{"id":1948,"date":"2014-05-01T20:57:10","date_gmt":"2014-05-01T11:57:10","guid":{"rendered":"http:\/\/wp.kaz.bz\/tech\/?page_id=1948"},"modified":"2014-05-02T18:06:31","modified_gmt":"2014-05-02T09:06:31","slug":"dns-resolv","status":"publish","type":"page","link":"https:\/\/wp.kaz.bz\/tech\/etc\/dns-1\/dns-resolv","title":{"rendered":"DNS\u306b\u3088\u308b\u540d\u524d\u89e3\u6c7a\u306e\u52d5\u4f5c\u30d5\u30ed\u30fc\u3002"},"content":{"rendered":"<p><a href=\"\/tech\/etc\/dns-1\/glossary-dns\" title=\"DNS\u7528\u8a9e\u6574\u7406\" target=\"_blank\">DNS\u7528\u8a9e\u6574\u7406<\/a> \u3082\u5408\u308f\u305b\u3066\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>\u95a2\u9023\u3059\u308b\u8981\u7d20<\/h3>\n<p>IPv4 \u306e\u7bc4\u56f2\u3067\u306e\u4f8b\u3067\u3059\u3002<br \/>\n\u4eee\u306b www.example.co.jp\uff08\u4ee5\u964d (www)\uff09 \u306e A\u30ec\u30b3\u30fc\u30c9 \u306e\u540d\u524d\u89e3\u6c7a\u3092\u884c\u3046\u5834\u5408\u3002<br \/>\n\uff08dig \u3067\u8a00\u3048\u3070 dig a www.example.co.jp \uff09<\/p>\n<dl>\n<dt>\u540d\u524d\u89e3\u6c7a\u3092\u3059\u308b\u5bfe\u8c61<\/dt>\n<dd>www.example.co.jp\u3001 \u4ee5\u964d (www) \u306e A\u30ec\u30b3\u30fc\u30c9<\/dd>\n<dt>\uff08\u30b9\u30bf\u30d6)\u30ea\u30be\u30eb\u30d0<\/dt>\n<dd>\u540d\u524d\u89e3\u6c7a\u3092\u8981\u6c42\u3059\u308b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3002 \u4ee5\u964d (R)<\/dd>\n<dt>\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0<\/dt>\n<dd>\u4ee5\u964d (C)<\/dd>\n<dt>example.co.jp \u30c9\u30e1\u30a4\u30f3\u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\uff08\u6a29\u5a01\u30b3\u30f3\u30c6\u30f3\u30c4\u30b5\u30fc\u30d0\uff09 [<sup id=\"fnref-1948-reg-host\"><a href=\"#fn-1948-reg-host\" rel=\"footnote\">1<\/a><\/sup>] [<sup id=\"fnref-1948-co-jp-ns\"><a href=\"#fn-1948-co-jp-ns\" rel=\"footnote\">2<\/a><\/sup>]<\/dt>\n<dd>\u4ee5\u964d (A)<\/dd>\n<dt>jp \u30c9\u30e1\u30a4\u30f3\u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\uff08\u6a29\u5a01\u30b3\u30f3\u30c6\u30f3\u30c4\u30b5\u30fc\u30d0:TLD\u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\uff09[<sup id=\"fnref2:1948-co-jp-ns\"><a href=\"#fn-1948-co-jp-ns\" rel=\"footnote\">2<\/a><\/sup>]<\/dt>\n<dd>\u4ee5\u964d (JP)<\/dd>\n<dt>\u30eb\u30fc\u30c8\u30b5\u30fc\u30d0<\/dt>\n<dd>\u4ee5\u964d (ROOT)<\/dd>\n<\/dl>\n<p>\u306a\u304a\u3001\u305d\u308c\u305e\u308c\u306e\u7279\u5b9a\u306e\u30ec\u30b3\u30fc\u30c9\u3092 (www:A) \u306e\u3088\u3046\u306b\u8868\u8a18\u3057\u307e\u3059\u3002<br \/>\n\u203b\u4e0a\u8a18\u306f\u300cwww.example.co.jp \u306e A\u30ec\u30b3\u30fc\u30c9\u300d\u306e\u610f\u5473<\/p>\n<p>[warning]<br \/>\n\u5358\u7d14\u5316\u306e\u305f\u3081\u3001\u554f\u3044\u5408\u308f\u305b\u305f\u540d\u524d\u306b\u5bfe\u5fdc\u3059\u308b\u30ec\u30b3\u30fc\u30c9\u306f\u3059\u3079\u3066\u7dba\u9e97\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3067\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<br \/>\n\u5b9f\u969b\u306f\u554f\u3044\u5408\u305b\u305f\u969b\u306b\u5bfe\u5fdc\u3059\u308b\u30ec\u30b3\u30fc\u30c9\u304c\u306a\u3044\u3053\u3068\u306b\u3088\u308b\u30cd\u30ac\u30c6\u30a3\u30d6\u30ad\u30e3\u30c3\u30b7\u30e5\u3084\u3001\u4e0d\u9069\u5207\u306aNS\u30ec\u30b3\u30fc\u30c9\u306e\u8a2d\u5b9a\uff08\u5916\u90e8\u540d\u306eNS\u30ec\u30b3\u30fc\u30c9\u3067\u76f8\u4e92\u306b\u5faa\u74b0\u3057\u3066\u3044\u308b\u306a\u3069\uff09\u3001\u6a29\u5a01\u30b5\u30fc\u30d0\u304c\u5fdc\u7b54\u3057\u306a\u3044\u306a\u3069\u3001\u69d8\u3005\u306a\u8981\u56e0\u3067\u306e\u7570\u5e38\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u305d\u308c\u3054\u3068\u306e\u52d5\u4f5c\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001(R) \u81ea\u8eab\u304c\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6301\u3064\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u304c\u3001\u3053\u3053\u3067\u306f(R)\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u306a\u3044\u5834\u5408\u3067\u307e\u3068\u3081\u307e\u3059\u3002<br \/>\n[\/warning]<\/p>\n<p>[note]<br \/>\n(A:NS) \u306f\u540c\u3058\u30c9\u30e1\u30a4\u30f3\u540d\u4e0b\u306e\u30db\u30b9\u30c8\u540d\uff08\u5185\u90e8\u540d\uff09\u3067\u306a\u304f\u3068\u3082\u8a2d\u5b9a\u3067\u304d\u308b\u304c\uff08\u5916\u90e8\u540d)\u3001\u5916\u90e8\u540d\u3067\u3042\u308b\u5834\u5408\u4e0a\u8a18\u624b\u9806 7. \u3067\u5f97\u308b\uff08A:A) \u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u5225\u9014\u540d\u524d\u89e3\u6c7a\u304c\u5fc5\u8981\u3068\u306a\u308b\u3053\u3068\u3001\u305d\u306e\u5916\u90e8\u540d\u306e\u30c9\u30e1\u30a4\u30f3\u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u4e8c\u5168\u3066\u3092\u59d4\u306d\u308b\u3053\u3068\u306b\u306a\u308b\u3053\u3068\u3001\u5916\u90e8\u540d\u306e\u30c9\u30e1\u30a4\u30f3\u3067\u3055\u3089\u306b\u5916\u90e8\u540d\u306eNS\u304c\u4f7f\u308f\u308c\u3066\u3044\u308b\u5834\u5408\u3055\u3089\u306b\u5225\u9014\u540d\u524d\u89e3\u6c7a\u304c\u5fc5\u8981\u3068\u306a\u308b\u3053\u3068\u3001\u306a\u3069\u30ea\u30b9\u30af\u304c\u5927\u304d\u304f\u306a\u308a\u307e\u3059\u3002<br \/>\n[\/note]<br \/>\n\u53c2\u8003\u8cc7\u6599\uff09 <a href=\"http:\/\/www.slideshare.net\/OrangeMorishita\/20111029-part1dnsdis\" class=\"ext-link\" rel=\"external nofollow\" target=\"_blank\">http:\/\/www.slideshare.net\/OrangeMorishita\/20111029-part1dnsdis<\/a><\/p>\n<h3>\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u306a\u3044\u72b6\u614b\u3067\u306e\u691c\u7d22<\/h3>\n<ol>\n<li>(R) \u304c (C) \u306b (www:A) \u3092\u554f\u3044\u5408\u308f\u305b\u308b<\/li>\n<li>(C) \u304c\u81ea\u8eab\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u8a72\u5f53\u30ec\u30b3\u30fc\u30c9\u304c\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002\uff1d\uff1e\u306a\u3044<\/li>\n<li>(C) \u304c (ROOT) \u306b (www:A) \u3092\u554f\u3044\u5408\u308f\u305b\u308b\u3002<\/li>\n<li>(ROOT) \u306f  (www:A) \u3092\u77e5\u3089\u306a\u3044\u306e\u3067\u3001\u81ea\u8eab\u306e\u77e5\u3063\u3066\u3044\u308b (www) \u306e\u6700\u4e0a\u4f4d\u30c9\u30e1\u30a4\u30f3JP \u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0 (JP:NS) \u3068\u3001(JP:A) (\uff1d\u30b0\u30eb\u30fc)\u3092(C)\u306b\u8fd4\u3059\u3002[<sup id=\"fnref-1948-response\"><a href=\"#fn-1948-response\" rel=\"footnote\">3<\/a><\/sup>]<\/li>\n<li>(C) \u304c (JP:NS) \u3068 (JP:A) \u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3059\u308b\u3002<br \/>\n(JP:A) \u306f ADDITIONAL\u306e\u56de\u7b54\u3067\u3042\u308b\u305f\u3081\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u306a\u3044\u5b9f\u88c5\u3082\u3042\u308b\u3002\u4ee5\u4e0b\u540c\u69d8\u3002<\/li>\n<li>(C) \u304c (JP) \u306b (www:A) \u3092\u554f\u3044\u5408\u308f\u305b\u308b\u3002<\/li>\n<li>(JP) \u306f  (www:A) \u3092\u77e5\u3089\u306a\u3044\u306e\u3067\u3001\u81ea\u8eab\u306e\u77e5\u3063\u3066\u3044\u308b (www) \u306e\u6700\u4e0a\u4f4d\u30c9\u30e1\u30a4\u30f3EXAMPLE.CO.JP \u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0 (A:NS) \u3068 (A:A) (\uff1d\u30b0\u30eb\u30fc)\u3092(C)\u306b\u8fd4\u3059\u3002<\/li>\n<li>(C) \u304c (A:NS) \u3068 (A:A) \u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3059\u308b\u3002<\/li>\n<li>(C) \u304c (A) \u306b (www;A) \u3092\u554f\u3044\u5408\u308f\u305b\u308b\u3002<\/li>\n<li>(A) \u306f  (www:A) \u3092\u6301\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u81ea\u8eab\u306e\u77e5\u3063\u3066\u3044\u308b (www:A) \u3092(C)\u306b\u8fd4\u3059\u3002<\/li>\n<li>(C) \u304c (www:A) \u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3059\u308b\u3002<\/li>\n<li>(C) \u304c (R) \u306b\u4e0a\u8a18\u3067\u5f97\u3089\u308c\u305f (www:A) \u3092\u8fd4\u3059\u3002<\/li>\n<\/ol>\n<p>[note]<br \/>\n\u5b9f\u969b\u306f\u5404 NS\u30ec\u30b3\u30fc\u30c9\u3001A\u30ec\u30b3\u30fc\u30c9\u306f\u8907\u6570\u306e\u5fdc\u7b54\u304c\u3042\u308b\u306e\u3067\u305d\u306e\u3046\u3061\u306e\u3069\u306e\u30ec\u30b3\u30fc\u30c9\u304c\u4f7f\u308f\u308c\u308b\u304b\u306f\u5b9f\u88c5\u4f9d\u5b58\u3002<br \/>\n[\/note]<\/p>\n<p>\u3053\u306e\u624b\u9806\u3092dig \u3067\u8868\u3059\u3068\u4e0b\u8a18\u306e\u3088\u3046\u306b\u306a\u308b\u3002<\/p>\n<ol>\n<li>(R): dig a (www) @(C)<\/li>\n<li>(C): <\/li>\n<li>(C): dig a (www) @(ROOT)<\/li>\n<li>(ROOT)\u304b\u3089\u306e\u5fdc\u7b54: (JP:NS) \/ (JP:A)<\/li>\n<li>(C):<\/li>\n<li>(C): dig a (www) @(JP)<\/li>\n<li>(JP)\u304b\u3089\u306e\u5fdc\u7b54: (A:NS) \/ (A:A)<\/li>\n<li>(C):<\/li>\n<li>(C): dig a (www) @(A)<\/li>\n<li>(A)\u304b\u3089\u306e\u5fdc\u7b54: (www:A)<\/li>\n<li>(C):<\/li>\n<li>(C)\u304b\u3089\u306e\u5fdc\u7b54: (www:A)<\/li>\n<\/ol>\n<p>\u306a\u304a\u3001\u3053\u306e\u4e00\u9023\u306e\u540d\u524d\u89e3\u6c7a\uff08\u53cd\u5fa9\u554f\u3044\u5408\u308f\u305b\uff09\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u30ec\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3002<br \/>\n\u5b9f\u88c5\u6b21\u7b2c\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u306a\u3044\u3082\u306e\u3082\u3042\u308a\u3048\u308b\u3002<\/p>\n<ul>\n<li>(JP:NS)<\/li>\n<li>(JP:A)<\/li>\n<li>(A:NS)<\/li>\n<li>(A:A)<\/li>\n<li>(www:A)<\/li>\n<\/ul>\n<p>[note]<br \/>\n\u3064\u307e\u308a\u300c\u6a29\u5a01\u300d\u3068\u8a00\u3063\u3066\u3044\u308b\u306e\u306f <\/p>\n<p>(ROOT) \u304b\u3089\u9806\u6b21\u305f\u3069\u3063\u3066\u305f\u3069\u308a\u7740\u3051\u308bNS\u30ec\u30b3\u30fc\u30c9\u3067\u793a\u3055\u308c\u305f\u540d\u524d\u306b\u5bfe\u5fdc\u3059\u308bA\u30ec\u30b3\u30fc\u30c9\u306eIP\u30a2\u30c9\u30ec\u30b9\u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0<\/p>\n<p>\u3067\u3042\u308a\u3001\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u5074\u3067\u305d\u306e\u30be\u30fc\u30f3\u306e\u30c7\u30fc\u30bf\u3092\u6301\u3063\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<br \/>\n\u6a29\u5a01\u30b5\u30fc\u30d0\u3068\u30b3\u30f3\u30c6\u30f3\u30c4\u30b5\u30fc\u30d0\u306f\u30a4\u30b3\u30fc\u30eb\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p><a href=\"\/tech\/2012\/07\/20\/1222.html\" title=\"\u30ec\u30b8\u30b9\u30c8\u30e9\u304c\u767b\u9332\u30c9\u30e1\u30a4\u30f3\u3092\u3001\u505c\u6b62\u3067\u306f\u306a\u304fNS\u3092\u66f8\u304d\u63db\u3048\u308b\uff08\u305d\u3057\u3066\u30ec\u30b8\u30b9\u30c8\u30ea\u304c\u305d\u308c\u3092\u8a31\u53ef\u3057\u3066\u3044\u308b\uff09\u3001\u3068\u3044\u3046\u3053\u3068\u3002\" target=\"_blank\">\u300c\u30ec\u30b8\u30b9\u30c8\u30e9\u304c\u767b\u9332\u30c9\u30e1\u30a4\u30f3\u3092\u3001\u505c\u6b62\u3067\u306f\u306a\u304fNS\u3092\u66f8\u304d\u63db\u3048\u308b\uff08\u305d\u3057\u3066\u30ec\u30b8\u30b9\u30c8\u30ea\u304c\u305d\u308c\u3092\u8a31\u53ef\u3057\u3066\u3044\u308b\uff09\u3001\u3068\u3044\u3046\u3053\u3068\u3002\u300d<\/a> \u306e\u4ef6\u306f\u3053\u306e\u300c\u6a29\u5a01\u300d\u306e\u6d41\u308c\u3092\u65ad\u3061\u5207\u308b\uff08NS\u30ec\u30b3\u30fc\u30c9\u306e\u524a\u9664)\u306e\u3067\u306f\u306a\u304f\u5225\u306e\u65b9\u5411\u306b\u5411\u3051\u305f\u3082\u306e\u3067\u3001\u305d\u308c\u306f\u4e57\u3063\u53d6\u308a\u3067\u3042\u308b\u3001\u3068\u3044\u3046\u3053\u3068\u304c\u4e3b\u984c\u3067\u3059\u3002<br \/>\n[\/note]<\/p>\n<h3>\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u3042\u308b\u72b6\u614b\u3067\u306e\u540d\u524d\u89e3\u6c7a<\/h3>\n<p>\u4ee5\u4e0b\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u5185\u5bb9\u306f\u4e0a\u8a18\u306e\u3082\u306e\u3068\u3059\u308b\u3002<\/p>\n<h4>(www:A) \u3092\u540d\u524d\u89e3\u6c7a\u3057\u305f\u5834\u5408<\/h4>\n<ol>\n<li>(R) \u304c (C) \u306b (www:A) \u3092\u554f\u3044\u5408\u308f\u305b\u308b<\/li>\n<li>(C) \u304c\u81ea\u8eab\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u8a72\u5f53\u30ec\u30b3\u30fc\u30c9\u304c\u3042\u308aTTL\u3092\u904e\u304e\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002=> \u6709\u52b9\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u30d2\u30c3\u30c8<\/li>\n<li>(C) \u304c (R) \u306b\u4e0a\u8a18\u3067\u5f97\u3089\u308c\u305f (www:A) \u3092\u8fd4\u3059\u3002<\/li>\n<\/ol>\n<h4>www2.example.co.jp \u306eA\u30ec\u30b3\u30fc\u30c9\uff08\u4ee5\u964d (www2:A)\uff09 \u3092\u540d\u524d\u89e3\u6c7a\u3057\u305f\u5834\u5408<\/h4>\n<ol>\n<li>(R) \u304c (C) \u306b (www2:A) \u3092\u554f\u3044\u5408\u308f\u305b\u308b<\/li>\n<li>(C) \u304c\u81ea\u8eab\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u8a72\u5f53\u30ec\u30b3\u30fc\u30c9\u304c\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002\uff1d\uff1e\u306a\u3044\u3002\u305f\u3060\u3057 (A:NS) \/ (A:A) \u306f\u6709\u52b9\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u30d2\u30c3\u30c8<\/li>\n<li>(C) \u304c (A) \u306b (www2:A) \u3092\u554f\u3044\u5408\u308f\u305b\u308b\u3002<\/li>\n<li>(A) \u306f  (www2:A) \u3092\u6301\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u81ea\u8eab\u306e\u77e5\u3063\u3066\u3044\u308b (www2:A) \u3092(C)\u306b\u8fd4\u3059\u3002<\/li>\n<li>(C) \u304c (www2:A) \u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3059\u308b\u3002<\/li>\n<li>(C) \u304c (R) \u306b\u4e0a\u8a18\u3067\u5f97\u3089\u308c\u305f (www2:A) \u3092\u8fd4\u3059\u3002<\/li>\n<\/ol>\n<h4>www3.<em>example2<\/em>.co.jp \u306eA\u30ec\u30b3\u30fc\u30c9\uff08\u4ee5\u964d (www3:A)\uff09 \u3092\u540d\u524d\u89e3\u6c7a\u3057\u305f\u5834\u5408<\/h4>\n<ol>\n<li>(R) \u304c (C) \u306b (www3:A) \u3092\u554f\u3044\u5408\u308f\u305b\u308b<\/li>\n<li>(C) \u304c\u81ea\u8eab\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u8a72\u5f53\u30ec\u30b3\u30fc\u30c9\u304c\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u3002\uff1d\uff1e\u306a\u3044\u3002\u305f\u3060\u3057 (JP:NS) \/ (JP:A) \u306f\u6709\u52b9\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u30d2\u30c3\u30c8<\/li>\n<li>(C) \u304c (JP) \u306b (www3:A) \u3092\u554f\u3044\u5408\u308f\u305b\u308b\u3002<\/li>\n<li>(JP) \u306f  (www3:A) \u3092\u77e5\u3089\u306a\u3044\u306e\u3067\u3001\u81ea\u8eab\u306e\u77e5\u3063\u3066\u3044\u308b (www3) \u306e\u6700\u4e0a\u4f4d\u30c9\u30e1\u30a4\u30f3EXAMPLE2.CO.JP \u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0 (A2:NS) \u3068 (A2:A) (\uff1d\u30b0\u30eb\u30fc)\u3092(C)\u306b\u8fd4\u3059\u3002<\/li>\n<li>(C) \u304c (A2:NS) \u3068 (A2:A) \u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3059\u308b\u3002<\/li>\n<li>(C) \u304c (A2) \u306b (www3;A) \u3092\u554f\u3044\u5408\u308f\u305b\u308b\u3002<\/li>\n<li>(A) \u306f  (www3:A) \u3092\u6301\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u81ea\u8eab\u306e\u77e5\u3063\u3066\u3044\u308b (www3:A) \u3092(C)\u306b\u8fd4\u3059\u3002<\/li>\n<li>(C) \u304c (www3:A) \u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3059\u308b\u3002<\/li>\n<li>(C) \u304c (R) \u306b\u4e0a\u8a18\u3067\u5f97\u3089\u308c\u305f (www3:A) \u3092\u8fd4\u3059\u3002<\/li>\n<\/ol>\n<p>[note]<br \/>\n\u3064\u307e\u308a\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u3066\u3044\u308b\u30ec\u30b3\u30fc\u30c9\u306e\u3046\u3061\u3001\u540d\u524d\u89e3\u6c7a\u306e\u5bfe\u8c61\u306b\u3057\u3066\u3044\u308b\u30c9\u30e1\u30a4\u30f3\u540d\u306e\u76f4\u4e0a\u306e\u30b9\u30fc\u30d1\u30fc\u30c9\u30e1\u30a4\u30f3\uff08\u89aa\u30c9\u30e1\u30a4\u30f3)\u3001\u8a00\u3044\u65b9\u3092\u5909\u3048\u3066\u6b63\u898f\u8868\u73fe\u306e\u3088\u3046\u306b\u8a00\u3046\u3068\u5f8c\u65b9\u6700\u9577\u30de\u30c3\u30c1\u306e\u30c9\u30e1\u30a4\u30f3\u540d\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u63a2\u3057\u3066\u5229\u7528\u3057\u307e\u3059\u3002<br \/>\n[\/note]<\/p>\n<p>[note]<br \/>\n(A) \u3067 (www:A) \u3092\u66f8\u304d\u63db\u3048\u305f\u5834\u5408\uff08IP\u30a2\u30c9\u30ec\u30b9\u3092\u5909\u66f4\u3057\u305f\u5834\u5408)\u306b\u3001\u65b0\u3057\u3044 (www:A) \u3092 (R) \u3067\u5229\u7528\u3059\u308b\u3088\u3046\u306b\u306a\u308b\u306b\u306f (C) \u306e (www:A) \u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u30d2\u30c3\u30c8\u3057\u306a\u304f\u306a\u308a\u518d\u5ea6\u540d\u524d\u691c\u7d22\u3092\u884c\u3063\u305f\u5f8c\u306b\u306a\u308a\u307e\u3059\u3002<br \/>\n(A) \u304b\u3089 (C) \u3084 (R) \u306b\u5909\u66f4\u3092\u901a\u77e5\u3059\u308b\u65b9\u6cd5\u306f\u3042\u308a\u307e\u305b\u3093\uff08\u300c\u6d78\u900f\u300d\u3068\u3044\u3046\u306e\u306b\u3075\u3055\u308f\u3057\u3044\u3088\u3046\u306a\u52d5\u4f5c\u306f\u3069\u3053\u306b\u3082\u3042\u308a\u307e\u305b\u3093\uff09\u3002<br \/>\n[\/note]<\/p>\n<h3>\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u30d2\u30c3\u30c8\u3057\u306a\u304f\u306a\u308b\u30bf\u30a4\u30df\u30f3\u30b0<\/h3>\n<p>\u5927\u304d\u304f\u4ee5\u4e0b\u306e3\u3064\u304c\u8003\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u5404\u30ec\u30b3\u30fc\u30c9\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308bTTL\u3092\u904e\u304e\u305f\u5834\u5408<\/li>\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u306e\u8a2d\u5b9a\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u6709\u52b9\u671f\u9650\u306e\u4e0a\u9650\u304c\u5b9a\u3081\u3089\u308c\u3066\u3044\u308b\u5834\u5408\u3067TTL\u304c\u305d\u308c\u4ee5\u4e0a\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u305d\u306e\u4e0a\u9650\u306b\u305f\u3063\u3057\u305f\u5834\u5408<\/li>\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u306e\u518d\u8d77\u52d5\u306a\u3069\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6d88\u3057\u305f\u5834\u5408<\/li>\n<\/ul>\n<p>(A) \u306e\u7ba1\u7406\u8005\u5074\u3067\u3042\u308b\u7a0b\u5ea6\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3067\u304d\u308b\u306e\u306f\u5404\u30ec\u30b3\u30fc\u30c9\u306b\u8a2d\u5b9a\u3059\u308bTTL\u306e\u307f\u3067\u3042\u308a\u3001\u305d\u308c\u4ee5\u5916\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u5185\u306e\u304d\u3083\u3063\u3057\u3085\u3092\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3059\u308b\u8853\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h3>\u3053\u306e\u52d5\u4f5c\u30d5\u30ed\u30fc\u304b\u3089\u63a8\u5bdf\u3055\u308c\u308b\u30ea\u30b9\u30af<\/h3>\n<p>[warning]<br \/>\nCO.JP \u306e NS\u30ec\u30b3\u30fc\u30c9\u304c\u5b9f\u5728\u3057\u306a\u3044\u306e\u3067\u6b63\u898f\u306b\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u4eee\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306b\u3088\u3063\u3066 CO.JP \u306eNS\u30ec\u30b3\u30fc\u30c9\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30fc\u30d0\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u305b\u308b\u3053\u3068\u306b\u6210\u529f\u3057\u305f\u5834\u5408\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u3066\u3044\u306a\u3044 CO.JP \u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\uff08\u3064\u307e\u308a\uff5e.co.jp\uff09 \u306f\u507d\u306e CO.JP \u306eNS\u30ec\u30b3\u30fc\u30c9\u306b\u5f93\u3044\u540d\u524d\u89e3\u6c7a\u3092\u884c\u3046\u305f\u3081\u3001\u507d\u306e\u5fdc\u7b54\u3092\u5143\u306b\u4ee5\u964d\u306e\u901a\u4fe1\uff08\u4f8b\u3048\u3070Web\u30b5\u30a4\u30c8\u306e\u95b2\u89a7\uff09\u3092\u7d9a\u3051\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u8907\u5408\u7684\u306a\u653b\u6483\u3068\u3057\u3066\u3001\u4f8b\u3048\u3070OpenSSL\u306e\u8106\u5f31\u6027\uff08Heartbleed\uff09\u306b\u3088\u3063\u3066\u4eee\u306bSSL\u8a3c\u660e\u66f8\u304c\u596a\u308f\u308c\u3066\u3044\u305f\u5834\u5408\u3001\u30a2\u30af\u30bb\u30b9\u3057\u3066\u3044\u308bURL\u3068SSL\u8a3c\u660e\u66f8\u306e\u30b3\u30e2\u30f3\u30cd\u30fc\u30e0\u3092\u4e00\u81f4\u3055\u305b\u308b\u3053\u3068\u304c\u51fa\u304d\u308b\u305f\u3081\u3001\u30d6\u30e9\u30a6\u30b6\u306e\u8b66\u544a\u3092\u51fa\u3055\u305a\u306b\u507d\u30b5\u30a4\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u305d\u308c\u3092\u507d\u30b5\u30a4\u30c8\u3060\u3068\u898b\u5206\u3051\u308b\u306e\u306f\u975e\u5e38\u306b\u56f0\u96e3\u3067\u3059\u3002<br \/>\n[\/warning]<\/p>\n<p>\u7d9a\u304d\u306f\u3053\u3061\u3089\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<br \/>\n\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306e\u958b\u3044\u305f\u30d1\u30f3\u30c9\u30e9\u306e\u7bb1 -1- <a href=\"http:\/\/www.e-ontap.com\/dns\/endofdns.html\" class=\"ext-link\" rel=\"external nofollow\" target=\"_blank\">http:\/\/www.e-ontap.com\/dns\/endofdns.html<\/a><br \/>\n\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306e\u958b\u3044\u305f\u30d1\u30f3\u30c9\u30e9\u306e\u7bb1 -2- <a href=\"http:\/\/www.e-ontap.com\/dns\/endofdns2.html\" class=\"ext-link\" rel=\"external nofollow\" target=\"_blank\">http:\/\/www.e-ontap.com\/dns\/endofdns2.html<\/a><br \/>\n\u9577\u5e74\u653e\u7f6e\u3055\u308c\u3066\u304d\u305f DNS \u306e\u6050\u308b\u3079\u304d\u6b20\u9665\u304c\u660e\u3089\u304b\u306b <a href=\"http:\/\/www.e-ontap.com\/blog\/20140415.html\" class=\"ext-link\" rel=\"external nofollow\" target=\"_blank\">http:\/\/www.e-ontap.com\/blog\/20140415.html<\/a><\/p>\n<div class=\"footnotes\">\n<hr \/>\n<ol>\n<li id=\"fn-1948-reg-host\">\n\u30ec\u30b8\u30b9\u30c8\u30e9\u306e\u7ba1\u7406\u753b\u9762\u306a\u3069\u3067\u767b\u9332\u3057\u3066\u3044\u308b\u300c\u30db\u30b9\u30c8\u767b\u9332\u300d\u306a\u3069\u3068\u8868\u73fe\u3055\u308c\u3066\u3044\u308b\u9805\u76ee\u306f (A:A) \u3092\u6307\u5b9a\u3059\u308b\u8a2d\u5b9a\u3067\u3042\u308a\u3001\u300c\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u767b\u9332\u300d\u306a\u3069\u3068\u8868\u73fe\u3055\u308c\u3066\u3044\u308b\u9805\u76ee\u306f (A:NS) \u306e\u767b\u9332\u306b\u5bfe\u5fdc\u3059\u308b\u3002&#160;<a href=\"#fnref-1948-reg-host\" rev=\"footnote\">&#8617;<\/a>\n<\/li>\n<li id=\"fn-1948-co-jp-ns\">\n\u968e\u5c64\u7684\u3068\u8a00\u3046\u610f\u5473\u3067\u306f\u3001TLD\u3067\u3042\u308bJP\u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u304cexample.co.jp \u306b\u5bfe\u3057\u3066\u7b54\u3048\u308b\u306e\u306f CO.JP 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