{"id":7106,"date":"2025-10-09T08:30:21","date_gmt":"2025-10-08T23:30:21","guid":{"rendered":"https:\/\/blog.since2020.jp\/?p=7106"},"modified":"2026-09-29T14:50:59","modified_gmt":"2026-09-29T05:50:59","slug":"datalink-layer_glossary","status":"publish","type":"post","link":"https:\/\/since2020.jp\/media\/datalink-layer_glossary\/","title":{"rendered":"\u30c7\u30fc\u30bf\u30ea\u30f3\u30af\u5c64\u518d\u8003\uff1a\u901a\u4fe1\u306e\u201c\u898b\u3048\u3056\u308b\u57fa\u76e4\u201d\u3092\u652f\u3048\u308b\u6700\u65b0\u6280\u8853\u3068\u5b9f\u8df5"},"content":{"rendered":"\n<p>\u30c7\u30fc\u30bf\u30ea\u30f3\u30af\u5c64\uff08Layer 2\uff09\u306e\u57fa\u672c\u304b\u3089Ethernet\u3001Wi-Fi 7\u3001VLAN\u3001MACsec\u3001TSN\u307e\u3067\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3002IoT\u30fb\u81ea\u52d5\u8eca\u30fb\u30c7\u30fc\u30bf\u30bb\u30f3\u30bf\u30fc\u30fb\u30bc\u30ed\u30c8\u30e9\u30b9\u30c8\u6642\u4ee3\u306b\u304a\u3051\u308bLayer 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3\u306b\u76ee\u304c\u5411\u304d\u304c\u3061\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u5b9f\u969b\u306b\u7aef\u672b\u540c\u58eb\u3092\u3064\u306a\u304e\u3001\u30c7\u30fc\u30bf\u3092\u300c\u30d5\u30ec\u30fc\u30e0\u300d\u3068\u3057\u3066\u5c4a\u3051\u308b\u571f\u53f0\u304c\u30c7\u30fc\u30bf\u30ea\u30f3\u30af\u5c64\u3067\u3059\u3002<\/p>\n<p>OSI\u53c2\u7167\u30e2\u30c7\u30eb\u306e\u7b2c2\u5c64\u306b\u4f4d\u7f6e\u3059\u308b\u30c7\u30fc\u30bf\u30ea\u30f3\u30af\u5c64\u306f\u3001\u540c\u4e00\u30ea\u30f3\u30af\u4e0a\u306b\u3042\u308b\u6a5f\u5668\u9593\u306e\u901a\u4fe1\u3092\u62c5\u5f53\u3057\u307e\u3059\u3002\u4ee3\u8868\u7684\u306a\u5f79\u5272\u306f\u3001\u30d5\u30ec\u30fc\u30e0\u5316\u3001MAC\u30a2\u30c9\u30ec\u30b9\u306b\u3088\u308b\u8b58\u5225\u3001\u8aa4\u308a\u691c\u51fa\u3001\u5a92\u4f53\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u306a\u3069\u3067\u3059\u3002Ethernet\uff08IEEE 802.3\uff09\u3084Wi-Fi\uff08IEEE 802.11\uff09\u304c\u4ee3\u8868\u4f8b\u3067\u3042\u308a\u3001\u73fe\u5728\u306e\u4f01\u696d\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3084\u30c7\u30fc\u30bf\u30bb\u30f3\u30bf\u30fc\u3001\u5bb6\u5ead\u5185LAN\u306e\u591a\u304f\u304c\u3053\u306e\u4ed5\u7d44\u307f\u3092\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001\u300c\u30c7\u30fc\u30bf\u30ea\u30f3\u30af\u5c64\uff1d\u6614\u306a\u304c\u3089\u306eLAN\u300d\u3068\u3044\u3046\u7406\u89e3\u3067\u306f\u4e0d\u5341\u5206\u3067\u3059\u3002\u73fe\u5728\u306eLayer 2\u306f\u3001\u9ad8\u901fEthernet\u3001Wi-Fi 7\u3001VLAN\u3001MACsec\u3001TSN\u3001\u4eee\u60f3\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306a\u3069\u3068\u7d50\u3073\u4ed8\u304d\u3001\u30af\u30e9\u30a6\u30c9\u3001AI\u30c7\u30fc\u30bf\u30bb\u30f3\u30bf\u30fc\u3001\u5de5\u5834\u3001\u81ea\u52d5\u8eca\u307e\u3067\u652f\u3048\u308b\u9ad8\u5ea6\u306a\u901a\u4fe1\u57fa\u76e4\u3078\u3068\u767a\u5c55\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><!-- notionvc: 275658ff-fa9f-48cf-aec9-ea7a37f70daa --><\/p>\n<h2>\u30c7\u30fc\u30bf\u30ea\u30f3\u30af\u5c64\u306f\u4f55\u3092\u3057\u3066\u3044\u308b\u306e\u304b\uff1f<\/h2>\n<p>\u30c7\u30fc\u30bf\u30ea\u30f3\u30af\u5c64\u306f\u5927\u304d\u304fMAC\uff08Media Access Control\uff09\u3068LLC\uff08Logical Link Control\uff09\u3068\u3044\u3046\u8003\u3048\u65b9\u3067\u6574\u7406\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>MAC\u306f\u3001MAC\u30a2\u30c9\u30ec\u30b9\u3092\u5229\u7528\u3057\u305f\u30d5\u30ec\u30fc\u30e0\u914d\u9001\u3084\u5a92\u4f53\u3078\u306e\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u3092\u62c5\u3046\u90e8\u5206\u3067\u3059\u3002\u4e00\u65b9\u3001LLC\u306f\u4e0a\u4f4d\u5c64\u3068\u306e\u8ad6\u7406\u7684\u306a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u73fe\u5728\u306e\u5b9f\u52d9\u3067\u306f\u3001\u7279\u306bEthernet\u3084Wi-Fi\u306a\u3069\u306eMAC\u6a5f\u80fd\u3001\u30b9\u30a4\u30c3\u30c1\u30f3\u30b0\u3001VLAN\u3001QoS\u3068\u3044\u3063\u305f\u4ed5\u7d44\u307f\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<p>Ethernet\u3067\u306f\u3001\u304b\u3064\u3066\u5171\u6709\u5a92\u4f53\u3067CSMA\/CD\u306b\u3088\u308b\u885d\u7a81\u5236\u5fa1\u304c\u91cd\u8981\u3067\u3057\u305f\u3002\u3057\u304b\u3057\u73fe\u5728\u306e\u30b9\u30a4\u30c3\u30c1\u30c9Ethernet\u3067\u306f\u5168\u4e8c\u91cd\u901a\u4fe1\u304c\u4e00\u822c\u7684\u3067\u3042\u308a\u3001\u300c\u885d\u7a81\u3092\u907f\u3051\u306a\u304c\u3089\u5171\u6709\u56de\u7dda\u3092\u4f7f\u3046\u300d\u3068\u3044\u3046\u6614\u306eEthernet\u50cf\u3060\u3051\u3067\u306f\u73fe\u72b6\u3092\u8aac\u660e\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>\u3055\u3089\u306bIEEE 802.3\u3067\u306f\u3001200Gbps\u3001400Gbps\u3001800Gbps\u30011.6Tbps\u7d1aEthernet\u3092\u5bfe\u8c61\u3068\u3057\u305fP802.3dj\u306e\u6a19\u6e96\u5316\u4f5c\u696d\u304c2026\u5e74\u306b\u3082\u9032\u884c\u3057\u3066\u3044\u307e\u3059\u3002AI\u30fbHPC\u5411\u3051\u30c7\u30fc\u30bf\u30bb\u30f3\u30bf\u30fc\u3067\u306f\u3001Layer 2\u3092\u542b\u3080\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u57fa\u76e4\u305d\u306e\u3082\u306e\u304c\u9ad8\u901f\u5316\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306b\u306a\u3089\u306a\u3044\u3053\u3068\u304c\u91cd\u8981\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><!-- notionvc: 82315f39-1fd4-4b16-8dbe-3e22f370e3d4 --><\/p>\n<h2>VLAN\u304b\u3089Wi-Fi 7\u3078\u2015\u2015Layer 2\u306f\u5927\u304d\u304f\u9032\u5316\u3057\u3066\u3044\u308b<\/h2>\n<p>\u4f01\u696d\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u6b20\u304b\u305b\u306a\u3044\u306e\u304cVLAN\u3067\u3059\u3002IEEE 802.1Q\u306b\u3088\u3063\u3066\u3001\u7269\u7406\u7684\u306b\u306f\u540c\u3058\u30b9\u30a4\u30c3\u30c1\u3092\u5229\u7528\u3057\u306a\u304c\u3089\u3001\u8ad6\u7406\u7684\u306b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u5206\u96e2\u3067\u304d\u307e\u3059\u3002\u90e8\u7f72\u3084\u7528\u9014\u3001IoT\u6a5f\u5668\u3001\u30b2\u30b9\u30c8\u7aef\u672b\u306a\u3069\u3092\u5206\u3051\u308b\u3053\u3068\u3067\u3001\u901a\u4fe1\u5236\u5fa1\u3084\u904b\u7528\u7ba1\u7406\u3092\u884c\u3044\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u7121\u7dda\u5074\u3067\u3082Layer 2\u306e\u9032\u5316\u306f\u7d9a\u3044\u3066\u3044\u307e\u3059\u3002Wi-Fi 7\u3068\u3057\u3066\u77e5\u3089\u308c\u308bIEEE 802.11be-2024\u306f2025\u5e747\u6708\u306b\u6b63\u5f0f\u767a\u884c\u3055\u308c\u3001\u9ad8\u30b9\u30eb\u30fc\u30d7\u30c3\u30c8\u3060\u3051\u3067\u306a\u304f\u3001\u4f4e\u9045\u5ef6\u3084\u901a\u4fe1\u52b9\u7387\u306e\u5411\u4e0a\u3092\u610f\u8b58\u3057\u305f\u4ed5\u69d8\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3055\u3089\u306b2025\u5e74\u306b\u306fWLAN\u30bb\u30f3\u30b7\u30f3\u30b0\u3092\u6271\u3046802.11bf\u3082\u767a\u884c\u3055\u308c\u307e\u3057\u305f\u30022026\u5e74\u306b\u306f\u3001\u3088\u308a\u9ad8\u3044\u4fe1\u983c\u6027\u3092\u76ee\u6307\u3059802.11bn\u3084\u3001\u30d7\u30e9\u30a4\u30d0\u30b7\u30fc\u5f37\u5316\u3092\u6271\u3046802.11bi\u306a\u3069\u306e\u6a19\u6e96\u5316\u3082\u9032\u884c\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u91cd\u8981\u306a\u306e\u306f\u3001Wi-Fi\u3092\u5358\u7d14\u306a\u300c\u7121\u7dda\u7248Ethernet\u300d\u3068\u8003\u3048\u306a\u3044\u3053\u3068\u3067\u3059\u3002\u96fb\u6ce2\u5e72\u6e09\u3001\u7aef\u672b\u5bc6\u5ea6\u3001\u30ed\u30fc\u30df\u30f3\u30b0\u3001QoS\u306a\u3069\u3001\u7121\u7dda\u7279\u6709\u306e\u6761\u4ef6\u3092MAC\u5c64\u3067\u8003\u616e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4eca\u5f8c\u306f\u6709\u7ddaEthernet\u3068Wi-Fi\u3092\u5225\u3005\u306b\u7ba1\u7406\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u30a8\u30f3\u30c9\u30c4\u30fc\u30a8\u30f3\u30c9\u306e\u901a\u4fe1\u54c1\u8cea\u3068\u3057\u3066\u6349\u3048\u308b\u8996\u70b9\u304c\u91cd\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><!-- notionvc: 1caa68bd-df2d-4018-869f-33422cf93bbb --><\/p>\n<h2>Layer 2\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306f\u300cLAN\u3060\u304b\u3089\u5b89\u5168\u300d\u3067\u306f\u306a\u3044<\/h2>\n<p>\u30c7\u30fc\u30bf\u30ea\u30f3\u30af\u5c64\u306b\u306f\u3001ARP\u30b9\u30d7\u30fc\u30d5\u30a3\u30f3\u30b0\u3001MAC\u30a2\u30c9\u30ec\u30b9\u507d\u88c5\u3001\u4e0d\u6b63\u306a\u30b9\u30a4\u30c3\u30c1\u63a5\u7d9a\u306a\u3069\u3001Layer 2\u7279\u6709\u306e\u30ea\u30b9\u30af\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u5b9f\u969b\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u306f\u3001\u30dd\u30fc\u30c8\u5358\u4f4d\u306e\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u3001MAC\u30a2\u30c9\u30ec\u30b9\u5236\u9650\u3001DHCP Snooping\u3001Dynamic ARP Inspection\u306a\u3069\u3092\u7d44\u307f\u5408\u308f\u305b\u3001\u7aef\u672b\u3084\u901a\u4fe1\u306e\u4fe1\u983c\u6027\u3092\u9ad8\u3081\u307e\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u91cd\u8981\u306a\u306e\u304cMACsec\u3067\u3059\u3002MACsec\u306fIEEE 802.1AE\u306b\u57fa\u3065\u304d\u3001Ethernet\u30d5\u30ec\u30fc\u30e0\u3092Layer 2\u3067\u4fdd\u8b77\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002\u30ea\u30f3\u30af\u4e0a\u306e\u76d7\u8074\u3084\u6539\u3056\u3093\u3078\u306e\u5bfe\u7b56\u3068\u3057\u3066\u5229\u7528\u3067\u304d\u3001\u7279\u306b\u30c7\u30fc\u30bf\u30bb\u30f3\u30bf\u30fc\u9593\u63a5\u7d9a\u3084\u4f01\u696d\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306a\u3069\u3001\u901a\u4fe1\u7d4c\u8def\u305d\u306e\u3082\u306e\u3092\u4fdd\u8b77\u3057\u305f\u3044\u5834\u9762\u3067\u610f\u5473\u3092\u6301\u3061\u307e\u3059\u3002IEEE 802.1\u3067\u306f2026\u5e74\u306b\u3082MACsec\u95a2\u9023\u306e\u6280\u8853\u691c\u8a0e\u304c\u7d9a\u3044\u3066\u304a\u308a\u3001Layer 2\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306f\u73fe\u5728\u9032\u884c\u5f62\u3067\u767a\u5c55\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001Layer 2\u3092\u5f37\u5316\u3059\u308c\u3070\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5168\u4f53\u304c\u5b89\u5168\u306b\u306a\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002NIST\u306e\u30bc\u30ed\u30c8\u30e9\u30b9\u30c8\u306e\u8003\u3048\u65b9\u3067\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306b\u5b58\u5728\u3059\u308b\u3053\u3068\u81ea\u4f53\u3092\u6697\u9ed9\u306e\u4fe1\u983c\u6839\u62e0\u306b\u305b\u305a\u3001\u30e6\u30fc\u30b6\u30fc\u3084\u30c7\u30d0\u30a4\u30b9\u3001\u30ea\u30bd\u30fc\u30b9\u5358\u4f4d\u3067\u8a8d\u8a3c\u30fb\u8a8d\u53ef\u3059\u308b\u3053\u3068\u304c\u91cd\u8996\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3064\u307e\u308a\u3001Layer 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Networking\uff09\u3067\u3059\u3002<\/p>\n<p>\u5f93\u6765\u306eEthernet\u306f\u300c\u3067\u304d\u308b\u3060\u3051\u901f\u304f\u5c4a\u3051\u308b\u300d\u3053\u3068\u304c\u4e2d\u5fc3\u3067\u3057\u305f\u3002TSN\u3067\u306f\u3001\u305d\u3053\u304b\u3089\u3055\u3089\u306b\u9032\u307f\u3001\u9045\u5ef6\u3084\u30b8\u30c3\u30bf\u30fc\u3092\u5236\u5fa1\u3057\u3001\u6642\u9593\u7684\u306a\u4e88\u6e2c\u53ef\u80fd\u6027\u3092\u9ad8\u3081\u307e\u3059\u3002<\/p>\n<p>\u4ee3\u8868\u7684\u306a\u4ed5\u7d44\u307f\u304cIEEE 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