{"id":178,"date":"2022-01-06T18:07:00","date_gmt":"2022-01-06T10:07:00","guid":{"rendered":"https:\/\/www.hoongdou.com\/?p=178"},"modified":"2024-08-26T21:55:24","modified_gmt":"2024-08-26T13:55:24","slug":"ipv4-a%e3%80%81b%e3%80%81c%e7%b1%bb%e7%bd%91%e7%bb%9c","status":"publish","type":"post","link":"https:\/\/www.hoongdou.com\/index.php\/2022\/01\/06\/ipv4-a%e3%80%81b%e3%80%81c%e7%b1%bb%e7%bd%91%e7%bb%9c\/","title":{"rendered":"IPV4\u2014\u2014A\u3001B\u3001C\u7c7b\u7f51\u7edc"},"content":{"rendered":"\n<div class=\"has-toc have-toc\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">\u6982\u8ff0<\/h2>\n\n\n\n<p>\u8fd9\u51e0\u5929\u590d\u4e60\u7b80\u5355\u7684ABC\u7c7b\u7f51\u7edc\u7684\u65f6\u5019\u53d1\u73b0\u767e\u5ea6\u767e\u79d1\u4e0a\u9762\u5199\u7684\u6709\u70b9\u95ee\u9898\u2026\u2026\u91cd\u65b0\u7ffb\u4e86\u4e00\u4e0b\u4e66\u548c\u8d44\u6599\u6574\u7406\u4e86\u4e00\u4e0b\u3002<\/p>\n\n\n\n<p>\u629b\u5f00IPV6\u4e0d\u8c08\uff0cIPV4\u7684\u4e92\u8054\u7f51\u5730\u5740\u662f\u7531\u7ba1\u7406\u4e92\u8054\u7f51\u7684\u7ec4\u7ec7\u2014\u2014InterNIC\uff08http:\/\/www.internic.net \uff09\u5206\u914d\u7684\u3002\u8fd9\u4e9bIP\u5730\u5740\u88ab\u5212\u5206\u4e3a\u4e0d\u540c\u7684\u7b49\u7ea7\u3002\u5176\u4e2d\u6700\u5e38\u89c1\u7684\u662fA\u3001B\u548cC\u7c7b\u3002D\u548cE\u7c7b\u4e5f\u5b58\u5728\uff0c\u4f46\u4e00\u822c\u4e0d\u88ab\u6700\u7ec8\u7528\u6237\u4f7f\u7528\u3002\u6bcf\u4e2a\u5730\u5740\u7c7b\u522b\u90fd\u6709\u4e00\u4e2a\u4e0d\u540c\u7684\u9ed8\u8ba4\u5b50\u7f51\u63a9\u7801\u3002<\/p>\n\n\n\n<p>\u4f60\u53ef\u4ee5\u901a\u8fc7\u67e5\u770b\u4e00\u4e2aIP\u5730\u5740\u7684\u63a9\u7801\u4e8c\u8fdb\u5236\u4e2d\u7b2c\u4e00\u4e2a\u516b\u4f4d\u6807\u8bc6\u957f\u5ea6\u6765\u786e\u5b9a\u5b83\u7684\u7c7b\u522b\u3002\u4ee5\u4e0b\u662fA\u7c7b\u3001B\u7c7b\u548cC\u7c7b\u4e92\u8054\u7f51\u5730\u5740\u7684\u8303\u56f4\uff0c\u6bcf\u4e2a\u5730\u5740\u90fd\u6709\u4e00\u4e2a\u4f8b\u5b50\u3002<\/p>\n\n\n\n<p>A \u7c7b\u7f51\u7edc\u4f7f\u7528\u9ed8\u8ba4\u5b50\u7f51\u63a9\u7801 255.0.0.0\uff0c\u5e76\u5c06 0-127 \u4f5c\u4e3a\u5b83\u4eec\u7684\u7b2c\u4e00\u4e2a\u516b\u4f4d\u5b57\u8282\u3002 \u5730\u5740 10.52.36.11 \u662f A \u7c7b\u5730\u5740\u3002 \u5b83\u7684\u7b2c\u4e00\u4e2a\u516b\u4f4d\u5b57\u8282\u662f 10\uff0c\u5b83\u4ecb\u4e8e 1 \u548c 126 \u4e4b\u95f4\uff0c\u5305\u62ec 1 \u548c 126\u3002<\/p>\n\n\n\n<p>B \u7c7b\u7f51\u7edc\u4f7f\u7528\u9ed8\u8ba4\u5b50\u7f51\u63a9\u7801 255.255.0.0\uff0c\u5e76\u5c06 128-191 \u4f5c\u4e3a\u5b83\u4eec\u7684\u7b2c\u4e00\u4e2a\u516b\u4f4d\u5b57\u8282\u3002 \u5730\u5740 172.16.52.63 \u662f B \u7c7b\u5730\u5740\u3002 \u5b83\u7684\u7b2c\u4e00\u4e2a\u516b\u4f4d\u5b57\u8282\u662f 172\uff0c\u4ecb\u4e8e 128 \u548c 191 \u4e4b\u95f4\uff0c\u5305\u62ec 172\u3002<\/p>\n\n\n\n<p>C \u7c7b\u7f51\u7edc\u4f7f\u7528\u9ed8\u8ba4\u5b50\u7f51\u63a9\u7801 255.255.255.0\uff0c\u5e76\u5c06 192-223 \u4f5c\u4e3a\u5b83\u4eec\u7684\u7b2c\u4e00\u4e2a\u516b\u4f4d\u5b57\u8282\u3002 \u5730\u5740 192.168.123.132 \u662f C \u7c7b\u5730\u5740\u3002 \u5b83\u7684\u7b2c\u4e00\u4e2a\u516b\u4f4d\u5b57\u8282\u662f 192\uff0c\u4ecb\u4e8e 192 \u548c 223 \u4e4b\u95f4\uff0c\u5305\u62ec 192 \u548c 223\u3002<\/p>\n\n\n\n<p>\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u9ed8\u8ba4\u5b50\u7f51\u63a9\u7801\u503c\u4e0d\u9002\u5408\u5de5\u4f5c\u9700\u8981\uff0c\u56e0\u4e3a\u7f51\u7edc\u7684\u7269\u7406\u62d3\u6251\uff0c\u6216\u8005\u56e0\u4e3a\u7f51\u7edc\uff08\u6216\u4e3b\u673a\uff09\u7684\u6570\u91cf\u4e0d\u9002\u5408\u9ed8\u8ba4\u5b50\u7f51\u63a9\u7801\u7684\u9650\u5236\u3002 \u90a3\u5982\u4f55\u4f7f\u7528\u5b50\u7f51\u63a9\u7801\u5212\u5206\u7f51\u7edc\u5462\uff1f<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\"   class=\"lazyload\" data-src=\"https:\/\/www.hoongdou.com\/wp-content\/uploads\/2022\/01\/1683799708-1c1b145184fa9b77294bba9ff6988b9e.png\" src=\"https:\/\/js.hoongdou.com\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\"\/><\/figure >\n<noscript><img decoding=\"async\" src=\"https:\/\/cdn.hoongdou.com\/wp-content\/uploads\/2022\/01\/1683799708-1c1b145184fa9b77294bba9ff6988b9e.png?x-oss-process=image\/resize,w_1280\" alt=\"\"\/><\/figure><\/noscript>\n\n\n\n<h2 class=\"wp-block-heading\">Class A Network (\/ 8 Prefixes)<\/h2>\n\n\n\n<p>A\u7c7b\u7f51\u7edc\u62e5\u6709 8 \u4f4d\u7f51\u7edc\u524d\u7f00\u3002 \u5b83\u7684\u6700\u9ad8\u4f4d\u8bbe\u7f6e\u4e3a 0\uff0c\u5305\u542b\u4e00\u4e2a 7 \u4f4d\u7f51\u7edc\u53f7\u548c\u4e00\u4e2a <strong>24 \u4f4d\u4e3b\u673a\u53f7<\/strong>\u3002<\/p>\n\n\n\n<p>A\u7c7b\u7f51\u7edc\u6700\u591a\u53ef\u5b9a\u4e49<strong> 126 \u4e2a\u7f51\u7edc\u53f7<\/strong>\uff0c\u5373 ( <strong>2&nbsp;<sup>7<\/sup>&nbsp;-2<\/strong> ) \u4e2a\u7f51\u7edc\uff1b \u51cf\u53bb 2 \u662f\u56e0\u4e3a\u5728\u67d0\u4e9b\u4f7f\u7528 RIP-1 \u534f\u8bae\u7684\u8def\u7531\u5668\u4e2d\u4e0d\u80fd\u4f7f\u7528\u6240\u6709\uff080 \u548c 1\uff09\u5b50\u7f51\u3002 \u6bcf\u4e2a\u7f51\u7edc\u6700\u591a\u652f\u6301\u6bcf\u4e2a\u7f51\u7edc 16,777,214 ( 2&nbsp;<sup>24<\/sup>&nbsp;-2 ) \u53f0\u4e3b\u673a\u3002 \u5fc5\u987b\u51cf\u53bb 2\uff0c\u56e0\u4e3a\u57fa\u7840\u7f51\u7edc\u8868\u793a\u4e3b\u673a\u201c0\u201d\uff0c\u800c\u7f51\u7edc\u4e0a\u7684\u6700\u540e\u4e00\u4e2a\u4e3b\u673a\u5b9e\u9645\u4e0a\u662f\u7528\u4e8e 1\uff08\u201c\u5e7f\u64ad\u4f7f\u7528\u201d\uff09\uff0c\u53ef\u80fd\u4e0d\u4f1a\u5206\u914d\u7ed9\u4efb\u4f55\u4e3b\u673a\u3002<\/p>\n\n\n\n<p>A \u7c7b\u7f51\u7edc\u5730\u5740\u5757\u5305\u542b  2&nbsp;<sup>31<\/sup>  (2,147,483,648) \u4e2a\u5355\u72ec\u7684\u5730\u5740\u3002 IPv4 \u5730\u5740\u7a7a\u95f4\u6700\u591a\u5305\u542b  2&nbsp;<sup>32<\/sup>&nbsp;  (4,294,967,296) \u4e2a\u5730\u5740\uff0c\u8fd9\u610f\u5473\u7740 A \u7c7b\u7f51\u7edc\u5730\u5740\u7a7a\u95f4\u5360 IPv4 \u5355\u64ad\u5730\u5740\u7a7a\u95f4\u603b\u6570\u7684 50%\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Class B Networks (\/16 Prefixes)<\/h2>\n\n\n\n<p>This network is a 16-bit network prefix; its highest bit order is set to&nbsp;<strong>1-0<\/strong>. It is a 14-bit network number with a 16-bit host number.<\/p>\n\n\n\n<p>B\u7c7b\u7f51\u7edc\u4e3a 16 \u4f4d\u7684\u7f51\u7edc\u524d\u7f00\uff1b \u5b83\u7684\u6700\u9ad8\u4f4d\u987a\u5e8f\u8bbe\u7f6e\u4e3a 1-0\u3002 \u5b83\u7531\u4e00\u4e2a 14 \u4f4d\u7f51\u7edc\u53f7\u548c\u4e00\u4e2a 16 \u4f4d\u4e3b\u673a\u53f7\u6784\u6210\u3002<\/p>\n\n\n\n<p>This class defines 16,384 (2&nbsp;<sup>14<\/sup>&nbsp;) \/16 networks, and supports a maximum of 65,534 (2&nbsp;<sup>16<\/sup>&nbsp;-2) hosts per network. Class B \/16 block address is (1,073,741,824) = 2&nbsp;<sup>30<\/sup>; therefore it represent 25% of the total IPV4.<\/p>\n\n\n\n<p>B\u7c7b\u7f51\u7edc\u5b9a\u4e49\u4e8616,384 ( 2&nbsp;<sup>14<\/sup> )  \u4e2a\u7f51\u7edc\u53f7\uff0c\u6bcf\u4e2a\u7f51\u7edc\u6700\u591a\u652f\u6301 65,534 ( 2&nbsp;<sup>16<\/sup>&nbsp;-2 ) \u4e2a\u4e3b\u673a\u3002 B\u7c7b\u7f51\u7edc\u5730\u5740\u4e3a(1,073,741,824) =  2&nbsp;<sup>30<\/sup> \uff1b\u5360\u603b IPV4 \u7684\u6bd4\u4f8b\u4e3a 25%\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Class C Networks (\/24 Prefixes)<\/h2>\n\n\n\n<p>This is a 24-bit network prefix; it has a 3 bit set to the highest order&nbsp;<strong>1-1-0<\/strong>. It is a 21-bit network number with 8-bit host number.<\/p>\n\n\n\n<p>C\u7c7b\u7f51\u7edc\u7684\u7f51\u7edc\u524d\u7f00\u662f 24 \u4f4d\u7684\uff1b \u5b83\u6700\u9ad8\u4f4d\u7684\u524d\u4e09\u4f4d\u987a\u5e8f\u6392\u5217\u4e3a 1-1-0\u3002 \u5b83\u7531 21 \u4f4d\u7684\u7f51\u7edc\u53f7\u548c 8 \u4f4d\u7684\u4e3b\u673a\u53f7\u7ec4\u6210\u3002<\/p>\n\n\n\n<p>This class defines a maximum of 2,097,152 (2&nbsp;<sup>21<\/sup>&nbsp;) \/24 networks. And each network supports up to 254 (2&nbsp;<sup>8<\/sup>&nbsp;-2) hosts. The entire class C network represents 2&nbsp;<sup>29<\/sup>&nbsp;(536,870,912) addresses; therefore it is only 12.5 % of the total IPv4.<\/p>\n\n\n\n<p>C\u7c7b\u7f51\u7edc\u5b9a\u4e49\u4e86\u6700\u591a 2,097,152 ( 2&nbsp;<sup>21<\/sup> )  \u4e2a\u7f51\u7edc\u3002 \u6bcf\u4e2a\u7f51\u7edc\u6700\u591a\u652f\u6301 254 ( 2&nbsp;<sup>8<\/sup>&nbsp;-2 ) \u53f0\u4e3b\u673a\u3002 \u6574\u4e2a C \u7c7b\u7f51\u7edc\u4e00\u5171\u6709 2&nbsp;<sup>29<\/sup> (536,870,912) \u4e2a\u5730\u5740\uff1b \u56e0\u6b64\u5b83\u4ec5\u5360 IPv4 \u603b\u91cf\u7684 12.5%\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Other Networks<\/h2>\n\n\n\n<p>\u8fd8\u6709\u53e6\u5916\u4e24\u4e2a\u4e0d\u5e38\u7528\u7684D \u7c7b\u7f51\u7edc\u548c E \u7c7b\u7f51\u7edc\u3002<br>D \u7c7b\u7684\u6700\u9ad8\u4f4d\u987a\u5e8f\u8bbe\u7f6e\u4e3a 1-1-1-0\uff0c\u7528\u4e8e\u591a\u64ad\u652f\u6301\u3002<br>E \u7c7b\u7684\u6700\u9ad8\u4f4d\u987a\u5e8f\u8bbe\u7f6e\u4e3a 1-1-1-1\uff0c\u7528\u4e8e\u5b9e\u9a8c\u4fdd\u7559\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u53c2\u8003\u94fe\u63a5<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>https:\/\/www.vskills.in\/certification\/tutorial\/a-b-and-c-classes-of-networks\/<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8ff0 \u8fd9\u51e0\u5929\u590d\u4e60\u7b80\u5355\u7684ABC\u7c7b\u7f51\u7edc\u7684\u65f6\u5019\u53d1\u73b0\u767e\u5ea6\u767e\u79d1\u4e0a\u9762\u5199\u7684\u6709\u70b9\u95ee\u9898\u2026\u2026\u91cd\u65b0\u7ffb\u4e86\u4e00\u4e0b\u4e66\u548c\u8d44\u6599\u6574\u7406\u4e86\u4e00\u4e0b\u3002 \u629b\u5f00IPV6\u4e0d\u8c08\uff0cIPV4\u7684\u4e92\u8054\u7f51\u5730\u5740\u662f\u7531\u7ba1\u7406\u4e92","protected":false},"author":1,"featured_media":302,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[7],"class_list":["post-178","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-study","tag-study"],"_links":{"self":[{"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/posts\/178","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/comments?post=178"}],"version-history":[{"count":9,"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/posts\/178\/revisions"}],"predecessor-version":[{"id":225,"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/posts\/178\/revisions\/225"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/media\/302"}],"wp:attachment":[{"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/media?parent=178"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/categories?post=178"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hoongdou.com\/index.php\/wp-json\/wp\/v2\/tags?post=178"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}