{"id":363,"date":"2025-06-14T17:39:00","date_gmt":"2025-06-14T08:39:00","guid":{"rendered":"https:\/\/ccna-curriculum.tech-village.co.jp\/?p=363"},"modified":"2025-10-22T13:49:05","modified_gmt":"2025-10-22T04:49:05","slug":"l2%e3%82%bb%e3%82%ad%e3%83%a5%e3%83%aa%e3%83%86%e3%82%a3%ef%bc%88%e3%82%b9%e3%83%97%e3%83%bc%e3%83%95%e3%82%a3%e3%83%b3%e3%82%b0%e5%af%be%e7%ad%96-dhcp%e7%b3%bb%ef%bc%89","status":"publish","type":"post","link":"https:\/\/ccna-curriculum.tech-village.co.jp\/?p=363","title":{"rendered":"L2\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\uff08\u30b9\u30d7\u30fc\u30d5\u30a3\u30f3\u30b0\u5bfe\u7b56\/DHCP\u7cfb\uff09"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">DHCP\u30b9\u30d7\u30fc\u30d5\u30a3\u30f3\u30b0\u3068\u306f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><span class=\"swl-marker mark_yellow\">DHCP\u30b9\u30d7\u30fc\u30d5\u30a3\u30f3\u30b0<\/span><\/strong>\u3068\u306f\u3001\u4e0d\u6b63\u306a\u7aef\u672b\u304cDHCP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3084DHCP\u30b5\u30fc\u30d0\u306b\u306a\u308a\u3059\u307e\u3057\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306b\u88ab\u5bb3\u3092\u4e0e\u3048\u308b\u653b\u6483\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u653b\u6483\u8005\u304c<strong>\u4e0d\u6b63\u306aDHCP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8<\/strong>\u306b\u306a\u308a\u3059\u307e\u3059\u5834\u5408\u3001\u6b63\u898f\u306eDHCP\u30b5\u30fc\u30d0\u306b\u5bfe\u3057\u3066\u5927\u91cf\u306eDHCP\u8981\u6c42\uff08DISCOVER\u3084REQUEST\uff09\u3092\u9001\u308a\u3064\u3051\u3001\u30a2\u30c9\u30ec\u30b9\u30d7\u30fc\u30eb\u3092\u67af\u6e07\u3055\u305b\u3066\u6b63\u5e38\u306a\u30e6\u30fc\u30b6\u304cIP\u30a2\u30c9\u30ec\u30b9\u3092\u53d6\u5f97\u3067\u304d\u306a\u304f\u306a\u308b\u6050\u308c\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u65b9\u3067\u653b\u6483\u8005\u304c<strong>\u4e0d\u6b63\u306aDHCP\u30b5\u30fc\u30d0<\/strong>\u306b\u306a\u308a\u3059\u307e\u3059\u5834\u5408\u3001\u6b63\u898f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u9001\u4fe1\u3059\u308bDHCP\u8981\u6c42\u306b\u5bfe\u3057\u3066\u507d\u306e\u5fdc\u7b54\u3092\u8fd4\u3057\u3001\u8aa4\u3063\u305f\u30c7\u30d5\u30a9\u30eb\u30c8\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3084DNS\u30b5\u30fc\u30d0\u3092\u901a\u77e5\u3057\u307e\u3059\u3002\u305d\u306e\u7d50\u679c\u3001\u30e6\u30fc\u30b6\u306e\u901a\u4fe1\u306f\u653b\u6483\u8005\u306e\u7ba1\u7406\u4e0b\u306b\u6d41\u3055\u308c\u3001\u76d7\u8074\u3084\u6539\u3056\u3093\u306e\u5371\u967a\u304c\u751f\u3058\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u7279\u306bDHCP\u30ea\u30af\u30a8\u30b9\u30c8\u306f<strong>\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u3067\u9001\u4fe1\u3055\u308c\u308b<\/strong>\u305f\u3081\u3001\u540c\u3058VLAN\u5185\u3067\u3042\u308c\u3070\u653b\u6483\u8005\u306f\u5bb9\u6613\u306b\u5fdc\u7b54\u3067\u304d\u3066\u3057\u307e\u3046\u70b9\u304c\u8106\u5f31\u6027\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Catalyst\u30b9\u30a4\u30c3\u30c1\u3067\u306e\u30b9\u30d7\u30fc\u30d5\u30a3\u30f3\u30b0\u5bfe\u7b56<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Catalyst\u30b9\u30a4\u30c3\u30c1\u3067\u306f\u3001DHCP\u30b9\u30d7\u30fc\u30d5\u30a3\u30f3\u30b0\u3092\u542b\u3080\u306a\u308a\u3059\u307e\u3057\u653b\u6483\u306b\u5bfe\u3057\u3066\u4ee5\u4e0b\u306e\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306f\u9023\u643a\u3057\u3066\u52d5\u4f5c\u3059\u308b\u305f\u3081\u3001\u57fa\u672c\u7684\u306b<strong>DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u3092\u6709\u52b9\u306b\u3059\u308b\u3053\u3068\u304c\u524d\u63d0<\/strong>\u3068\u306a\u308a\u307e\u3059\u3002DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u304c\u751f\u6210\u3059\u308b\u300c\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u30c6\u30fc\u30d6\u30eb\u300d\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5404\u7a2e\u691c\u8a3c\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u6a5f\u80fd<\/th><th>\u9632\u5fa1\u5bfe\u8c61<\/th><th>\u8aac\u660e<\/th><\/tr><\/thead><tbody><tr><td>DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0<\/td><td>\u4e0d\u6b63\u306aDHCP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3084DHCP\u30b5\u30fc\u30d0<\/td><td>DHCP\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u76e3\u8996\u3057\u3001DHCP\u30b5\u30fc\u30d0\u306b\u306a\u308a\u3059\u307e\u3057\u305f\u4e0d\u6b63\u306a\u5fdc\u7b54\u3084\u3001\u5927\u91cf\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u5236\u5fa1<\/td><\/tr><tr><td>IP\u30bd\u30fc\u30b9\u30ac\u30fc\u30c9<\/td><td>\u4e0d\u6b63\u306a\u9001\u4fe1\u5143IP\u30a2\u30c9\u30ec\u30b9<\/td><td>DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u306e\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u60c5\u5831\u3092\u57fa\u306b\u3001\u30dd\u30fc\u30c8\u304b\u3089\u9001\u51fa\u3055\u308c\u308bIP\u30d1\u30b1\u30c3\u30c8\u306e\u9001\u4fe1\u5143IP\u3092\u691c\u8a3c<\/td><\/tr><tr><td>Dynamic ARP Inspection\uff08DAI\uff09<\/td><td>\u4e0d\u6b63\u306aARP\u30ea\u30d7\u30e9\u30a4<\/td><td>DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u306e\u60c5\u5831\u3092\u53c2\u7167\u3057\u3001ARP\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u6b63\u5f53\u6027\u3092\u691c\u8a3c\u3057\u3066ARP\u30b9\u30d7\u30fc\u30d5\u30a3\u30f3\u30b0\u3092\u9632\u6b62<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u3092\u6b63\u3057\u304f\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001DHCP\u30b9\u30d7\u30fc\u30d5\u30a3\u30f3\u30b0\u3060\u3051\u3067\u306a\u304f\u3001\u95a2\u9023\u3059\u308b<strong>IP\u30a2\u30c9\u30ec\u30b9\u306a\u308a\u3059\u307e\u3057\u653b\u6483<\/strong>\u3084<strong>ARP\u30b9\u30d7\u30fc\u30d5\u30a3\u30f3\u30b0<\/strong>\u3082\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u7279\u306b\u8a66\u9a13\u3067\u306f\u3001\u300cDHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u3092\u6709\u52b9\u306b\u3057\u306a\u3044\u3068IP\u30bd\u30fc\u30b9\u30ac\u30fc\u30c9\u3084DAI\u306f\u52d5\u4f5c\u3057\u306a\u3044\u300d\u300cDHCP\u30ea\u30af\u30a8\u30b9\u30c8\u304c\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u3067\u9001\u4fe1\u3055\u308c\u308b\u305f\u3081\u653b\u6483\u304c\u5bb9\u6613\u300d\u3068\u3044\u3063\u305f\u70b9\u304c\u554f\u308f\u308c\u3084\u3059\u3044\u305f\u3081\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u3068\u306f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><span class=\"swl-marker mark_yellow\">DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0<\/span><\/strong>\u306f\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6a5f\u5668\uff08\u30b9\u30a4\u30c3\u30c1\uff09\u304cDHCP\u306e\u3084\u308a\u53d6\u308a\u3092\u76e3\u8996\u3057\u3066\u3001\u4e0d\u6b63\u306aDHCP\u30b5\u30fc\u30d0\u306b\u3088\u308b\u653b\u6483\u3092\u9632\u3050\u305f\u3081\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u6a5f\u80fd\u3067\u3059\u3002\u7279\u306b\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u672c\u6765\u53d7\u3051\u53d6\u308b\u3079\u304d\u6b63\u3057\u3044IP\u30a2\u30c9\u30ec\u30b9\u3092\u3001\u306a\u308a\u3059\u307e\u3057\u30b5\u30fc\u30d0\u306b\u596a\u308f\u308c\u308b\u300cDHCP\u30b9\u30d7\u30fc\u30d5\u30a3\u30f3\u30b0\u653b\u6483\u300d\u3092\u9632\u3050\u76ee\u7684\u3067\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b9\u30a4\u30c3\u30c1\u3067DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u3092\u6709\u52b9\u5316\u3059\u308b\u3068\u3001\u30dd\u30fc\u30c8\u3054\u3068\u306b\u300c\u4fe1\u983c\u3067\u304d\u308b\u300d\u304b\u300c\u4fe1\u983c\u3067\u304d\u306a\u3044\u300d\u304b\u3092\u533a\u5225\u3059\u308b\u8a2d\u5b9a\u3092\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4fe1\u983c\u3067\u304d\u308b\u30dd\u30fc\u30c8\uff08Trusted\uff09<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u672c\u7269\u306eDHCP\u30b5\u30fc\u30d0\u304c\u63a5\u7d9a\u3055\u308c\u308b\u30dd\u30fc\u30c8\u3092\u6307\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u3053\u306e\u30dd\u30fc\u30c8\u304b\u3089\u9001\u3089\u308c\u3066\u304f\u308bDHCP\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u3059\u3079\u3066\u8a31\u53ef\u3055\u308c\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u4fe1\u983c\u3067\u304d\u306a\u3044\u30dd\u30fc\u30c8\uff08Untrusted\uff09<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u901a\u5e38\u306ePC\u3084\u30b9\u30de\u30db\u306a\u3069\u3001DHCP\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u63a5\u7d9a\u3055\u308c\u308b\u30dd\u30fc\u30c8\u3092\u6307\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u3053\u306e\u30dd\u30fc\u30c8\u304b\u3089\u9001\u3089\u308c\u308b\u306e\u306f\u300cDHCP\u8981\u6c42\uff08IP\u30a2\u30c9\u30ec\u30b9\u304c\u6b32\u3057\u3044\u3068\u3044\u3046\u30ea\u30af\u30a8\u30b9\u30c8\uff09\u300d\u306e\u307f\u8a31\u53ef\u3055\u308c\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u4e07\u4e00\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u507d\u88c5\u3057\u305f\u7aef\u672b\u304c\u4e0d\u6b63\u306aDHCP\u5fdc\u7b54\u3092\u9001\u4fe1\u3057\u3066\u3082\u3001\u30b9\u30a4\u30c3\u30c1\u304c\u7834\u68c4\u3059\u308b\u305f\u3081\u88ab\u5bb3\u306f\u9632\u3052\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u3053\u3067\u306e\u30dd\u30a4\u30f3\u30c8\u306f\u3001\u300cDHCP\u30b5\u30fc\u30d0\u306b\u901a\u3058\u308b\u30dd\u30fc\u30c8\u3060\u3051\u3092Trusted\u306b\u3057\u3066\u304a\u304f\u300d\u3053\u3068\u3067\u3059\u3002\u305d\u3046\u3059\u308c\u3070\u4ed6\u306e\u30dd\u30fc\u30c8\u3067\u3069\u3093\u306a\u6a5f\u5668\u304c\u63a5\u7d9a\u3055\u308c\u3066\u3082\u3001\u6b63\u898f\u306e\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f\u6b63\u3057\u304fIP\u30a2\u30c9\u30ec\u30b9\u3092\u53d6\u5f97\u3067\u304d\u3001\u4e0d\u6b63\u306a\u5fdc\u7b54\u306f\u30d6\u30ed\u30c3\u30af\u3055\u308c\u307e\u3059\u3002\u8a66\u9a13\u3067\u306f\u3053\u306e\u4ed5\u7d44\u307f\u3092\u62bc\u3055\u3048\u3066\u304a\u304f\u3053\u3068\u304c\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u30c6\u30fc\u30d6\u30eb\u306e\u4ed5\u7d44\u307f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u304c\u6709\u52b9\u306a\u30b9\u30a4\u30c3\u30c1\u306f\u3001DHCP\u306e\u3084\u308a\u53d6\u308a\u3092\u8a18\u9332\u3057\u3066<strong><span class=\"swl-marker mark_yellow\">\u300c\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u30c6\u30fc\u30d6\u30eb\u300d<\/span><\/strong>\u3068\u547c\u3070\u308c\u308b\u4e00\u89a7\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u3053\u3053\u306b\u306f\u4ee5\u4e0b\u306e\u60c5\u5831\u304c\u8a18\u9332\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306eMAC\u30a2\u30c9\u30ec\u30b9<\/li>\n\n\n\n<li>\u5272\u308a\u5f53\u3066\u3089\u308c\u305fIP\u30a2\u30c9\u30ec\u30b9<\/li>\n\n\n\n<li>\u30ea\u30fc\u30b9\u306e\u7a2e\u985e\uff08\u52d5\u7684\u304b\u9759\u7684\u304b\uff09<\/li>\n\n\n\n<li>VLAN\u756a\u53f7<\/li>\n\n\n\n<li>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u63a5\u7d9a\u3057\u3066\u3044\u308b\u30b9\u30a4\u30c3\u30c1\u306e\u30dd\u30fc\u30c8\u756a\u53f7<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u60c5\u5831\u3092\u57fa\u306b\u3057\u3066\u3001\u30b9\u30a4\u30c3\u30c1\u306f\u300c\u305d\u306e\u30dd\u30fc\u30c8\u306b\u63a5\u7d9a\u3055\u308c\u3066\u3044\u308b\u7aef\u672b\u304c\u6b63\u3057\u3044IP\u30a2\u30c9\u30ec\u30b9\u3092\u4f7f\u3063\u3066\u3044\u308b\u304b\u300d\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u3082\u3057\u4e0d\u4e00\u81f4\u304c\u3042\u308c\u3070\u3001\u305d\u306e\u901a\u4fe1\u306f\u7834\u68c4\u3055\u308c\u307e\u3059\u3002\u3064\u307e\u308a\u3001DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u306f\u300c\u6b63\u3057\u3044\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3068IP\u30a2\u30c9\u30ec\u30b9\u306e\u5bfe\u5fdc\u95a2\u4fc2\u300d\u3092\u4fdd\u8a3c\u3059\u308b\u5f79\u5272\u3082\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">DHCP Option 82<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u3055\u3089\u306b\u767a\u5c55\u7684\u306a\u4ed5\u7d44\u307f\u3068\u3057\u3066<strong><span class=\"swl-marker mark_yellow\">\u300cDHCP Option 82\u300d<\/span><\/strong>\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u30b9\u30a4\u30c3\u30c1\u304cDHCP\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4e2d\u7d99\u3059\u308b\u969b\u306b\u3001\u8ffd\u52a0\u60c5\u5831\u3092\u4ed8\u3051\u52a0\u3048\u308b\u6a5f\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5177\u4f53\u7684\u306b\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089\u9001\u3089\u308c\u305f\u300cDHCP Discover\u300d\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u3001\u6b21\u306e\u3088\u3046\u306a\u60c5\u5831\u3092\u4ed8\u4e0e\u3057\u3066\u30b5\u30fc\u30d0\u3078\u8ee2\u9001\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b9\u30a4\u30c3\u30c1\u81ea\u8eab\u306eMAC\u30a2\u30c9\u30ec\u30b9<\/li>\n\n\n\n<li>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u63a5\u7d9a\u3055\u308c\u3066\u3044\u308b\u30dd\u30fc\u30c8\u756a\u53f7<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u306b\u3088\u3063\u3066\u3001\u540c\u3058\u30b9\u30a4\u30c3\u30c1\u306b\u8907\u6570\u306e\u7aef\u672b\u304c\u63a5\u7d9a\u3055\u308c\u3066\u3044\u305f\u3068\u3057\u3066\u3082\u3001DHCP\u30b5\u30fc\u30d0\u5074\u3067\u300c\u3069\u306e\u30dd\u30fc\u30c8\u304b\u3089\u306e\u8981\u6c42\u304b\u300d\u3092\u8b58\u5225\u3067\u304d\u3001\u3088\u308a\u53b3\u5bc6\u306a\u7ba1\u7406\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u3067\u306f\u3001\u300cDHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u306f\u4e0d\u6b63\u306aDHCP\u30b5\u30fc\u30d0\u3092\u6392\u9664\u3059\u308b\u300d\u300cOption 82\u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u8b58\u5225\u3092\u5f37\u5316\u3059\u308b\u300d\u3068\u3044\u3046\u9055\u3044\u3092\u6574\u7406\u3057\u3066\u899a\u3048\u3066\u304a\u304f\u3068\u6df7\u4e71\u3092\u9632\u3052\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u306e\u8a2d\u5b9a\u624b\u9806<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u3092\u5229\u7528\u3059\u308b\u306b\u306f\u3001\u307e\u305a\u6a5f\u80fd\u3092\u30b9\u30a4\u30c3\u30c1\u5168\u4f53\u3067\u6709\u52b9\u5316\u3057\u3001\u305d\u306e\u5f8c\u5bfe\u8c61\u3068\u306a\u308bVLAN\u3084\u30dd\u30fc\u30c8\u3054\u3068\u306b\u8a73\u7d30\u8a2d\u5b9a\u3092\u884c\u3044\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u8a66\u9a13\u306b\u983b\u51fa\u3059\u308b\u57fa\u672c\u306e\u8a2d\u5b9a\u3068\u3001\u7406\u89e3\u3092\u6df1\u3081\u308b\u305f\u3081\u306e\u4efb\u610f\u8a2d\u5b9a\u3092\u9806\u3092\u8ffd\u3063\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b0\u30ed\u30fc\u30d0\u30eb\u8a2d\u5b9a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305a\u306fDHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u6a5f\u80fd\u3092\u30b9\u30a4\u30c3\u30c1\u5168\u4f53\u3067\u6709\u52b9\u5316\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ip dhcp snooping<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b21\u306b\u3001\u3069\u306eVLAN\u3067DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u3092\u52d5\u4f5c\u3055\u305b\u308b\u304b\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ip dhcp snooping vlan vlan-id &#91; smartlog ]<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>smartlog<\/code> \u3092\u4ed8\u4e0e\u3059\u308b\u3068\u3001\u30c9\u30ed\u30c3\u30d7\u3055\u308c\u305f\u30d1\u30b1\u30c3\u30c8\u60c5\u5831\u3092NetFlow\u53ce\u96c6\u88c5\u7f6e\u3078\u9001\u4fe1\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3055\u3089\u306b\u3001DHCP\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u5bfe\u3057\u3066 <strong>Option 82<\/strong> \u306e\u633f\u5165\u3084\u524a\u9664\u3092\u884c\u3046\u6a5f\u80fd\u3092\u6709\u52b9\u5316\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ip dhcp snooping information option<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u8a2d\u5b9a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u521d\u671f\u72b6\u614b\u3067\u306f\u3001\u3059\u3079\u3066\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304c\u300c\u4fe1\u983c\u3067\u304d\u306a\u3044\uff08Untrusted\uff09\u300d\u3068\u3057\u3066\u6271\u308f\u308c\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001DHCP\u30b5\u30fc\u30d0\u304c\u63a5\u7d9a\u3055\u308c\u308b\u30dd\u30fc\u30c8\u3092\u300c\u4fe1\u983c\u3067\u304d\u308b\uff08Trusted\uff09\u300d\u306b\u5909\u66f4\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# interface interface-id\n(config-if)# ip dhcp snooping trust<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u8a2d\u5b9a\u306b\u3088\u308a\u3001\u305d\u306e\u30dd\u30fc\u30c8\u304b\u3089\u9001\u3089\u308c\u308bDHCP\u5fdc\u7b54\u306f\u6709\u52b9\u3068\u5224\u65ad\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u8a2d\u5b9a\u4f8b<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0b\u306f VLAN100\u30fb200\u30fb300 \u306b\u5bfe\u3057\u3066DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u3092\u6709\u52b9\u306b\u3057\u3001<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Fa0\/1<\/strong> \u3092\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u7528\u306eUntrusted\u30dd\u30fc\u30c8\u306b\u8a2d\u5b9a<\/li>\n\n\n\n<li><strong>Gi0\/1<\/strong> \u3092DHCP\u30b5\u30fc\u30d0\u7528\u306eTrusted\u30dd\u30fc\u30c8\u306b\u8a2d\u5b9a<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3059\u308b\u4f8b\u3067\u3059\u3002\u307e\u305f\u3001Fa0\/1\u306b\u306f1\u79d2\u9593\u3042\u305f\u308a\u306eDHCP\u8981\u6c42\u309230\u30d1\u30b1\u30c3\u30c8\u307e\u3067\u306b\u5236\u9650\u3059\u308b\u8a2d\u5b9a\u3092\u8ffd\u52a0\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SW1(config)# ip dhcp snooping\nSW1(config)# ip dhcp snooping vlan 100,200,300\nSW1(config)# ip dhcp snooping information option\n\nSW1(config)# interface fastethernet 0\/1\nSW1(config-if)# switchport mode access\nSW1(config-if)# switchport access vlan 100\nSW1(config-if)# spanning-tree portfast\nSW1(config-if)# ip dhcp snooping limit rate 30\n\nSW1(config)# interface gigabitethernet 0\/1\nSW1(config-if)# switchport mode trunk\nSW1(config-if)# switchport trunk allowed vlan 100,200,300\nSW1(config-if)# ip dhcp snooping trust<\/code><\/pre>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u3067\u306f\u300c\u3059\u3079\u3066\u306e\u30dd\u30fc\u30c8\u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u3067Untrusted\u300d\u300cDHCP\u30b5\u30fc\u30d0\u306e\u63a5\u7d9a\u30dd\u30fc\u30c8\u3092Trusted\u306b\u3059\u308b\u300d\u70b9\u304c\u3088\u304f\u554f\u308f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u78ba\u8a8d\u30b3\u30de\u30f3\u30c9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u8a2d\u5b9a\u5f8c\u306f\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3067\u52d5\u4f5c\u72b6\u6cc1\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>show ip dhcp snooping<\/code><br>\u2192 \u6709\u52b9\u72b6\u614b\u3001\u5bfe\u8c61VLAN\u3001Trusted\u30dd\u30fc\u30c8\u306e\u78ba\u8a8d<\/li>\n\n\n\n<li><code>show ip dhcp snooping binding<\/code><br>\u2192 \u5b66\u7fd2\u6e08\u307f\u306e\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u30c6\u30fc\u30d6\u30eb\u306e\u78ba\u8a8d<\/li>\n\n\n\n<li><code>show ip dhcp snooping statistics<\/code><br>\u2192 \u30c9\u30ed\u30c3\u30d7\u6570\u306a\u3069\u306e\u7d71\u8a08\u60c5\u5831\u3092\u8868\u793a<\/li>\n\n\n\n<li><code>show ip dhcp snooping database<\/code><br>\u2192 \u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u30c6\u30fc\u30d6\u30eb\u306e\u8a73\u7d30\u72b6\u614b\u3092\u78ba\u8a8d<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u4efb\u610f\u306e\u8ffd\u52a0\u8a2d\u5b9a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u3088\u308a\u5f37\u56fa\u306a\u904b\u7528\u3092\u884c\u3046\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u8a2d\u5b9a\u3082\u5229\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u9001\u4fe1\u5143MAC\u30a2\u30c9\u30ec\u30b9\u306e\u691c\u8a3c<\/strong><br>DHCP\u30d1\u30b1\u30c3\u30c8\u5185\u306e\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30a2\u30c9\u30ec\u30b9\u3068\u5b9f\u969b\u306e\u9001\u4fe1\u5143MAC\u3092\u7167\u5408\u3059\u308b\uff08\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u6709\u52b9\uff09 <code>(config)# ip dhcp snooping verify mac-address<\/code><\/li>\n\n\n\n<li><strong>Option 82\u306e\u30ea\u30e2\u30fc\u30c8ID\u5909\u66f4<\/strong><br>\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u30b9\u30a4\u30c3\u30c1\u306eMAC\u30a2\u30c9\u30ec\u30b9\u304c\u4f7f\u308f\u308c\u307e\u3059\u304c\u3001\u4efb\u610f\u306e\u6587\u5b57\u5217\u3084\u30db\u30b9\u30c8\u540d\u306b\u5909\u66f4\u53ef\u80fd <code>(config)# ip dhcp snooping information option format remote-id hostname<\/code><\/li>\n\n\n\n<li><strong>Option 82\u4ed8\u304d\u306e\u30d1\u30b1\u30c3\u30c8\u3092\u53d7\u3051\u5165\u308c\u308b\u96c6\u7d04\u30b9\u30a4\u30c3\u30c1\u8a2d\u5b9a<\/strong> <code>(config)# ip dhcp snooping information option allow-untrusted<\/code><\/li>\n\n\n\n<li><strong>DHCP\u8981\u6c42\u30ec\u30fc\u30c8\u306e\u5236\u9650<\/strong>\uff08DoS\u653b\u6483\u5bfe\u7b56\uff09 <code>(config-if)# ip dhcp snooping limit rate 30<\/code><\/li>\n\n\n\n<li><strong>\u56de\u7ddaID\u306e\u30ab\u30b9\u30bf\u30de\u30a4\u30ba<\/strong><br>\u30c7\u30d5\u30a9\u30eb\u30c8\u306f <code>vlan-mod-port<\/code> \u5f62\u5f0f\u3060\u304c\u4efb\u610f\u6587\u5b57\u5217\u306b\u5909\u66f4\u53ef\u80fd <code>(config-if)# ip dhcp snooping vlan vlan-id information option format-type circuit-id string CUSTOM-ID<\/code><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u30c6\u30fc\u30d6\u30eb\u306e\u6c38\u7d9a\u5316<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u306e\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u30c6\u30fc\u30d6\u30eb\u306f\u52d5\u7684\u306b\u4f5c\u6210\u3055\u308c\u307e\u3059\u304c\u3001\u30b9\u30a4\u30c3\u30c1\u518d\u8d77\u52d5\u3067\u6d88\u3048\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u3053\u308c\u3092\u9632\u3050\u305f\u3081\u306b\u306f <strong><span class=\"swl-marker mark_yellow\">DHCP\u30b9\u30cc\u30fc\u30d4\u30f3\u30b0\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8<\/span><\/strong>\u3092\u5229\u7528\u3057\u3001\u4fdd\u5b58\u5148URL\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>(config)# ip dhcp snooping database flash:dhcp_snoop.txt<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u30b9\u30a4\u30c3\u30c1\u518d\u8d77\u52d5\u5f8c\u3082\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0\u60c5\u5831\u3092\u5f15\u304d\u7d99\u3052\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-icon_pen wp-block-paragraph\">\u8a66\u9a13\u3067\u306f\u300c\u518d\u8d77\u52d5\u3067\u6d88\u3048\u308b\u300d\u300c\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u6307\u5b9a\u3059\u308c\u3070\u4fdd\u6301\u3067\u304d\u308b\u300d\u3068\u3044\u3046\u70b9\u304c\u51fa\u984c\u3055\u308c\u3084\u3059\u3044\u90e8\u5206\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u25c6\u307e\u3068\u3081\u30b9\u30e9\u30a4\u30c9<\/h2>\n\n\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/ccna-curriculum.tech-village.co.jp\/wp-content\/uploads\/2025\/06\/L2\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\uff08\u30b9\u30d7\u30fc\u30d5\u30a3\u30f3\u30b0\u5bfe\u7b56_DHCP\u7cfb\uff09.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"L2\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\uff08\u30b9\u30d5\u309a\u30fc\u30d5\u30a3\u30f3\u30af\u3099\u5bfe\u7b56_DHCP\u7cfb\uff09\u306e\u57cb\u3081\u8fbc\u307f\u3002\"><\/object><a id=\"wp-block-file--media-a6a8a551-a39d-4f8e-bace-742026cb9877\" 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[&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"swell_btn_cv_data":"","footnotes":""},"categories":[15],"tags":[],"class_list":["post-363","post","type-post","status-publish","format-standard","hentry","category-security"],"_links":{"self":[{"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=\/wp\/v2\/posts\/363","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=363"}],"version-history":[{"count":3,"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=\/wp\/v2\/posts\/363\/revisions"}],"predecessor-version":[{"id":846,"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=\/wp\/v2\/posts\/363\/revisions\/846"}],"wp:attachment":[{"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=363"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=363"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ccna-curriculum.tech-village.co.jp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=363"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}