{"id":540,"date":"2026-03-04T16:41:41","date_gmt":"2026-03-04T07:41:41","guid":{"rendered":"https:\/\/venu-sys.co.jp\/knowledge\/?post_type=glossary&#038;p=540"},"modified":"2026-03-04T16:41:41","modified_gmt":"2026-03-04T07:41:41","slug":"protocol","status":"publish","type":"glossary","link":"https:\/\/venu-sys.co.jp\/knowledge\/glossary\/protocol\/","title":{"rendered":"\u30d7\u30ed\u30c8\u30b3\u30eb"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">\u3010\u521d\u5fc3\u8005\u5411\u3051\u3011\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u306f\uff1f\u4ed5\u7d44\u307f\u3084\u4ee3\u8868\u7684\u306a\u7a2e\u985e\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac<\/h1>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"blue\"><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p>\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u3044\u3046\u8a00\u8449\u3092\u805e\u3044\u305f\u3051\u308c\u3069\u3001\u610f\u5473\u304c\u96e3\u3057\u304f\u3066\u3088\u304f\u5206\u304b\u3089\u306a\u3044<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"blue\"><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p>IT\u306e\u52c9\u5f37\u3092\u59cb\u3081\u305f\u3070\u304b\u308a\u3067\u3001\u5c02\u9580\u7528\u8a9e\u306e\u58c1\u306b\u3076\u3064\u304b\u3063\u3066\u3044\u308b<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"blue\"><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u4ed5\u7d44\u307f\u3092\u57fa\u790e\u304b\u3089\u52b9\u7387\u3088\u304f\u7406\u89e3\u3057\u305f\u3044<\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<p>IT\u306e\u5b66\u7fd2\u3092\u59cb\u3081\u308b\u3068\u5fc5\u305a\u76ee\u306b\u3059\u308b\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u3044\u3046\u8a00\u8449\u3067\u3059\u304c\u3001\u591a\u304f\u306e\u521d\u5fc3\u8005\u304c\u898f\u7d04\u3084\u7d04\u675f\u4e8b\u3068\u3044\u3063\u305f\u62bd\u8c61\u7684\u306a\u8aac\u660e\u3060\u3051\u3067\u3064\u307e\u305a\u3044\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color has-swl-deep-01-color\">\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u306f\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u30fc\u540c\u58eb\u304c\u4f1a\u8a71\u3059\u308b\u305f\u3081\u306e\u5171\u901a\u30eb\u30fc\u30eb\u306e\u3053\u3068<\/span><\/span><\/strong>\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u57fa\u672c\u77e5\u8b58\u3084\u4ee3\u8868\u7684\u306a\u7a2e\u985e\u3001\u5f79\u5272\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_announce\">\u8a18\u4e8b\u3092\u8aad\u3081\u3070\u3001\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u4ed5\u7d44\u307f\u3084\u7a2e\u985e\u304c\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u306f\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u30fc\u540c\u58eb\u304c\u4f1a\u8a71\u3059\u308b\u305f\u3081\u306e\u5171\u901a\u30eb\u30fc\u30eb\u306e\u3053\u3068<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163359.432-1024x572.jpg\" alt=\"\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u306f\u306e\u753b\u50cf\" class=\"wp-image-543\" style=\"width:640px\" srcset=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163359.432-1024x572.jpg 1024w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163359.432-300x167.jpg 300w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163359.432-768x429.jpg 768w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163359.432-1536x857.jpg 1536w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163359.432-2048x1143.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color has-swl-deep-01-color\">\u30d7\u30ed\u30c8\u30b3\u30eb\u306f\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u30fc\u3084\u6a5f\u5668\u304c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u901a\u4fe1\u3092\u884c\u3046\u969b\u306b\u5b88\u308b\u3079\u304d\u5171\u901a\u30eb\u30fc\u30eb\u306e\u3053\u3068<\/span><\/span><\/strong>\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4eba\u9593\u540c\u58eb\u304c\u4f1a\u8a71\u3092\u3059\u308b\u3068\u304d\u306b\u8a00\u8a9e\u3092\u5408\u308f\u305b\u308b\u5fc5\u8981\u304c\u3042\u308b\u3088\u3046\u306b\u3001\u6a5f\u5668\u540c\u58eb\u3082\u540c\u3058\u30eb\u30fc\u30eb\u3092\u4f7f\u308f\u306a\u3051\u308c\u3070\u60c5\u5831\u3092\u6b63\u3057\u304f\u3084\u308a\u53d6\u308a\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_pen\">\u4f8b\u3048\u3070\u3001\u65e5\u672c\u8a9e\u3057\u304b\u8a71\u305b\u306a\u3044\u4eba\u3068\u82f1\u8a9e\u3057\u304b\u8a71\u305b\u306a\u3044\u4eba\u3067\u306f\u4f1a\u8a71\u304c\u6210\u7acb\u3057\u307e\u305b\u3093\u3002\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u30fc\u306e\u4e16\u754c\u3067\u3082\u3001\u30c7\u30fc\u30bf\u306e\u5f62\u5f0f\u3084\u9001\u53d7\u4fe1\u306e\u624b\u9806\u304c\u30d0\u30e9\u30d0\u30e9\u3067\u306f\u901a\u4fe1\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4e16\u754c\u5171\u901a\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u304c\u5b9a\u3081\u3089\u308c\u3066\u3044\u308b\u304a\u304b\u3052\u3067\u3001\u30e1\u30fc\u30ab\u30fc\u3084\u6a5f\u7a2e\u304c\u7570\u306a\u308b\u6a5f\u5668\u540c\u58eb\u3067\u3082\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3092\u3064\u306a\u3052\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6458210138304151\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- \u6a2a\u9577 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:728px;height:150px\"\r\n     data-ad-client=\"ca-pub-6458210138304151\"\r\n     data-ad-slot=\"3619347934\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n\n\n\n<h2 class=\"wp-block-heading\">\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u4ed5\u7d44\u307f<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163433.179-1024x572.jpg\" alt=\"\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u4ed5\u7d44\u307f\u306e\u753b\u50cf\" class=\"wp-image-544\" style=\"width:640px\" srcset=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163433.179-1024x572.jpg 1024w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163433.179-300x167.jpg 300w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163433.179-768x429.jpg 768w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163433.179-1536x857.jpg 1536w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163433.179-2048x1143.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u30d7\u30ed\u30c8\u30b3\u30eb\u306f\u3001\u5358\u72ec\u3067\u52d5\u304f\u306e\u3067\u306f\u306a\u304f\u8907\u6570\u306e\u30eb\u30fc\u30eb\u304c\u7a4d\u307f\u91cd\u306a\u3063\u3066\u6a5f\u80fd\u3057\u307e\u3059\u3002\u3053\u306e\u4ed5\u7d44\u307f\u3092\u968e\u5c64\u30e2\u30c7\u30eb\u3068\u547c\u3073\u3001\u5404\u968e\u5c64\u304c\u7279\u5b9a\u306e\u5f79\u5272\u3092\u53d7\u3051\u6301\u3064\u3053\u3068\u3067\u3001\u8907\u96d1\u306a\u901a\u4fe1\u3092\u30b9\u30e0\u30fc\u30ba\u306b\u5b9f\u884c\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u901a\u4fe1\u306e\u5168\u5de5\u7a0b\u3092\u4e00\u4eba\u306e\u62c5\u5f53\u8005\u304c\u884c\u3046\u3068\u3001\u30c8\u30e9\u30d6\u30eb\u304c\u8d77\u304d\u305f\u969b\u306b\u539f\u56e0\u306e\u7279\u5b9a\u304c\u56f0\u96e3\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u304b\u3057\u3001<strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color has-swl-deep-01-color\">\u5f79\u5272\u3092\u7d30\u5206\u5316\u3057\u3066\u300c\u4f4f\u6240\u3092\u78ba\u8a8d\u3059\u308b\u4fc2\u300d\u300c\u8377\u7269\u3092\u904b\u3076\u4fc2\u300d\u300c\u4e2d\u8eab\u3092\u78ba\u8a8d\u3059\u308b\u4fc2\u300d\u306e\u3088\u3046\u306b\u5206\u62c5\u3059\u308c\u3070\u3001\u52b9\u7387\u7684\u306a\u901a\u4fe1\u304c\u53ef\u80fd<\/span><\/span><\/strong>\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u73fe\u5728\u306e\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3067\u306f\u300c<a href=\"https:\/\/venu-sys.co.jp\/knowledge\/glossary\/tcpip\/\" target=\"_blank\" rel=\"noreferrer noopener\">TCP\/IP<\/a>\u300d\u3068\u3044\u30464\u5c64\u69cb\u9020\u306e\u30e2\u30c7\u30eb\u304c\u4e3b\u6d41\u3067\u3059\u3002\u5404\u968e\u5c64\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u304c\u30d0\u30b1\u30c4\u30ea\u30ec\u30fc\u306e\u3088\u3046\u306b\u30c7\u30fc\u30bf\u3092\u6e21\u3057\u3066\u3044\u304f\u3053\u3068\u3067\u3001\u4e16\u754c\u4e2d\u306e\u7aef\u672b\u3078\u6b63\u78ba\u306b\u60c5\u5831\u304c\u5c4a\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6458210138304151\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- \u6a2a\u9577 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:728px;height:150px\"\r\n     data-ad-client=\"ca-pub-6458210138304151\"\r\n     data-ad-slot=\"3619347934\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ee3\u8868\u7684\u306a\u30d7\u30ed\u30c8\u30b3\u30eb<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img decoding=\"async\" width=\"1024\" height=\"572\" src=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163542.924-1024x572.jpg\" alt=\"\u4ee3\u8868\u7684\u306a\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u753b\u50cf\" class=\"wp-image-545\" style=\"width:640px\" srcset=\"https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163542.924-1024x572.jpg 1024w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163542.924-300x167.jpg 300w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163542.924-768x429.jpg 768w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163542.924-1536x857.jpg 1536w, https:\/\/venu-sys.co.jp\/knowledge\/wp-content\/uploads\/sites\/6\/2026\/03\/unnamed-2026-03-04T163542.924-2048x1143.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u306f\u8907\u6570\u306e\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u4ee3\u8868\u7684\u306a\u3082\u306e\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"swell-block-capbox cap_box is-style-onborder_ttl2\"><div class=\"cap_box_ttl\" data-has-icon=\"1\"><svg height=\"1em\" width=\"1em\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\" viewBox=\"0 0 48 48\"><path d=\"M32 46.5H16c-1.1 0-2-.9-2-2s.9-2 2-2h16c1.1 0 2 .9 2 2s-.9 2-2 2zM33.3 18.6c-.7 0-1.3-.5-1.5-1.2-.7-3.2-3.2-5.7-6.4-6.3-.8-.1-1.4-.9-1.2-1.7s.9-1.4 1.7-1.2c4.4.8 8 4.2 8.9 8.6.2.8-.4 1.6-1.2 1.8h-.3z\"><\/path><path d=\"M30 40.5H18c-2.2 0-4-1.8-4-4v-1.6c0-.6-.3-1.1-.8-1.5C8.4 29.8 5.7 24 6 18c.5-9.1 8-16.6 17.1-17C29 .8 34.5 3.2 38.2 8c1.8 2.3 3 5.1 3.5 7.9 1.1 6.8-1.5 13.3-6.9 17.4-.6.4-.9 1-.9 1.7v1.5c.1 2.2-1.7 4-3.9 4zM23.3 5c-7.1.3-12.9 6.2-13.3 13.2-.2 4.7 1.8 9.1 5.6 11.9 1.5 1.1 2.4 2.9 2.4 4.7v.6c0 .6.4 1 1 1h10c.6 0 1-.4 1-1V35c0-1.9.9-3.7 2.5-4.8 4.3-3.2 6.3-8.5 5.3-13.9-.4-2-1.2-3.8-2.4-5.4-3-4-7.4-6.1-12.1-5.9z\"><\/path><\/svg><span>\u4ee3\u8868\u7684\u306a\u30d7\u30ed\u30c8\u30b3\u30eb<\/span><\/div><div class=\"cap_box_content\">\n<ul class=\"wp-block-list is-style-check_list\">\n<li><a href=\"#toc1\">IP\uff08Internet Protocol\uff09<\/a><\/li>\n\n\n\n<li><a href=\"#toc2\">SMTP\uff08Simple Mail Transfer Protocol\uff09<\/a><\/li>\n\n\n\n<li><a href=\"#toc3\">DNS\uff08Domain Name System\uff09<\/a><\/li>\n\n\n\n<li><a href=\"#toc4\">FTP\uff08File Transfer Protocol\uff09<\/a><\/li>\n\n\n\n<li><a href=\"#toc5\">UDP\uff08User Datagram Protocol\uff09<\/a><\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<figure class=\"wp-block-table\"><table style=\"font-size:12px;\" class=\"has-fixed-layout\"><thead><tr><td><strong>\u30d7\u30ed\u30c8\u30b3\u30eb\u540d<\/strong><\/td><td><strong>\u5f79\u5272\u306e\u8981\u7d04<\/strong><\/td><td><strong>\u5177\u4f53\u7684\u306a\u5229\u7528\u30b7\u30fc\u30f3<\/strong><\/td><\/tr><\/thead><tbody><tr><td><strong>IP<\/strong><\/td><td>\u30c7\u30fc\u30bf\u306e\u4f4f\u6240\u3092\u7279\u5b9a\u3059\u308b<\/td><td>\u76f8\u624b\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3078\u8377\u7269\u3092\u5c4a\u3051\u308b<\/td><\/tr><tr><td><strong>SMTP<\/strong><\/td><td>\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3059\u308b<\/td><td>\u81ea\u5206\u306e\u30e1\u30fc\u30eb\u3092\u76f8\u624b\u306e\u30b5\u30fc\u30d0\u30fc\u3078\u9001\u308b<\/td><\/tr><tr><td><strong>DNS<\/strong><\/td><td>\u540d\u524d\u3068\u4f4f\u6240\u3092\u7d10\u4ed8\u3051\u308b<\/td><td>URL\u3092IP\u30a2\u30c9\u30ec\u30b9\u306b\u5909\u63db\u3059\u308b<\/td><\/tr><tr><td><strong>FTP<\/strong><\/td><td>\u30d5\u30a1\u30a4\u30eb\u3092\u8ee2\u9001\u3059\u308b<\/td><td>\u30b5\u30fc\u30d0\u30fc\u3078Web\u30b5\u30a4\u30c8\u306e\u7d20\u6750\u3092\u30a2\u30c3\u30d7\u3059\u308b<\/td><\/tr><tr><td><strong>UDP<\/strong><\/td><td>\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u901a\u4fe1\u3092\u884c\u3046<\/td><td>\u52d5\u753b\u914d\u4fe1\u3084\u30aa\u30f3\u30e9\u30a4\u30f3\u30b2\u30fc\u30e0\u306e\u901a\u4fe1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"toc1\">IP\uff08Internet Protocol\uff09 | \u30c7\u30fc\u30bf\u306e\u9001\u308a\u5148\uff08\u4f4f\u6240\uff09\u3092\u7279\u5b9a\u3059\u308b\u5f79\u5272<\/h3>\n\n\n\n<p>IP\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306b\u304a\u3051\u308b\u30c7\u30fc\u30bf\u306e\u914d\u9001\u5148\u3092\u6c7a\u5b9a\u3059\u308b\u91cd\u8981\u306a\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3059\u3002<strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color has-swl-deep-01-color\">\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u5404\u6a5f\u5668\u306b\u300cIP\u30a2\u30c9\u30ec\u30b9\u300d\u3068\u3044\u3046\u4f4f\u6240\u3092\u5272\u308a\u5f53\u3066\u3001\u30c7\u30fc\u30bf\u304c\u3069\u3053\u3078\u884c\u304f\u3079\u304d\u304b\u3092\u5236\u5fa1<\/span><\/span><\/strong>\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>IP\u304c\u306a\u3044\u3068\u3001\u30c7\u30fc\u30bf\u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u4e2d\u3067\u8ff7\u5b50\u306b\u306a\u308a\u3001\u76ee\u7684\u5730\u306b\u305f\u3069\u308a\u7740\u3051\u307e\u305b\u3093\u3002IP\u306f\u3042\u304f\u307e\u3067\u300c\u4f4f\u6240\u306e\u7279\u5b9a\u300d\u3068\u300c\u914d\u9001\u300d\u306b\u7279\u5316\u3057\u3066\u304a\u308a\u3001\u30c7\u30fc\u30bf\u304c\u58ca\u308c\u305a\u306b\u5c4a\u3044\u305f\u304b\u3069\u3046\u304b\u306e\u78ba\u8a8d\u306f\u5225\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u4efb\u305b\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"toc2\">SMTP\uff08Simple Mail Transfer Protocol\uff09 | \u30e1\u30fc\u30eb\u3092\u76f8\u624b\u306e\u30b5\u30fc\u30d0\u30fc\u3078\u9001\u4fe1\u3059\u308b\u5f79\u5272<\/h3>\n\n\n\n<p><strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color has-swl-deep-01-color\">SMTP\u306f\u3001\u96fb\u5b50\u30e1\u30fc\u30eb\u3092\u9001\u4fe1\u3057\u305f\u308a\u3001\u30b5\u30fc\u30d0\u30fc\u9593\u3067\u8ee2\u9001\u3057\u305f\u308a\u3059\u308b\u305f\u3081\u306e\u30eb\u30fc\u30eb<\/span><\/span><\/strong>\u3067\u3059\u3002\u79c1\u305f\u3061\u304c\u30e1\u30fc\u30eb\u30bd\u30d5\u30c8\u3067\u300c\u9001\u4fe1\u300d\u30dc\u30bf\u30f3\u3092\u62bc\u3057\u305f\u3068\u304d\u3001SMTP\u304c\u4f5c\u52d5\u3057\u3066\u30e1\u30fc\u30eb\u3092\u76ee\u7684\u5730\u307e\u3067\u904b\u3073\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30e1\u30fc\u30eb\u306e\u914d\u9001\u306f\u3001\u9001\u4fe1\u8005\u306e\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u53d7\u4fe1\u8005\u306e\u30b5\u30fc\u30d0\u30fc\u3078\u3068\u30d0\u30b1\u30c4\u30ea\u30ec\u30fc\u5f62\u5f0f\u3067\u884c\u308f\u308c\u307e\u3059\u3002SMTP\u306f\u3001\u76f8\u624b\u306e\u30b5\u30fc\u30d0\u30fc\u306b\u5bfe\u3057\u3066\u300c\u3053\u308c\u304b\u3089\u30e1\u30fc\u30eb\u3092\u9001\u308a\u307e\u3059\u300d\u3068\u6328\u62f6\u3057\u3001\u627f\u8a8d\u3092\u5f97\u3066\u304b\u3089\u672c\u6587\u3092\u6e21\u3059\u624b\u9806\u3092\u898f\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30e1\u30fc\u30eb\u9001\u4fe1\u5c02\u7528\u306e\u30eb\u30fc\u30eb\u304c\u3042\u308b\u304a\u304b\u3052\u3067\u3001\u4e16\u754c\u4e2d\u306b\u30e1\u30fc\u30eb\u3092\u5c4a\u3051\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"toc3\">DNS\uff08Domain Name System\uff09 | \u30c9\u30e1\u30a4\u30f3\u540d\u3068IP\u30a2\u30c9\u30ec\u30b9\u3092\u7d10\u4ed8\u3051\u308b\u300c\u96fb\u8a71\u5e33\u300d\u306e\u5f79\u5272<\/h3>\n\n\n\n<p><strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color has-swl-deep-01-color\">DNS\u306f\u3001\u4eba\u9593\u304c\u7406\u89e3\u3057\u3084\u3059\u3044\u30c9\u30e1\u30a4\u30f3\u540d\uff08https:\/\/www.google.com\/search?q=google.com\u306a\u3069\uff09\u3092\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u30fc\u304c\u7406\u89e3\u3067\u304d\u308bIP\u30a2\u30c9\u30ec\u30b9\u306b\u5909\u63db\u3059\u308b\u30d7\u30ed\u30c8\u30b3\u30eb<\/span><\/span><\/strong>\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u4e0a\u306e\u81a8\u5927\u306a\u4f4f\u6240\u9332\u3092\u7ba1\u7406\u3059\u308b\u96fb\u8a71\u5e33\u306e\u3088\u3046\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30d6\u30e9\u30a6\u30b6\u306bURL\u3092\u5165\u529b\u3057\u305f\u969b\u3001DNS\u304c\u5373\u5ea7\u306b\u6570\u5b57\u306e\u7f85\u5217\u3067\u3042\u308bIP\u30a2\u30c9\u30ec\u30b9\u3092\u5f15\u304d\u51fa\u3057\u307e\u3059\u3002\u3082\u3057DNS\u304c\u5b58\u5728\u3057\u306a\u3051\u308c\u3070\u3001\u79c1\u305f\u3061\u306fWeb\u30b5\u30a4\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3073\u306b\u8907\u96d1\u306a\u6570\u5b57\u3092\u6697\u8a18\u3057\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"toc4\">FTP\uff08File Transfer Protocol\uff09 | \u30b5\u30fc\u30d0\u30fc\u9593\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u8ee2\u9001\u3059\u308b\u305f\u3081\u306e\u5f79\u5272<\/h3>\n\n\n\n<p><strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color has-swl-deep-01-color\">FTP\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u30b5\u30fc\u30d0\u30fc\u3068\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u9593\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u9001\u53d7\u4fe1\u3059\u308b\u305f\u3081\u306e\u30d7\u30ed\u30c8\u30b3\u30eb<\/span><\/span><\/strong>\u3067\u3059\u3002Web\u30b5\u30a4\u30c8\u306e\u5236\u4f5c\u30c7\u30fc\u30bf\u3092\u30b5\u30fc\u30d0\u30fc\u306b\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3057\u305f\u308a\u3001\u5927\u5bb9\u91cf\u306e\u8cc7\u6599\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u305f\u308a\u3059\u308b\u969b\u306b\u5229\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u7279\u5b9a\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u78ba\u5b9f\u306b\u8ee2\u9001\u3059\u308b\u3053\u3068\u306b\u7279\u5316\u3057\u3066\u304a\u308a\u3001\u8ee2\u9001\u4e2d\u306b\u30a8\u30e9\u30fc\u304c\u8d77\u304d\u306a\u3044\u3088\u3046\u53b3\u5bc6\u306a\u5236\u5fa1\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u73fe\u5728\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3092\u9ad8\u3081\u305fSFTP\u306a\u3069\u304c\u4e3b\u6d41\u3067\u3059\u304c\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u3084\u308a\u53d6\u308a\u306b\u304a\u3051\u308b\u57fa\u672c\u30eb\u30fc\u30eb\u3068\u3057\u3066\u9577\u5e74\u91cd\u5b9d\u3055\u308c\u3066\u3044\u308b\u898f\u683c\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"toc5\">UDP\uff08User Datagram Protocol\uff09 | \u901f\u3055\u3092\u512a\u5148\u3057\u3066\u30c7\u30fc\u30bf\u3092\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u306b\u9001\u308b\u5f79\u5272<\/h3>\n\n\n\n<p><strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color has-swl-deep-01-color\">UDP\u306f\u3001\u901a\u4fe1\u306e\u78ba\u5b9f\u6027\u3088\u308a\u3082\u300c\u901f\u5ea6\u300d\u3084\u300c\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u6027\u300d\u3092\u6700\u512a\u5148\u3059\u308b\u30d7\u30ed\u30c8\u30b3\u30eb<\/span><\/span><\/strong>\u3067\u3059\u3002\u30c7\u30fc\u30bf\u306e\u5230\u7740\u78ba\u8a8d\u3084\u518d\u9001\u51e6\u7406\u3092\u7701\u304f\u3053\u3068\u3067\u3001\u9045\u5ef6\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u305f\u901a\u4fe1\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u52d5\u753b\u306e\u30e9\u30a4\u30d6\u914d\u4fe1\u3084\u30aa\u30f3\u30e9\u30a4\u30f3\u901a\u8a71\u3067\u306f\u3001\u4e00\u77ac\u306e\u9045\u308c\u304c\u81f4\u547d\u7684\u306b\u306a\u308a\u307e\u3059\u3002\u591a\u5c11\u306e\u30c7\u30fc\u30bf\u6b20\u640d\u304c\u3042\u3063\u3066\u3082\u3001\u6620\u50cf\u3084\u97f3\u58f0\u304c\u6b62\u307e\u3089\u305a\u306b\u6d41\u308c\u7d9a\u3051\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<p>UDP\u306f\u3001\u60c5\u5831\u306e\u6b63\u78ba\u3055\u3088\u308a\u3082\u30b9\u30d4\u30fc\u30c9\u304c\u6c42\u3081\u3089\u308c\u308b\u30b7\u30fc\u30f3\u3067\u771f\u4fa1\u3092\u767a\u63ee\u3059\u308b\u3001\u7279\u6025\u4fbf\u306e\u3088\u3046\u306a\u30eb\u30fc\u30eb\u3067\u3059\u3002<\/p>\n\n\n\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6458210138304151\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- \u6a2a\u9577 -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:inline-block;width:728px;height:150px\"\r\n     data-ad-client=\"ca-pub-6458210138304151\"\r\n     data-ad-slot=\"3619347934\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n\n\n\n<h2 class=\"wp-block-heading\">\u306a\u305c\u30d7\u30ed\u30c8\u30b3\u30eb\u304c\u5fc5\u8981\uff1f\u5171\u901a\u30eb\u30fc\u30eb\u304c\u306a\u3044\u3068\u901a\u4fe1\u306f\u6210\u7acb\u3057\u306a\u3044<\/h2>\n\n\n\n<p>\u30d7\u30ed\u30c8\u30b3\u30eb\u304c\u5fc5\u8981\u306a\u7406\u7531\u306f\u3001<strong><span class=\"swl-marker mark_yellow\"><span class=\"swl-inline-color 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