{"id":5576,"date":"2025-08-09T19:41:45","date_gmt":"2025-08-09T10:41:45","guid":{"rendered":"https:\/\/sky-peace.net\/?p=5576"},"modified":"2025-08-09T19:41:45","modified_gmt":"2025-08-09T10:41:45","slug":"transport-layer","status":"publish","type":"post","link":"https:\/\/sky-peace.net\/certified\/transport-layer\/","title":{"rendered":"\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u5c64\u306eTCP\u3068UDP\u5fb9\u5e95\u89e3\u8aac\u2502\u30dd\u30fc\u30c8\u756a\u53f7\u30fbMSS\/MTU\u30fb\u518d\u9001\u5236\u5fa1\u307e\u3067\u8a66\u9a13\u5bfe\u7b56\u5b8c\u5168\u30ac\u30a4\u30c9"},"content":{"rendered":"<p>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u4e16\u754c\u3067\u300c\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u5c64\u300d\u3068\u805e\u304f\u3068\u3001\u8a66\u9a13\u52c9\u5f37\u3067\u3082\u5b9f\u52d9\u3067\u3082\u5fc5\u305a\u767b\u5834\u3059\u308b\u306e\u304c <strong>TCP<\/strong> \u3068 <strong>UDP<\/strong> \u3067\u3059\u3002\u3053\u308c\u3089\u306f\u3069\u3061\u3089\u3082\u300c\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u540c\u58eb\u3092\u3064\u306a\u3050\u300d\u5f79\u5272\u3092\u6301\u3061\u307e\u3059\u304c\u3001\u52d5\u4f5c\u306e\u4ed5\u7d44\u307f\u3084\u4fe1\u983c\u6027\u306e\u78ba\u4fdd\u65b9\u6cd5\u304c\u5927\u304d\u304f\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001TCP \u306f\u624b\u7d19\u3092\u914d\u9054\u3059\u308b\u90f5\u4fbf\u5c40\u54e1\u306e\u3088\u3046\u306b\u3001\u76f8\u624b\u304c\u53d7\u3051\u53d6\u3063\u305f\u304b\u3092\u9010\u4e00\u78ba\u8a8d\u3057\u306a\u304c\u3089\u5c4a\u3051\u307e\u3059\u3002\u4e00\u65b9\u3001UDP \u306f\u5b85\u914d\u4fbf\u306e\u7f6e\u304d\u914d\u306e\u3088\u3046\u306b\u300c\u9001\u308a\u3063\u3071\u306a\u3057\u300d\u3067\u3001\u5c4a\u3044\u305f\u304b\u3069\u3046\u304b\u306f\u6c17\u306b\u3057\u307e\u305b\u3093\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u5c64\u306b\u306f <strong>\u30dd\u30fc\u30c8\u756a\u53f7<\/strong> \u3068\u3044\u3046\u300c\u5b9b\u5148\u30a2\u30d7\u30ea\u306e\u4f4f\u6240\u300d\u304c\u3042\u308a\u3001\u30a6\u30a7\u30eb\u30ce\u30a6\u30f3\u30dd\u30fc\u30c8\u306e\u3088\u3046\u306b\u6c7a\u3081\u3089\u308c\u305f\u756a\u53f7\u3082\u5b58\u5728\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u756a\u53f7\u306f\u3001\u30a6\u30a7\u30d6\u30a2\u30af\u30bb\u30b9\u3084\u30e1\u30fc\u30eb\u9001\u53d7\u4fe1\u3001\u52d5\u753b\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u306a\u3069\u3001\u65e5\u5e38\u7684\u306a\u901a\u4fe1\u306e\u88cf\u5074\u3067\u6d3b\u8e8d\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001<\/p>\n<ul>\n<li>TCP \u3068 UDP \u306e\u9055\u3044<\/li>\n<li>\u30dd\u30fc\u30c8\u756a\u53f7\u306e\u7a2e\u985e\u3068\u30a6\u30a7\u30eb\u30ce\u30a6\u30f3\u30dd\u30fc\u30c8\u306e\u4ee3\u8868\u4f8b<\/li>\n<li>TCP \u306e\u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u78ba\u7acb\u306e\u6d41\u308c<\/li>\n<li>MSS \u3068 MTU \u306e\u95a2\u4fc2\u3001\u30d5\u30e9\u30b0\u30e1\u30f3\u30c8\u51e6\u7406<\/li>\n<li>\u901a\u4fe1\u969c\u5bb3\u6642\u306e\u518d\u9001\u6761\u4ef6<\/li>\n<li>TCP\/UDP \u30d8\u30c3\u30c0\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/li>\n<li>UDP \u3068\u95a2\u4fc2\u306e\u6df1\u3044\u30d7\u30ed\u30c8\u30b3\u30eb<\/li>\n<li>\u30b9\u30e9\u30a4\u30c7\u30a3\u30f3\u30b0\u30a6\u30a3\u30f3\u30c9\u30a6\u3068\u30d5\u30ed\u30fc\u5236\u5fa1\u306e\u4ed5\u7d44\u307f<\/li>\n<\/ul>\n<p>\u3092\u4f53\u7cfb\u7684\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002\u56f3\u89e3\u3084\u5177\u4f53\u4f8b\u3092\u4ea4\u3048\u3066\u3001\u8a66\u9a13\u5bfe\u7b56\u3060\u3051\u3067\u306a\u304f\u5b9f\u52d9\u3067\u3082\u4f7f\u3048\u308b\u77e5\u8b58\u3092\u8eab\u306b\u3064\u3051\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<hr>\n<h2>TCP\u3068UDP\u306e\u9055\u3044\u2502\u4fe1\u983c\u6027\u30fb\u901f\u5ea6\u30fb\u7528\u9014\u306e\u6bd4\u8f03<\/h2>\n<p>\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u5c64\u306e\u4ee3\u8868\u7684\u306a\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3042\u308b <strong>TCP\uff08Transmission Control Protocol\uff09<\/strong> \u3068 <strong>UDP\uff08User Datagram Protocol\uff09<\/strong> \u306f\u3001\u3069\u3061\u3089\u3082\u300c\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u540c\u58eb\u3067\u30c7\u30fc\u30bf\u3092\u3084\u308a\u53d6\u308a\u3059\u308b\u300d\u5f79\u5272\u3092\u62c5\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u901a\u4fe1\u65b9\u5f0f\u3084\u4fe1\u983c\u6027\u306e\u78ba\u4fdd\u65b9\u6cd5\u306b\u5927\u304d\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>1. \u4fe1\u983c\u6027\u306e\u78ba\u4fdd<\/h3>\n<ul>\n<li><strong>TCP<\/strong>\uff1a\u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u578b\uff08\u63a5\u7d9a\u6307\u5411\uff09\u3002\u901a\u4fe1\u958b\u59cb\u524d\u306b\u300c\u4e09\u8005\u9593\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\uff083-way handshake\uff09\u300d\u3092\u884c\u3044\u3001\u53cc\u65b9\u306e\u6e96\u5099\u304c\u6574\u3063\u305f\u72b6\u614b\u3067\u30c7\u30fc\u30bf\u3092\u9001\u308b\u3002\u5230\u9054\u78ba\u8a8d\u30fb\u9806\u5e8f\u4fdd\u8a3c\u30fb\u518d\u9001\u5236\u5fa1\u3042\u308a\u3002<\/li>\n<li><strong>UDP<\/strong>\uff1a\u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u30ec\u30b9\u578b\u3002\u76f8\u624b\u304c\u53d7\u3051\u53d6\u3063\u305f\u304b\u3092\u78ba\u8a8d\u305b\u305a\u9001\u4fe1\u3002\u9806\u5e8f\u4fdd\u8a3c\u30fb\u518d\u9001\u306f\u884c\u308f\u306a\u3044\u3002<\/li>\n<\/ul>\n<h3>2. \u901f\u5ea6\u3068\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9<\/h3>\n<ul>\n<li><strong>TCP<\/strong>\uff1a\u4fe1\u983c\u6027\u306e\u305f\u3081\u306e\u5236\u5fa1\u60c5\u5831\u304c\u591a\u304f\u3001\u30d8\u30c3\u30c0\u306f20\u30d0\u30a4\u30c8\u4ee5\u4e0a\u3002\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u304c\u5897\u3048\u3084\u3059\u304f\u76f8\u5bfe\u7684\u306b\u9045\u3044\u3002<\/li>\n<li><strong>UDP<\/strong>\uff1a\u6700\u5c0f\u9650\u306e\u30d8\u30c3\u30c0\uff088\u30d0\u30a4\u30c8\uff09\u3067\u30b7\u30f3\u30d7\u30eb\u3002\u9ad8\u901f\u30fb\u4f4e\u9045\u5ef6\u306b\u306a\u308a\u3084\u3059\u3044\u3002<\/li>\n<\/ul>\n<h3>3. \u7528\u9014\u306e\u9055\u3044\uff08\u4f8b\uff09<\/h3>\n<table>\n<thead>\n<tr>\n<th>\u7528\u9014<\/th>\n<th>TCP<\/th>\n<th>UDP<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Web\u30d6\u30e9\u30a6\u30b8\u30f3\u30b0<\/td>\n<td>\u25ce\uff08HTTP\/HTTPS\uff09<\/td>\n<td>\u00d7<\/td>\n<\/tr>\n<tr>\n<td>\u30e1\u30fc\u30eb\u9001\u4fe1\uff08SMTP\uff09<\/td>\n<td>\u25ce<\/td>\n<td>\u00d7<\/td>\n<\/tr>\n<tr>\n<td>\u97f3\u58f0\u901a\u8a71\uff08VoIP\uff09<\/td>\n<td>\u25b3<\/td>\n<td>\u25ce<\/td>\n<\/tr>\n<tr>\n<td>\u30aa\u30f3\u30e9\u30a4\u30f3\u30b2\u30fc\u30e0<\/td>\n<td>\u25b3\uff08\u9045\u5ef6\u306b\u5f31\u3044\uff09<\/td>\n<td>\u25ce\uff08\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u6027\u91cd\u8996\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>4. \u8eab\u8fd1\u306a\u4f8b\u3048<\/h3>\n<ul>\n<li><strong>TCP<\/strong>\uff1a\u5b85\u914d\u4fbf\u306e\u5bfe\u9762\u53d7\u3051\u53d6\u308a\u3002\u53d7\u9818\u30b5\u30a4\u30f3\u3067\u300c\u78ba\u5b9f\u306b\u5c4a\u3044\u305f\u300d\u3092\u78ba\u8a8d\u3002<\/li>\n<li><strong>UDP<\/strong>\uff1a\u30dd\u30b9\u30c8\u6295\u51fd\u306e\u30c1\u30e9\u30b7\u914d\u308a\u3002\u914d\u3063\u305f\u3042\u3068\u306e\u53d7\u53d6\u78ba\u8a8d\u306f\u3057\u306a\u3044\u3002<\/li>\n<\/ul>\n<hr>\n<h2>\u30dd\u30fc\u30c8\u756a\u53f7\u306e\u7a2e\u985e\u3068\u30a6\u30a7\u30eb\u30ce\u30a6\u30f3\u30dd\u30fc\u30c8\u306e\u4ee3\u8868\u4f8b\u2502\u8a66\u9a13\u983b\u51fa\u306e\u899a\u3048\u65b9<\/h2>\n<p>\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u5c64\u3067\u306f\u3001\u9001\u4fe1\u5143\u30fb\u5b9b\u5148\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u8b58\u5225\u3059\u308b\u305f\u3081\u306b <strong>\u30dd\u30fc\u30c8\u756a\u53f7<\/strong> \u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u30dd\u30fc\u30c8\u756a\u53f7\u306f 0\uff5e65535 \u306e\u7bc4\u56f2\u3067\u5272\u308a\u5f53\u3066\u3089\u308c\u3001\u7528\u9014\u306b\u5fdc\u3058\u3066\u6b21\u306e3\u533a\u5206\u306b\u5206\u985e\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>1. \u30dd\u30fc\u30c8\u756a\u53f7\u306e\u5206\u985e<\/h3>\n<table>\n<thead>\n<tr>\n<th>\u7bc4\u56f2<\/th>\n<th>\u540d\u79f0<\/th>\n<th>\u7528\u9014\u4f8b<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0\uff5e1023<\/td>\n<td><strong>\u30a6\u30a7\u30eb\u30ce\u30a6\u30f3\u30dd\u30fc\u30c8\uff08Well-known ports\uff09<\/strong><\/td>\n<td>HTTP(80), HTTPS(443), FTP(21), SMTP(25) \u306a\u3069\u6a19\u6e96\u5316\u30b5\u30fc\u30d3\u30b9<\/td>\n<\/tr>\n<tr>\n<td>1024\uff5e49151<\/td>\n<td><strong>\u767b\u9332\u30dd\u30fc\u30c8\uff08Registered ports\uff09<\/strong><\/td>\n<td>\u7279\u5b9a\u30a2\u30d7\u30ea\u3084\u4f01\u696d\u304c\u7533\u8acb\u3057\u3066\u4f7f\u7528<\/td>\n<\/tr>\n<tr>\n<td>49152\uff5e65535<\/td>\n<td><strong>\u52d5\u7684\uff0f\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30dd\u30fc\u30c8\uff08Dynamic\/Private ports\uff09<\/strong><\/td>\n<td>\u4e00\u6642\u7684\u306a\u901a\u4fe1\u3084\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u81ea\u52d5\u5272\u308a\u5f53\u3066<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>2. \u30a6\u30a7\u30eb\u30ce\u30a6\u30f3\u30dd\u30fc\u30c8\u306e\u8a66\u9a13\u983b\u51fa\u4f8b<\/h3>\n<table>\n<thead>\n<tr>\n<th>\u30d7\u30ed\u30c8\u30b3\u30eb<\/th>\n<th>\u30dd\u30fc\u30c8\u756a\u53f7<\/th>\n<th>\u7528\u9014<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>HTTP<\/td>\n<td>80<\/td>\n<td>Web\u30a2\u30af\u30bb\u30b9<\/td>\n<\/tr>\n<tr>\n<td>HTTPS<\/td>\n<td>443<\/td>\n<td>\u6697\u53f7\u5316\u3055\u308c\u305fWeb\u30a2\u30af\u30bb\u30b9<\/td>\n<\/tr>\n<tr>\n<td>FTP<\/td>\n<td>21<\/td>\n<td>\u30d5\u30a1\u30a4\u30eb\u8ee2\u9001\uff08\u5236\u5fa1\u7528\uff09<\/td>\n<\/tr>\n<tr>\n<td>SMTP<\/td>\n<td>25<\/td>\n<td>\u30e1\u30fc\u30eb\u9001\u4fe1<\/td>\n<\/tr>\n<tr>\n<td>DNS<\/td>\n<td>53<\/td>\n<td>\u540d\u524d\u89e3\u6c7a<\/td>\n<\/tr>\n<tr>\n<td>SSH<\/td>\n<td>22<\/td>\n<td>\u30ea\u30e2\u30fc\u30c8\u30ed\u30b0\u30a4\u30f3\u306e\u6697\u53f7\u5316\u901a\u4fe1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>3. \u8eab\u8fd1\u306a\u4f8b\u3048<\/h3>\n<p>\u30dd\u30fc\u30c8\u756a\u53f7\u306f\u30a2\u30d1\u30fc\u30c8\u306e\u300c\u90e8\u5c4b\u756a\u53f7\u300d\u306b\u76f8\u5f53\u3057\u307e\u3059\u3002\u30a2\u30d1\u30fc\u30c8\uff08IP\u30a2\u30c9\u30ec\u30b9\uff09\u3060\u3051\u3067\u306f\u3069\u306e\u4f4f\u4eba\uff08\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\uff09\u306b\u8377\u7269\u3092\u5c4a\u3051\u308b\u304b\u5206\u304b\u3089\u306a\u3044\u305f\u3081\u3001\u90e8\u5c4b\u756a\u53f7\uff08\u30dd\u30fc\u30c8\u756a\u53f7\uff09\u306e\u6307\u5b9a\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<h2>TCP\u3068UDP\u306e\u9055\u3044\u2502\u4fe1\u983c\u6027\u30fb\u901f\u5ea6\u30fb\u7528\u9014\u306e\u6bd4\u8f03<\/h2>\n<p>\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u5c64\u306e\u4ee3\u8868\u7684\u306a\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3042\u308b <strong>TCP\uff08Transmission Control Protocol\uff09<\/strong> \u3068 <strong>UDP\uff08User Datagram Protocol\uff09<\/strong> \u306f\u3001\u3069\u3061\u3089\u3082\u300c\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u540c\u58eb\u3067\u30c7\u30fc\u30bf\u3092\u3084\u308a\u53d6\u308a\u3059\u308b\u300d\u5f79\u5272\u3092\u62c5\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u901a\u4fe1\u65b9\u5f0f\u3084\u4fe1\u983c\u6027\u306e\u78ba\u4fdd\u65b9\u6cd5\u306b\u5927\u304d\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>1. \u4fe1\u983c\u6027\u306e\u78ba\u4fdd<\/h3>\n<ul>\n<li><strong>TCP<\/strong>\uff1a\u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u578b\uff08\u63a5\u7d9a\u6307\u5411\uff09\u3002\u901a\u4fe1\u958b\u59cb\u524d\u306b\u300c\u4e09\u8005\u9593\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\uff083-way handshake\uff09\u300d\u3092\u884c\u3044\u3001\u53cc\u65b9\u306e\u6e96\u5099\u304c\u6574\u3063\u305f\u72b6\u614b\u3067\u30c7\u30fc\u30bf\u3092\u9001\u308b\u3002\u5230\u9054\u78ba\u8a8d\u30fb\u9806\u5e8f\u4fdd\u8a3c\u30fb\u518d\u9001\u5236\u5fa1\u3042\u308a\u3002<\/li>\n<li><strong>UDP<\/strong>\uff1a\u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u30ec\u30b9\u578b\u3002\u76f8\u624b\u304c\u53d7\u3051\u53d6\u3063\u305f\u304b\u3092\u78ba\u8a8d\u305b\u305a\u9001\u4fe1\u3002\u9806\u5e8f\u4fdd\u8a3c\u30fb\u518d\u9001\u306f\u884c\u308f\u306a\u3044\u3002<\/li>\n<\/ul>\n<h3>2. \u901f\u5ea6\u3068\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9<\/h3>\n<ul>\n<li><strong>TCP<\/strong>\uff1a\u4fe1\u983c\u6027\u306e\u305f\u3081\u306e\u5236\u5fa1\u60c5\u5831\u304c\u591a\u304f\u3001\u30d8\u30c3\u30c0\u306f20\u30d0\u30a4\u30c8\u4ee5\u4e0a\u3002\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u304c\u5897\u3048\u3084\u3059\u304f\u76f8\u5bfe\u7684\u306b\u9045\u3044\u3002<\/li>\n<li><strong>UDP<\/strong>\uff1a\u6700\u5c0f\u9650\u306e\u30d8\u30c3\u30c0\uff088\u30d0\u30a4\u30c8\uff09\u3067\u30b7\u30f3\u30d7\u30eb\u3002\u9ad8\u901f\u30fb\u4f4e\u9045\u5ef6\u306b\u306a\u308a\u3084\u3059\u3044\u3002<\/li>\n<\/ul>\n<h3>3. \u7528\u9014\u306e\u9055\u3044\uff08\u4f8b\uff09<\/h3>\n<table>\n<thead>\n<tr>\n<th>\u7528\u9014<\/th>\n<th>TCP<\/th>\n<th>UDP<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Web\u30d6\u30e9\u30a6\u30b8\u30f3\u30b0<\/td>\n<td>\u25ce\uff08HTTP\/HTTPS\uff09<\/td>\n<td>\u00d7<\/td>\n<\/tr>\n<tr>\n<td>\u30e1\u30fc\u30eb\u9001\u4fe1\uff08SMTP\uff09<\/td>\n<td>\u25ce<\/td>\n<td>\u00d7<\/td>\n<\/tr>\n<tr>\n<td>\u97f3\u58f0\u901a\u8a71\uff08VoIP\uff09<\/td>\n<td>\u25b3<\/td>\n<td>\u25ce<\/td>\n<\/tr>\n<tr>\n<td>\u30aa\u30f3\u30e9\u30a4\u30f3\u30b2\u30fc\u30e0<\/td>\n<td>\u25b3\uff08\u9045\u5ef6\u306b\u5f31\u3044\uff09<\/td>\n<td>\u25ce\uff08\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u6027\u91cd\u8996\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>4. \u8eab\u8fd1\u306a\u4f8b\u3048<\/h3>\n<ul>\n<li><strong>TCP<\/strong>\uff1a\u5b85\u914d\u4fbf\u306e\u5bfe\u9762\u53d7\u3051\u53d6\u308a\u3002\u53d7\u9818\u30b5\u30a4\u30f3\u3067\u300c\u78ba\u5b9f\u306b\u5c4a\u3044\u305f\u300d\u3092\u78ba\u8a8d\u3002<\/li>\n<li><strong>UDP<\/strong>\uff1a\u30dd\u30b9\u30c8\u6295\u51fd\u306e\u30c1\u30e9\u30b7\u914d\u308a\u3002\u914d\u3063\u305f\u3042\u3068\u306e\u53d7\u53d6\u78ba\u8a8d\u306f\u3057\u306a\u3044\u3002<\/li>\n<\/ul>\n<hr>\n<h2>\u30dd\u30fc\u30c8\u756a\u53f7\u306e\u7a2e\u985e\u3068\u30a6\u30a7\u30eb\u30ce\u30a6\u30f3\u30dd\u30fc\u30c8\u306e\u4ee3\u8868\u4f8b\u2502\u8a66\u9a13\u983b\u51fa\u306e\u899a\u3048\u65b9<\/h2>\n<p>\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u5c64\u3067\u306f\u3001\u9001\u4fe1\u5143\u30fb\u5b9b\u5148\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u8b58\u5225\u3059\u308b\u305f\u3081\u306b <strong>\u30dd\u30fc\u30c8\u756a\u53f7<\/strong> \u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u30dd\u30fc\u30c8\u756a\u53f7\u306f 0\uff5e65535 \u306e\u7bc4\u56f2\u3067\u5272\u308a\u5f53\u3066\u3089\u308c\u3001\u7528\u9014\u306b\u5fdc\u3058\u3066\u6b21\u306e3\u533a\u5206\u306b\u5206\u985e\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>1. \u30dd\u30fc\u30c8\u756a\u53f7\u306e\u5206\u985e<\/h3>\n<table>\n<thead>\n<tr>\n<th>\u7bc4\u56f2<\/th>\n<th>\u540d\u79f0<\/th>\n<th>\u7528\u9014\u4f8b<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>0\uff5e1023<\/td>\n<td><strong>\u30a6\u30a7\u30eb\u30ce\u30a6\u30f3\u30dd\u30fc\u30c8\uff08Well-known ports\uff09<\/strong><\/td>\n<td>HTTP(80), HTTPS(443), FTP(21), SMTP(25) \u306a\u3069\u6a19\u6e96\u5316\u30b5\u30fc\u30d3\u30b9<\/td>\n<\/tr>\n<tr>\n<td>1024\uff5e49151<\/td>\n<td><strong>\u767b\u9332\u30dd\u30fc\u30c8\uff08Registered ports\uff09<\/strong><\/td>\n<td>\u7279\u5b9a\u30a2\u30d7\u30ea\u3084\u4f01\u696d\u304c\u7533\u8acb\u3057\u3066\u4f7f\u7528<\/td>\n<\/tr>\n<tr>\n<td>49152\uff5e65535<\/td>\n<td><strong>\u52d5\u7684\uff0f\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30dd\u30fc\u30c8\uff08Dynamic\/Private ports\uff09<\/strong><\/td>\n<td>\u4e00\u6642\u7684\u306a\u901a\u4fe1\u3084\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u81ea\u52d5\u5272\u308a\u5f53\u3066<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>2. \u30a6\u30a7\u30eb\u30ce\u30a6\u30f3\u30dd\u30fc\u30c8\u306e\u8a66\u9a13\u983b\u51fa\u4f8b<\/h3>\n<table>\n<thead>\n<tr>\n<th>\u30d7\u30ed\u30c8\u30b3\u30eb<\/th>\n<th>\u30dd\u30fc\u30c8\u756a\u53f7<\/th>\n<th>\u7528\u9014<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>HTTP<\/td>\n<td>80<\/td>\n<td>Web\u30a2\u30af\u30bb\u30b9<\/td>\n<\/tr>\n<tr>\n<td>HTTPS<\/td>\n<td>443<\/td>\n<td>\u6697\u53f7\u5316\u3055\u308c\u305fWeb\u30a2\u30af\u30bb\u30b9<\/td>\n<\/tr>\n<tr>\n<td>FTP<\/td>\n<td>21<\/td>\n<td>\u30d5\u30a1\u30a4\u30eb\u8ee2\u9001\uff08\u5236\u5fa1\u7528\uff09<\/td>\n<\/tr>\n<tr>\n<td>SMTP<\/td>\n<td>25<\/td>\n<td>\u30e1\u30fc\u30eb\u9001\u4fe1<\/td>\n<\/tr>\n<tr>\n<td>DNS<\/td>\n<td>53<\/td>\n<td>\u540d\u524d\u89e3\u6c7a<\/td>\n<\/tr>\n<tr>\n<td>SSH<\/td>\n<td>22<\/td>\n<td>\u30ea\u30e2\u30fc\u30c8\u30ed\u30b0\u30a4\u30f3\u306e\u6697\u53f7\u5316\u901a\u4fe1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>3. \u8eab\u8fd1\u306a\u4f8b\u3048<\/h3>\n<p>\u30dd\u30fc\u30c8\u756a\u53f7\u306f\u30a2\u30d1\u30fc\u30c8\u306e\u300c\u90e8\u5c4b\u756a\u53f7\u300d\u306b\u76f8\u5f53\u3057\u307e\u3059\u3002\u30a2\u30d1\u30fc\u30c8\uff08IP\u30a2\u30c9\u30ec\u30b9\uff09\u3060\u3051\u3067\u306f\u3069\u306e\u4f4f\u4eba\uff08\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\uff09\u306b\u8377\u7269\u3092\u5c4a\u3051\u308b\u304b\u5206\u304b\u3089\u306a\u3044\u305f\u3081\u3001\u90e8\u5c4b\u756a\u53f7\uff08\u30dd\u30fc\u30c8\u756a\u53f7\uff09\u306e\u6307\u5b9a\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<h2>TCP\u306e\u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u78ba\u7acb\u3068\u7d42\u4e86\u2502MSS\u6c7a\u5b9a\u3068MTU\u30fb\u30d5\u30e9\u30b0\u30e1\u30f3\u30c8\u51e6\u7406\u307e\u3067<\/h2>\n<p>TCP\u306f\u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u578b\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3042\u308a\u3001\u901a\u4fe1\u306e\u958b\u59cb\u304b\u3089\u7d42\u4e86\u307e\u3067\u306b\u660e\u78ba\u306a\u624b\u9806\u304c\u3042\u308a\u307e\u3059\u3002\u52a0\u3048\u3066\u3001\u30c7\u30fc\u30bf\u9001\u4fe1\u6642\u306b\u306fMSS\uff08Maximum Segment Size\uff09\u3084MTU\uff08Maximum Transmission Unit\uff09\u3092\u8003\u616e\u3057\u3066\u30d1\u30b1\u30c3\u30c8\u3092\u5206\u5272\u3057\u307e\u3059\u3002<\/p>\n<h3>1. \u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u78ba\u7acb\uff083-way handshake\uff09<\/h3>\n<p>TCP\u901a\u4fe1\u3067\u306f\u3001\u30c7\u30fc\u30bf\u9001\u4fe1\u524d\u306b\u6b21\u306e3\u30b9\u30c6\u30c3\u30d7\u3067\u63a5\u7d9a\u3092\u78ba\u7acb\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li><strong>SYN<\/strong>\uff08Synchronize\uff09\uff1a\u30af\u30e9\u30a4\u30a2\u30f3\u30c8 \u2192 \u30b5\u30fc\u30d0\u3078\u63a5\u7d9a\u8981\u6c42\u3092\u9001\u4fe1<\/li>\n<li><strong>SYN-ACK<\/strong>\uff08Synchronize-Acknowledge\uff09\uff1a\u30b5\u30fc\u30d0 \u2192 \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3078\u63a5\u7d9a\u627f\u8afe\u3068\u8981\u6c42\u306e\u5fdc\u7b54<\/li>\n<li><strong>ACK<\/strong>\uff08Acknowledge\uff09\uff1a\u30af\u30e9\u30a4\u30a2\u30f3\u30c8 \u2192 \u30b5\u30fc\u30d0\u3078\u5fdc\u7b54\u3092\u9001\u308a\u3001\u901a\u4fe1\u6e96\u5099\u5b8c\u4e86<\/li>\n<\/ol>\n<p><em>\u4f8b\u3048\uff1a<\/em>\u96fb\u8a71\u3092\u304b\u3051\u3066\u300c\u3082\u3057\u3082\u3057\uff08SYN\uff09\u300d\u2192\u300c\u3082\u3057\u3082\u3057\u805e\u3053\u3048\u307e\u3059\uff08SYN-ACK\uff09\u300d\u2192\u300c\u805e\u3053\u3048\u307e\u3057\u305f\u3001\u59cb\u3081\u307e\u3057\u3087\u3046\uff08ACK\uff09\u300d\u306e\u6d41\u308c\u3002<\/p>\n<h3>2. \u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u7d42\u4e86\uff084-way handshake\uff09<\/h3>\n<p>\u901a\u4fe1\u3092\u7d42\u4e86\u3059\u308b\u969b\u306f\u3001\u6b21\u306e4\u30b9\u30c6\u30c3\u30d7\u3092\u8e0f\u307f\u307e\u3059\u3002<\/p>\n<ol>\n<li><strong>FIN<\/strong>\uff1a\u9001\u4fe1\u5074\u304c\u300c\u3082\u3046\u9001\u308b\u30c7\u30fc\u30bf\u306f\u3042\u308a\u307e\u305b\u3093\u300d\u3068\u901a\u77e5<\/li>\n<li><strong>ACK<\/strong>\uff1a\u53d7\u4fe1\u5074\u304c\u300c\u4e86\u89e3\u300d\u3068\u5fdc\u7b54<\/li>\n<li><strong>FIN<\/strong>\uff1a\u53d7\u4fe1\u5074\u304b\u3089\u3082\u7d42\u4e86\u901a\u77e5<\/li>\n<li><strong>ACK<\/strong>\uff1a\u9001\u4fe1\u5074\u304c\u5fdc\u7b54\u3057\u63a5\u7d9a\u7d42\u4e86<\/li>\n<\/ol>\n<h3>3. MSS\u3068MTU\u306e\u95a2\u4fc2<\/h3>\n<ul>\n<li><strong>MTU<\/strong>\uff08\u6700\u5927\u8ee2\u9001\u5358\u4f4d\uff09\uff1a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5c64\uff08IP\uff09\u306e\u6700\u5927\u30c7\u30fc\u30bf\u9577\u3002\u30a4\u30fc\u30b5\u30cd\u30c3\u30c8\u3067\u306f\u901a\u5e38 <strong>1500\u30d0\u30a4\u30c8<\/strong>\u3002<\/li>\n<li><strong>MSS<\/strong>\uff08\u6700\u5927\u30bb\u30b0\u30e1\u30f3\u30c8\u30b5\u30a4\u30ba\uff09\uff1aTCP\u304c\u4e00\u5ea6\u306b\u9001\u4fe1\u3067\u304d\u308b\u30c7\u30fc\u30bf\u90e8\u5206\u306e\u6700\u5927\u5024\u3002\u901a\u5e38\u306f <code>MSS = MTU - IP\u30d8\u30c3\u30c0(20B) - TCP\u30d8\u30c3\u30c0(20B)<\/code> \u2192 <strong>1460\u30d0\u30a4\u30c8<\/strong>\u3002<\/li>\n<\/ul>\n<h3>4. \u30d5\u30e9\u30b0\u30e1\u30f3\u30c8\u51e6\u7406<\/h3>\n<p>\u3082\u3057IP\u30d1\u30b1\u30c3\u30c8\u304cMTU\u3092\u8d85\u3048\u308b\u5834\u5408\u3001IP\u5c64\u3067\u30d1\u30b1\u30c3\u30c8\u3092\u5206\u5272\uff08\u30d5\u30e9\u30b0\u30e1\u30f3\u30c8\u5316\uff09\u3057\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u30d5\u30e9\u30b0\u30e1\u30f3\u30c8\u306f\u518d\u9001\u6642\u306e\u8ca0\u8377\u304c\u5927\u304d\u304f\u306a\u308b\u305f\u3081\u3001TCP\u306fMSS\u3092\u4f7f\u3063\u3066\u4e8b\u524d\u306b\u5206\u5272\u3057\u3066\u9001\u4fe1\u3057\u307e\u3059\u3002<\/p>\n<h3>5. \u5b9f\u52d9\u4e0a\u306e\u30dd\u30a4\u30f3\u30c8<\/h3>\n<ul>\n<li>VPN\u3084IPv6\u3067\u306fMTU\u304c\u7570\u306a\u308b\u305f\u3081\u3001MSS\u8abf\u6574\u304c\u5fc5\u8981\u306b\u306a\u308b\u30b1\u30fc\u30b9\u304c\u3042\u308b\u3002<\/li>\n<li>\u30d5\u30e9\u30b0\u30e1\u30f3\u30c8\u3092\u907f\u3051\u308b\u3053\u3068\u3067\u518d\u9001\u8ca0\u8377\u3084\u9045\u5ef6\u3092\u8efd\u6e1b\u3067\u304d\u308b\u3002<\/li>\n<\/ul>\n<hr>\n<h2>\u901a\u4fe1\u969c\u5bb3\u6642\u306e\u518d\u9001\u51e6\u7406\u6761\u4ef6\u2502TCP\u306e\u4fe1\u983c\u6027\u3092\u652f\u3048\u308b\u4ed5\u7d44\u307f<\/h2>\n<p>TCP\u306f\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u901a\u4fe1\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u3001\u30d1\u30b1\u30c3\u30c8\u304c\u5931\u308f\u308c\u305f\u308a\u9045\u5ef6\u3057\u305f\u5834\u5408\u306b\u518d\u9001\u51e6\u7406\u3092\u884c\u3044\u307e\u3059\u3002\u518d\u9001\u304c\u767a\u52d5\u3059\u308b\u6761\u4ef6\u3084\u4ed5\u7d44\u307f\u3092\u7406\u89e3\u3057\u3066\u304a\u304f\u3053\u3068\u306f\u3001\u8a66\u9a13\u5bfe\u7b56\u3060\u3051\u3067\u306a\u304f\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306b\u3082\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<h3>1. \u518d\u9001\u304c\u884c\u308f\u308c\u308b\u4e3b\u306a\u6761\u4ef6<\/h3>\n<ol>\n<li><strong>ACK\u304c\u4e00\u5b9a\u6642\u9593\u5185\u306b\u8fd4\u3063\u3066\u3053\u306a\u3044\u5834\u5408\uff08\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u518d\u9001\uff09<\/strong>\n<ul>\n<li>TCP\u306f\u9001\u4fe1\u3057\u305f\u30bb\u30b0\u30e1\u30f3\u30c8\u306b\u5bfe\u3057\u3066ACK\uff08\u78ba\u8a8d\u5fdc\u7b54\uff09\u304c\u8fd4\u308b\u306e\u3092\u5f85\u3061\u307e\u3059\u3002<\/li>\n<li>\u8a2d\u5b9a\u3055\u308c\u305f\u6642\u9593\uff08RTO: Retransmission Timeout\uff09\u3092\u904e\u304e\u3066\u3082ACK\u304c\u6765\u306a\u3044\u5834\u5408\u3001\u540c\u3058\u30c7\u30fc\u30bf\u3092\u518d\u9001\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u540c\u3058ACK\u304c\u9023\u7d9a\u3057\u3066\u5c4a\u3044\u305f\u5834\u5408\uff08\u9ad8\u901f\u518d\u9001\uff09<\/strong>\n<ul>\n<li>\u53d7\u4fe1\u5074\u306f\u9806\u5e8f\u901a\u308a\u306e\u30bb\u30b0\u30e1\u30f3\u30c8\u3092\u53d7\u3051\u53d6\u308c\u306a\u304b\u3063\u305f\u5834\u5408\u3001\u6700\u5f8c\u306b\u6b63\u5e38\u306b\u53d7\u4fe1\u3057\u305f\u756a\u53f7\u306eACK\u3092\u7e70\u308a\u8fd4\u3057\u9001\u4fe1\u3057\u307e\u3059\u3002<\/li>\n<li>\u9001\u4fe1\u5074\u306f\u540c\u4e00ACK\u30923\u56de\u9023\u7d9a\u3067\u53d7\u3051\u53d6\u308b\u3068\u3001\u30d1\u30b1\u30c3\u30c8\u6b20\u843d\u3092\u691c\u77e5\u3057\u3066\u5373\u5ea7\u306b\u518d\u9001\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3>2. \u518d\u9001\u5236\u5fa1\u306e\u5de5\u592b<\/h3>\n<ul>\n<li><strong>\u6307\u6570\u30d0\u30c3\u30af\u30aa\u30d5<\/strong>\uff1a\u518d\u9001\u304c\u7e70\u308a\u8fd4\u3055\u308c\u308b\u305f\u3073\u306b\u5f85\u6a5f\u6642\u9593\u3092\u500d\u5897\u3055\u305b\u3001\u6df7\u96d1\u72b6\u614b\u306e\u60aa\u5316\u3092\u9632\u3050\u3002<\/li>\n<li><strong>\u8f3b\u8f33\u5236\u5fa1\u3068\u306e\u9023\u643a<\/strong>\uff1a\u518d\u9001\u767a\u751f\u6642\u306b\u306f\u30a6\u30a3\u30f3\u30c9\u30a6\u30b5\u30a4\u30ba\u3092\u7e2e\u5c0f\u3057\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8ca0\u8377\u3092\u8efd\u6e1b\u3059\u308b\u3002<\/li>\n<\/ul>\n<h3>3. \u8eab\u8fd1\u306a\u4f8b\u3048<\/h3>\n<ul>\n<li><strong>\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u518d\u9001<\/strong>\uff1a\u53cb\u9054\u306bLINE\u3092\u9001\u3063\u305f\u304c\u65e2\u8aad\u304c\u3064\u304b\u306a\u3044\u306e\u3067\u3001\u6642\u9593\u3092\u304a\u3044\u3066\u3082\u3046\u4e00\u5ea6\u9001\u308b\u3002<\/li>\n<li><strong>\u9ad8\u901f\u518d\u9001<\/strong>\uff1a\u53cb\u9054\u304b\u3089\u300c\u524d\u306e\u8a71\u805e\u3053\u3048\u306a\u304b\u3063\u305f\u300d\u30683\u56de\u9023\u7d9a\u3067\u8a00\u308f\u308c\u305f\u3089\u3001\u3059\u3050\u306b\u8a00\u3044\u76f4\u3059\u3002<\/li>\n<\/ul>\n<h2>TCP\u30fbUDP\u30d8\u30c3\u30c0\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u2502\u5404\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5f79\u5272\u3068\u8a66\u9a13\u983b\u51fa\u30dd\u30a4\u30f3\u30c8<\/h2>\n<p>\u30c8\u30e9\u30f3\u30b9\u30dd\u30fc\u30c8\u5c64\u306e\u30d8\u30c3\u30c0\u306f\u3001\u9001\u4fe1\u5143\u3068\u5b9b\u5148\u3092\u8b58\u5225\u3057\u305f\u308a\u3001\u901a\u4fe1\u5236\u5fa1\u3092\u884c\u3046\u305f\u3081\u306e\u91cd\u8981\u306a\u60c5\u5831\u3092\u542b\u307f\u307e\u3059\u3002TCP\u3068UDP\u3067\u306f\u30d8\u30c3\u30c0\u306e\u69cb\u9020\u3084\u30b5\u30a4\u30ba\u304c\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>1. TCP\u30d8\u30c3\u30c0\uff0820\u30d0\u30a4\u30c8\u4ee5\u4e0a\uff09<\/h3>\n<p>TCP\u30d8\u30c3\u30c0\u306f\u53ef\u5909\u9577\u3067\u3001\u57fa\u672c\u7684\u306a\u69cb\u6210\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u30d5\u30a3\u30fc\u30eb\u30c9\u540d<\/th>\n<th>\u30b5\u30a4\u30ba<\/th>\n<th>\u5f79\u5272<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u756a\u53f7<\/td>\n<td>16\u30d3\u30c3\u30c8<\/td>\n<td>\u9001\u4fe1\u5143\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u8b58\u5225<\/td>\n<\/tr>\n<tr>\n<td>\u5b9b\u5148\u30dd\u30fc\u30c8\u756a\u53f7<\/td>\n<td>16\u30d3\u30c3\u30c8<\/td>\n<td>\u5b9b\u5148\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u8b58\u5225<\/td>\n<\/tr>\n<tr>\n<td>\u30b7\u30fc\u30b1\u30f3\u30b9\u756a\u53f7<\/td>\n<td>32\u30d3\u30c3\u30c8<\/td>\n<td>\u30c7\u30fc\u30bf\u306e\u9806\u5e8f\u3092\u7ba1\u7406<\/td>\n<\/tr>\n<tr>\n<td>\u78ba\u8a8d\u5fdc\u7b54\u756a\u53f7\uff08ACK\u756a\u53f7\uff09<\/td>\n<td>32\u30d3\u30c3\u30c8<\/td>\n<td>\u6b21\u306b\u53d7\u4fe1\u3092\u671f\u5f85\u3059\u308b\u30c7\u30fc\u30bf\u306e\u756a\u53f7<\/td>\n<\/tr>\n<tr>\n<td>\u30c7\u30fc\u30bf\u30aa\u30d5\u30bb\u30c3\u30c8<\/td>\n<td>4\u30d3\u30c3\u30c8<\/td>\n<td>\u30d8\u30c3\u30c0\u9577\uff08\u5358\u4f4d\uff1a32\u30d3\u30c3\u30c8\uff09<\/td>\n<\/tr>\n<tr>\n<td>\u5236\u5fa1\u30d3\u30c3\u30c8\uff08\u30d5\u30e9\u30b0\uff09<\/td>\n<td>6\u30d3\u30c3\u30c8\uff08+\u4e88\u7d04\uff09<\/td>\n<td>SYN\/ACK\/FIN\/RST\/PSH\/URG\u7b49\u306e\u5236\u5fa1<\/td>\n<\/tr>\n<tr>\n<td>\u30a6\u30a3\u30f3\u30c9\u30a6\u30b5\u30a4\u30ba<\/td>\n<td>16\u30d3\u30c3\u30c8<\/td>\n<td>\u30d5\u30ed\u30fc\u5236\u5fa1\u306e\u305f\u3081\u306e\u53d7\u4fe1\u53ef\u80fd\u30c7\u30fc\u30bf\u91cf<\/td>\n<\/tr>\n<tr>\n<td>\u30c1\u30a7\u30c3\u30af\u30b5\u30e0<\/td>\n<td>16\u30d3\u30c3\u30c8<\/td>\n<td>\u30d8\u30c3\u30c0\uff0b\u30c7\u30fc\u30bf\u306e\u8aa4\u308a\u691c\u51fa<\/td>\n<\/tr>\n<tr>\n<td>\u7dca\u6025\u30dd\u30a4\u30f3\u30bf<\/td>\n<td>16\u30d3\u30c3\u30c8<\/td>\n<td>URG\u30d5\u30e9\u30b0\u4f7f\u7528\u6642\u306e\u7dca\u6025\u30c7\u30fc\u30bf\u4f4d\u7f6e<\/td>\n<\/tr>\n<tr>\n<td>\u30aa\u30d7\u30b7\u30e7\u30f3<\/td>\n<td>\u53ef\u5909\u9577<\/td>\n<td>MSS\u6307\u5b9a\u306a\u3069\u306e\u62e1\u5f35\u60c5\u5831<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>2. UDP\u30d8\u30c3\u30c0\uff08\u56fa\u5b9a8\u30d0\u30a4\u30c8\uff09<\/h3>\n<p>UDP\u306f\u30b7\u30f3\u30d7\u30eb\u3067\u56fa\u5b9a\u9577\u3067\u3059\u3002<\/p>\n<table>\n<thead>\n<tr>\n<th>\u30d5\u30a3\u30fc\u30eb\u30c9\u540d<\/th>\n<th>\u30b5\u30a4\u30ba<\/th>\n<th>\u5f79\u5272<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u9001\u4fe1\u5143\u30dd\u30fc\u30c8\u756a\u53f7<\/td>\n<td>16\u30d3\u30c3\u30c8<\/td>\n<td>\u9001\u4fe1\u5143\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u8b58\u5225<\/td>\n<\/tr>\n<tr>\n<td>\u5b9b\u5148\u30dd\u30fc\u30c8\u756a\u53f7<\/td>\n<td>16\u30d3\u30c3\u30c8<\/td>\n<td>\u5b9b\u5148\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u8b58\u5225<\/td>\n<\/tr>\n<tr>\n<td>\u30c7\u30fc\u30bf\u9577<\/td>\n<td>16\u30d3\u30c3\u30c8<\/td>\n<td>\u30d8\u30c3\u30c0\uff0b\u30c7\u30fc\u30bf\u5168\u4f53\u306e\u9577\u3055<\/td>\n<\/tr>\n<tr>\n<td>\u30c1\u30a7\u30c3\u30af\u30b5\u30e0<\/td>\n<td>16\u30d3\u30c3\u30c8<\/td>\n<td>\u30d8\u30c3\u30c0\uff0b\u30c7\u30fc\u30bf\u306e\u8aa4\u308a\u691c\u51fa<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>3. \u56f3\u89e3\u30a4\u30e1\u30fc\u30b8\uff08\u8a66\u9a13\u5bfe\u7b56\uff09<\/h3>\n<ul>\n<li>TCP\u30d8\u30c3\u30c0\uff1a\u5b85\u914d\u4fbf\u306e\u4f1d\u7968\u306b\u300c\u9001\u4fe1\u5143\u4f4f\u6240\u300d\u300c\u5b9b\u5148\u4f4f\u6240\u300d\u300c\u8ffd\u8de1\u756a\u53f7\u300d\u300c\u53d7\u53d6\u30b5\u30a4\u30f3\u6b04\u300d\u300c\u914d\u9001\u6761\u4ef6\u300d\u306a\u3069\u304c\u8a73\u7d30\u306b\u8a18\u8f09\u3055\u308c\u3066\u3044\u308b\u30a4\u30e1\u30fc\u30b8\u3002<\/li>\n<li>UDP\u30d8\u30c3\u30c0\uff1a\u30dd\u30b9\u30c8\u30ab\u30fc\u30c9\u306b\u300c\u9001\u308a\u5148\u4f4f\u6240\u300d\u300c\u9001\u308a\u4e3b\u4f4f\u6240\u300d\u3060\u3051\u66f8\u3044\u3066\u3042\u308b\u30a4\u30e1\u30fc\u30b8\u3002<\/li>\n<\/ul>\n<hr>\n<h2>UDP\u3068\u95a2\u4fc2\u306e\u6df1\u3044\u30d7\u30ed\u30c8\u30b3\u30eb\u2502\u8efd\u91cf\u6027\u3092\u6d3b\u304b\u3059\u4ee3\u8868\u4f8b<\/h2>\n<p>UDP\u306f\u30b7\u30f3\u30d7\u30eb\u3067\u9ad8\u901f\u306a\u7279\u6027\u3092\u6d3b\u304b\u3057\u3001\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u6027\u3084\u4f4e\u9045\u5ef6\u304c\u6c42\u3081\u3089\u308c\u308b\u901a\u4fe1\u3067\u3088\u304f\u5229\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001UDP\u3068\u5bc6\u63a5\u306b\u95a2\u4fc2\u3059\u308b\u4ee3\u8868\u7684\u306a\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h3>1. DNS\uff08Domain Name System\uff09<\/h3>\n<ul>\n<li><strong>\u5f79\u5272<\/strong>\uff1a\u30c9\u30e1\u30a4\u30f3\u540d\u3068IP\u30a2\u30c9\u30ec\u30b9\u306e\u76f8\u4e92\u5909\u63db\uff08\u540d\u524d\u89e3\u6c7a\uff09<\/li>\n<li><strong>\u7279\u5fb4<\/strong>\uff1a1\u56de\u306e\u554f\u3044\u5408\u308f\u305b\u3068\u5fdc\u7b54\u304c\u5c0f\u3055\u304f\u9ad8\u901f\u306a\u305f\u3081\u3001UDP\u3092\u4f7f\u7528\uff08\u30dd\u30fc\u30c853\uff09\u3002<\/li>\n<li><strong>\u88dc\u8db3<\/strong>\uff1a\u5927\u304d\u306a\u5fdc\u7b54\u3084\u30be\u30fc\u30f3\u8ee2\u9001\u6642\u306fTCP\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3082\u3042\u308b\u3002<\/li>\n<\/ul>\n<h3>2. DHCP\uff08Dynamic Host Configuration Protocol\uff09<\/h3>\n<ul>\n<li><strong>\u5f79\u5272<\/strong>\uff1aIP\u30a2\u30c9\u30ec\u30b9\u3084\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3001DNS\u30b5\u30fc\u30d0\u306a\u3069\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a2d\u5b9a\u3092\u81ea\u52d5\u914d\u5e03<\/li>\n<li><strong>\u7279\u5fb4<\/strong>\uff1a\u521d\u671f\u63a5\u7d9a\u6642\u306b\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u3067\u3084\u308a\u53d6\u308a\u3059\u308b\u305f\u3081\u3001UDP\uff08\u30dd\u30fc\u30c867\/68\uff09\u3092\u5229\u7528\u3002<\/li>\n<\/ul>\n<h3>3. SNMP\uff08Simple Network Management Protocol\uff09<\/h3>\n<ul>\n<li><strong>\u5f79\u5272<\/strong>\uff1a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6a5f\u5668\u306e\u76e3\u8996\u30fb\u7ba1\u7406<\/li>\n<li><strong>\u7279\u5fb4<\/strong>\uff1a\u8efd\u91cf\u3067\u3001\u76e3\u8996\u30c7\u30fc\u30bf\u306e\u3084\u308a\u53d6\u308a\u306bUDP\uff08\u30dd\u30fc\u30c8161\uff09\u3092\u5229\u7528\u3002<\/li>\n<\/ul>\n<h3>4. TFTP\uff08Trivial File Transfer Protocol\uff09<\/h3>\n<ul>\n<li><strong>\u5f79\u5272<\/strong>\uff1a\u7c21\u6613\u30d5\u30a1\u30a4\u30eb\u8ee2\u9001<\/li>\n<li><strong>\u7279\u5fb4<\/strong>\uff1a\u8a8d\u8a3c\u3084\u8907\u96d1\u306a\u5236\u5fa1\u3092\u6301\u305f\u305a\u3001UDP\uff08\u30dd\u30fc\u30c869\uff09\u3067\u52d5\u4f5c\u3002\u4e3b\u306b\u6a5f\u5668\u306e\u8a2d\u5b9a\u914d\u5e03\u3084\u30d5\u30a1\u30fc\u30e0\u30a6\u30a7\u30a2\u66f4\u65b0\u306b\u5229\u7528\u3002<\/li>\n<\/ul>\n<h3>5. RTP\uff08Real-time Transport Protocol\uff09<\/h3>\n<ul>\n<li><strong>\u5f79\u5272<\/strong>\uff1a\u97f3\u58f0\u30fb\u52d5\u753b\u306a\u3069\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u30c7\u30fc\u30bf\u306e\u9001\u53d7\u4fe1<\/li>\n<li><strong>\u7279\u5fb4<\/strong>\uff1aVoIP\u3084\u6620\u50cf\u914d\u4fe1\u3067UDP\u3092\u5229\u7528\u3057\u3001\u9045\u5ef6\u3088\u308a\u3082\u30b9\u30e0\u30fc\u30ba\u306a\u518d\u751f\u3092\u512a\u5148\u3002<\/li>\n<\/ul>\n<h3>\u8eab\u8fd1\u306a\u4f8b\u3048<\/h3>\n<p>UDP\u306f\u300c\u901f\u3055\u91cd\u8996\u306e\u30d0\u30a4\u30af\u4fbf\u300d\u306e\u3088\u3046\u306a\u5b58\u5728\u3067\u3059\u3002\u591a\u5c11\u306e\u8377\u7269\u843d\u4e0b\uff08\u30c7\u30fc\u30bf\u6b20\u640d\uff09\u3088\u308a\u3082\u3001\u3068\u306b\u304b\u304f\u65e9\u304f\u5c4a\u3051\u308b\u3053\u3068\u3092\u512a\u5148\u3057\u307e\u3059\u3002DNS\u3084VoIP\u306a\u3069\u3001\u30b9\u30d4\u30fc\u30c9\u304c\u547d\u306e\u30b5\u30fc\u30d3\u30b9\u306b\u3074\u3063\u305f\u308a\u3067\u3059\u3002<\/p>\n<li>UDP\u30d8\u30c3\u30c0\uff1a\u30dd\u30b9\u30c8\u30ab\u30fc\u30c9\u306b\u300c\u9001\u308a\u5148\u4f4f\u6240\u300d\u300c\u9001\u308a\u4e3b\u4f4f\u6240\u300d\u3060\u3051\u66f8\u3044\u3066\u3042\u308b\u30a4\u30e1\u30fc\u30b8\u3002<\/li>\n<\/ul>\n<hr>\n<h2>UDP\u3068\u95a2\u4fc2\u306e\u6df1\u3044\u30d7\u30ed\u30c8\u30b3\u30eb\u2502\u8efd\u91cf\u6027\u3092\u6d3b\u304b\u3059\u4ee3\u8868\u4f8b<\/h2>\n<p>UDP\u306f\u30b7\u30f3\u30d7\u30eb\u3067\u9ad8\u901f\u306a\u7279\u6027\u3092\u6d3b\u304b\u3057\u3001\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u6027\u3084\u4f4e\u9045\u5ef6\u304c\u6c42\u3081\u3089\u308c\u308b\u901a\u4fe1\u3067\u3088\u304f\u5229\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001UDP\u3068\u5bc6\u63a5\u306b\u95a2\u4fc2\u3059\u308b\u4ee3\u8868\u7684\u306a\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h3>1. DNS\uff08Domain Name System\uff09<\/h3>\n<ul>\n<li><strong>\u5f79\u5272<\/strong>\uff1a\u30c9\u30e1\u30a4\u30f3\u540d\u3068IP\u30a2\u30c9\u30ec\u30b9\u306e\u76f8\u4e92\u5909\u63db\uff08\u540d\u524d\u89e3\u6c7a\uff09<\/li>\n<li><strong>\u7279\u5fb4<\/strong>\uff1a1\u56de\u306e\u554f\u3044\u5408\u308f\u305b\u3068\u5fdc\u7b54\u304c\u5c0f\u3055\u304f\u9ad8\u901f\u306a\u305f\u3081\u3001UDP\u3092\u4f7f\u7528\uff08\u30dd\u30fc\u30c853\uff09\u3002<\/li>\n<li><strong>\u88dc\u8db3<\/strong>\uff1a\u5927\u304d\u306a\u5fdc\u7b54\u3084\u30be\u30fc\u30f3\u8ee2\u9001\u6642\u306fTCP\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3082\u3042\u308b\u3002<\/li>\n<\/ul>\n<h3>2. DHCP\uff08Dynamic Host Configuration Protocol\uff09<\/h3>\n<ul>\n<li><strong>\u5f79\u5272<\/strong>\uff1aIP\u30a2\u30c9\u30ec\u30b9\u3084\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3001DNS\u30b5\u30fc\u30d0\u306a\u3069\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a2d\u5b9a\u3092\u81ea\u52d5\u914d\u5e03<\/li>\n<li><strong>\u7279\u5fb4<\/strong>\uff1a\u521d\u671f\u63a5\u7d9a\u6642\u306b\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u3067\u3084\u308a\u53d6\u308a\u3059\u308b\u305f\u3081\u3001UDP\uff08\u30dd\u30fc\u30c867\/68\uff09\u3092\u5229\u7528\u3002<\/li>\n<\/ul>\n<h3>3. SNMP\uff08Simple Network Management Protocol\uff09<\/h3>\n<ul>\n<li><strong>\u5f79\u5272<\/strong>\uff1a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u6a5f\u5668\u306e\u76e3\u8996\u30fb\u7ba1\u7406<\/li>\n<li><strong>\u7279\u5fb4<\/strong>\uff1a\u8efd\u91cf\u3067\u3001\u76e3\u8996\u30c7\u30fc\u30bf\u306e\u3084\u308a\u53d6\u308a\u306bUDP\uff08\u30dd\u30fc\u30c8161\uff09\u3092\u5229\u7528\u3002<\/li>\n<\/ul>\n<h3>4. TFTP\uff08Trivial File Transfer Protocol\uff09<\/h3>\n<ul>\n<li><strong>\u5f79\u5272<\/strong>\uff1a\u7c21\u6613\u30d5\u30a1\u30a4\u30eb\u8ee2\u9001<\/li>\n<li><strong>\u7279\u5fb4<\/strong>\uff1a\u8a8d\u8a3c\u3084\u8907\u96d1\u306a\u5236\u5fa1\u3092\u6301\u305f\u305a\u3001UDP\uff08\u30dd\u30fc\u30c869\uff09\u3067\u52d5\u4f5c\u3002\u4e3b\u306b\u6a5f\u5668\u306e\u8a2d\u5b9a\u914d\u5e03\u3084\u30d5\u30a1\u30fc\u30e0\u30a6\u30a7\u30a2\u66f4\u65b0\u306b\u5229\u7528\u3002<\/li>\n<\/ul>\n<h3>5. RTP\uff08Real-time Transport Protocol\uff09<\/h3>\n<ul>\n<li><strong>\u5f79\u5272<\/strong>\uff1a\u97f3\u58f0\u30fb\u52d5\u753b\u306a\u3069\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u30c7\u30fc\u30bf\u306e\u9001\u53d7\u4fe1<\/li>\n<li><strong>\u7279\u5fb4<\/strong>\uff1aVoIP\u3084\u6620\u50cf\u914d\u4fe1\u3067UDP\u3092\u5229\u7528\u3057\u3001\u9045\u5ef6\u3088\u308a\u3082\u30b9\u30e0\u30fc\u30ba\u306a\u518d\u751f\u3092\u512a\u5148\u3002<\/li>\n<\/ul>\n<h3>\u8eab\u8fd1\u306a\u4f8b\u3048<\/h3>\n<p>UDP\u306f\u300c\u901f\u3055\u91cd\u8996\u306e\u30d0\u30a4\u30af\u4fbf\u300d\u306e\u3088\u3046\u306a\u5b58\u5728\u3067\u3059\u3002\u591a\u5c11\u306e\u8377\u7269\u843d\u4e0b\uff08\u30c7\u30fc\u30bf\u6b20\u640d\uff09\u3088\u308a\u3082\u3001\u3068\u306b\u304b\u304f\u65e9\u304f\u5c4a\u3051\u308b\u3053\u3068\u3092\u512a\u5148\u3057\u307e\u3059\u3002DNS\u3084VoIP\u306a\u3069\u3001\u30b9\u30d4\u30fc\u30c9\u304c\u547d\u306e\u30b5\u30fc\u30d3\u30b9\u306b\u3074\u3063\u305f\u308a\u3067\u3059\u3002<\/p>\n<hr>\n<h2>\u30b9\u30e9\u30a4\u30c7\u30a3\u30f3\u30b0\u30a6\u30a3\u30f3\u30c9\u30a6\u3068\u30d5\u30ed\u30fc\u5236\u5fa1\u2502\u8f3b\u8f33\u5236\u5fa1\u3068\u306e\u9055\u3044\u3082\u6574\u7406<\/h2>\n<p>TCP\u901a\u4fe1\u3067\u306f\u3001\u9001\u4fe1\u5074\u3068\u53d7\u4fe1\u5074\u306e\u9593\u3067\u30c7\u30fc\u30bf\u306e\u6d41\u308c\u3092\u52b9\u7387\u7684\u304b\u3064\u5b89\u5168\u306b\u5236\u5fa1\u3059\u308b\u4ed5\u7d44\u307f\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u4ee3\u8868\u4f8b\u304c<strong>\u30b9\u30e9\u30a4\u30c7\u30a3\u30f3\u30b0\u30a6\u30a3\u30f3\u30c9\u30a6<\/strong>\u3068<strong>\u30d5\u30ed\u30fc\u5236\u5fa1<\/strong>\u3067\u3059\u3002<\/p>\n<h3>1. \u30d5\u30ed\u30fc\u5236\u5fa1\u3068\u306f<\/h3>\n<ul>\n<li><strong>\u76ee\u7684<\/strong>\uff1a\u53d7\u4fe1\u5074\u306e\u51e6\u7406\u80fd\u529b\u3092\u8d85\u3048\u308b\u30c7\u30fc\u30bf\u3092\u9001\u3089\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3002<\/li>\n<li><strong>\u4ed5\u7d44\u307f<\/strong>\uff1a\u53d7\u4fe1\u5074\u304cTCP\u30d8\u30c3\u30c0\u306e\u300c\u30a6\u30a3\u30f3\u30c9\u30a6\u30b5\u30a4\u30ba\u300d\u3067\u53d7\u4fe1\u53ef\u80fd\u306a\u30d0\u30a4\u30c8\u6570\u3092\u901a\u77e5\u3057\u3001\u9001\u4fe1\u5074\u306f\u305d\u306e\u7bc4\u56f2\u5185\u3067\u9001\u4fe1\u3002<\/li>\n<li><strong>\u4f8b\u3048<\/strong>\uff1a\u98f2\u98df\u5e97\u3067\u3001\u30ad\u30c3\u30c1\u30f3\u304c\u300c\u4eca\u306f10\u98df\u307e\u3067\u4f5c\u308c\u308b\u300d\u3068\u6ce8\u6587\u53d7\u4ed8\u306b\u4f1d\u3048\u308b\u30a4\u30e1\u30fc\u30b8\u3002<\/li>\n<\/ul>\n<h3>2. \u30b9\u30e9\u30a4\u30c7\u30a3\u30f3\u30b0\u30a6\u30a3\u30f3\u30c9\u30a6\u65b9\u5f0f<\/h3>\n<ul>\n<li><strong>\u6982\u8981<\/strong>\uff1a\u8907\u6570\u306e\u30bb\u30b0\u30e1\u30f3\u30c8\u3092\u9023\u7d9a\u9001\u4fe1\u3057\u3001ACK\u306b\u5408\u308f\u305b\u3066\u9001\u4fe1\u53ef\u80fd\u7bc4\u56f2\uff08\u30a6\u30a3\u30f3\u30c9\u30a6\uff09\u3092\u524d\u65b9\u3078\u6ed1\u3089\u305b\u308b\u3002<\/li>\n<li><strong>\u30e1\u30ea\u30c3\u30c8<\/strong>\uff1a\u5f85\u3061\u6642\u9593\u3092\u524a\u6e1b\u3057\u3001\u56de\u7dda\u5229\u7528\u52b9\u7387\u3092\u5411\u4e0a\u3002<\/li>\n<li><strong>\u4f8b\u3048<\/strong>\uff1a\u56de\u8ee2\u5bff\u53f8\u306e\u30ec\u30fc\u30f3\u306b\u8907\u6570\u76bf\u3092\u6d41\u3057\u3001\u5ba2\u304c\u53d6\u3063\u305f\u3089\u65b0\u3057\u3044\u76bf\u3092\u6d41\u3059\u3002<\/li>\n<\/ul>\n<h3>3. 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