70b9\u8fde\u63a5\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-why-use-layer-2-vpn\">\u4e3a\u4ec0\u4e48\u4f7f\u7528\u7b2c 2 \u5c42 VPN\uff1f<\/h3>\n\n\n\n<p>\u7b2c 2 \u5c42 VPN \u63d0\u4f9b\u4f4e\u5ef6\u8fdf\u3001\u9ad8\u6027\u80fd\u548c\u53ef\u6269\u5c55\u6027\u3002\u5b83\u9002\u7528\u4e8e\u9700\u8981\u4f4e\u5ef6\u8fdf\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u4f8b\u5982\u6e38\u620f\u3001VoIP \u547c\u53eb\u3001\u89c6\u9891\u4f1a\u8bae\u3001\u7f51\u7edc\u865a\u62df\u5316\u7b49\u3002\u7b2c 2 \u5c42 VPN \u8fd8\u901a\u8fc7\u65e0\u7f1d\u96c6\u6210\u548c\u9ad8\u901f\u6570\u636e\u4f20\u8f93\u63d0\u4f9b\u9ad8\u6027\u80fd\u3002&nbsp;<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-why-use-layer-3-vpn\">\u4e3a\u4ec0\u4e48\u4f7f\u7528\u7b2c 3 \u5c42 VPN\uff1f<\/h3>\n\n\n\n<p>\u7b2c 3 \u5c42 VPN \u63d0\u4f9b\u66f4\u597d\u7684\u5b89\u5168\u6027\u3001\u7075\u6d3b\u6027\u548c\u53ef\u6269\u5c55\u6027\u3002\u5b83\u4eec\u9002\u7528\u4e8e\u9700\u8981\u9ad8\u5b89\u5168\u6027\u7684\u5e94\u7528\uff0c\u4f8b\u5982\u4e2a\u4eba\u8eab\u4efd\u4fe1\u606f (PII)\u3001\u4e2a\u4eba\u5065\u5eb7\u4fe1\u606f\u6216\u673a\u5bc6\u4fe1\u606f\u3002\u8fd9\u4e9b VPN \u8fd8\u5177\u6709\u7075\u6d3b\u6027\u548c\u53ef\u6269\u5c55\u6027\uff0c\u9002\u7528\u4e8e\u5927\u578b\u7f51\u7edc\u548c\u4f01\u4e1a\u3002<\/p>\n\n\n\n<p>VPN \u534f\u8bae\u4e5f\u76f4\u63a5\u5f71\u54cd VPN \u6027\u80fd\u3002\u4e00\u4e9b\u4e3b\u8981\u534f\u8bae\uff0c\u4f8b\u5982 <a href=\"https:\/\/symlexvpn.com\/zh\/wireguard-openvpn-shadowsocks-comparison-in-a-vpn\/\">WireGuard\u3001OpenVPN\u3001Shadowsocks<\/a>\u7b49\uff0c\u88ab\u5e7f\u6cdb\u7528\u4e8e\u4f18\u5316\u548c\u5b89\u5168\u7684\u4f53\u9a8c\u3002\u786e\u4fdd\u60a8\u5df2\u9009\u62e9\u9002\u5408\u60a8\u9700\u6c42\u7684 VPN\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-frequently-asked-questions-faqs\">\u5e38\u89c1\u95ee\u9898 (FAQ)<\/h2>\n\n\n\n<p><\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-can-layer-2-and-layer-3-vpns-be-used-together\">\u4e8c\u5c42\u548c\u4e09\u5c42VPN\u53ef\u4ee5\u4e00\u8d77\u4f7f\u7528\u5417\uff1f<\/h4>\n\n\n\n<p>\u7b2c 2 \u5c42\u548c\u7b2c 3 \u5c42 VPN \u786e\u5b9e\u53ef\u4ee5\u4e00\u8d77\u4f7f\u7528\uff0c\u4f7f\u7ec4\u7ec7\u80fd\u591f\u5b9e\u73b0\u66f4\u5168\u9762\u3001\u591a\u6837\u5316\u548c\u7075\u6d3b\u7684\u7f51\u7edc\u57fa\u7840\u8bbe\u65bd\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"h-what-are-the-benefits-of-combining-layer-2-and-layer-3-vpns\">\u7ed3\u5408\u7b2c 2 \u5c42\u548c\u7b2c 3 \u5c42 VPN \u6709\u54ea\u4e9b\u597d\u5904\uff1f<\/h4>\n\n\n\n<p>\u5c06\u7b2c 2 \u5c42\u548c\u7b2c 3 \u5c42 VPN \u7ed3\u5408\u8d77\u6765\u53ef\u80fd\u4f1a\u5e26\u6765\u6f5c\u5728\u7684\u597d\u5904\uff0c\u4f8b\u5982\u6539\u8fdb\u7684\u6027\u80fd\u3001\u53ef\u6269\u5c55\u6027\u3001\u5b89\u5168\u6027\u3001\u5b9a\u5236\u89e3\u51b3\u65b9\u6848\u548c\u7075\u6d3b\u6027\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-conclusion\">\u7ed3\u8bba<\/h2>\n\n\n\n<p>Hope you\u2019re now clear about <strong>\u7b2c 2 \u5c42\u4e0e\u7b2c 3 \u5c42 VPN\u3002&nbsp;<\/strong><\/p>\n\n\n\n<p>\u7b2c 2 \u5c42\u5728 OSI 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Key Takeaways: Layer 2 Layer 3 Layer 2 and Layer 3 are responsible for network communication between different devices. Both layers have their own characteristics, advantages, and disadvantages. Let&#8217;s discuss layer 2 vs layer 3 vpn in detail. Layer [&hellip;]<\/p>","protected":false},"author":2,"featured_media":11889,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-11881","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-network"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.4 (Yoast SEO v26.4) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Symlex VPN | Layer 2 vs Layer 3 VPN - Know the Difference<\/title>\n<meta name=\"description\" content=\"Want to know about layer 2 vs. layer 3 VPN? 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