某主机的IP地址为130.252.20.168，子网掩码为255.255.255.0，求此主机的网络号、子网号和主机数 某主机的IP地址为140.252.20.68，子网掩码为25...
\u67d0\u4e3b\u673a\u7684IP\u5730\u5740\u4e3a140.252.20.70\uff0c\u5b50\u7f51\u63a9\u7801\u4e3a255.255.255.224\uff0c\u6c42\u6b64\u4e3b\u673a\u7684\u7f51\u7edc\u53f7\uff0c\u5b50\u7f51\u6570\u548c\u4e3b\u673a\u6570\u6b64\u4e3b\u673a\u7684\u7f51\u7edc\u53f7\u4e3a\uff1a140.252.20.64\u3002\u5b50\u7f51\u7684\u6570\u76ee\u4e3a\uff1a2048\uff0c\u4e3b\u673a\u7684\u6570\u76ee\u4e3a\uff1a30\u53f0\u3002
\u8ba1\u7b97\u8fc7\u7a0b\uff1a
\u56e0\u4e3aIP\u5730\u5740\u4e3a140.252.20.70\uff0c\u8f6c\u6362\u4e3a\u4e8c\u8fdb\u5236\u4e3a10001100.11111100.00010100.01000110\uff0c\u5c06\u5b50\u7f51\u63a9\u7801\u8f6c\u4e3a\u4e8c\u8fdb\u5236\u4e3a11111111.11111111.11111111.11100000\u3002
\u4e24\u8005\u8fdb\u884c\u76f8\u4e0e\u64cd\u4f5c\u7684\u51fa10001100.11111100.00010100.01000000\u3002\u5f97\u51fa\u7f51\u7edc\u53f7\u4e3a140.252.20.64\u3002
\u56e0\u4e3aIP\u5730\u5740\u4e3a140.252.20.70\uff0cB\u7c7bIP\u5730\u5740\u7684\u8303\u56f4\u4e3a128.0.0.0\u5230191.255.255.255\uff0c\u6240\u4ee5\u5f97\u51fa\u6b64\u4e3b\u673a\u7684\u7f51\u7edc\u5730\u5740\u4e3aB\u7c7bIP\u5730\u5740\u3002B\u7c7b\u5730\u5740\u7684\u5b50\u7f51\u63a9\u7801\u9ed8\u8ba4\u4e3a255.255.0.0\u3002
\u73b0\u5728\u5b50\u7f51\u63a9\u7801\u4e3a255.255.255.224\uff0c\u6240\u4ee5\u8fdb\u884c\u4e86\u5b50\u7f51\u5212\u5206\u3002\u62ff\u51fa\u4e8612\u4f4d\u505a\u5b50\u7f51\u5212\u5206\u6240\u4ee5\u5f97\u51fa\u5b50\u7f51\u6570\u4e3a2048\u3002
\u4e3b\u673a\u6570\u4e3a2^5-2=30\uff0c\u6240\u4ee5\u4e3b\u673a\u6570\u4e3a30\u3002
\u6269\u5c55\u8d44\u6599\uff1a
IP\u5730\u5740\u662f\u4ee5\u7f51\u7edc\u53f7\u548c\u4e3b\u673a\u53f7\u6765\u8868\u793a\u7f51\u7edc\u4e0a\u7684\u4e3b\u673a\u7684\uff0c\u53ea\u6709\u5728\u4e00\u4e2a\u7f51\u7edc\u53f7\u4e0b\u7684\u8ba1\u7b97\u673a\u4e4b\u95f4\u624d\u80fd\u201c\u76f4\u63a5\u201d\u4e92\u901a\uff0c\u4e0d\u540c\u7f51\u7edc\u53f7\u7684\u8ba1\u7b97\u673a\u8981\u901a\u8fc7\u7f51\u5173\uff08Gateway\uff09\u624d\u80fd\u4e92\u901a\u3002
\u8fd9\u6837\u7684\u5212\u5206\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u663e\u5f97\u5e76\u4e0d\u5341\u5206\u7075\u6d3b\u3002\u4e3a\u6b64IP\u7f51\u7edc\u8fd8\u5141\u8bb8\u5212\u5206\u6210\u66f4\u5c0f\u7684\u7f51\u7edc\uff0c\u79f0\u4e3a\u5b50\u7f51\uff08Subnet\uff09\uff0c\u8fd9\u6837\u5c31\u4ea7\u751f\u4e86\u5b50\u7f51\u63a9\u7801\u3002
\u5b50\u7f51\u63a9\u7801\u7684\u4f5c\u7528\u5c31\u662f\u7528\u6765\u5224\u65ad\u4efb\u610f\u4e24\u4e2aIP\u5730\u5740\u662f\u5426\u5c5e\u4e8e\u540c\u4e00\u5b50\u7f51\u7edc\uff0c\u8fd9\u65f6\u53ea\u6709\u5728\u540c\u4e00\u5b50\u7f51\u7684\u8ba1\u7b97\u673a\u624d\u80fd\u201c\u76f4\u63a5\u201d\u4e92\u901a\u3002
\u5b50\u7f51\u4f4d\u6570 \u3000\u5b50\u7f51\u63a9\u7801 \u3000\u4e3b\u673a\u6570 \u53ef\u7528\u4e3b\u673a\u6570
1\u3001 \u3000255.255.255.128 \u3000128 \u3000 126
2 \u3001\u3000255.255.255.192\u3000 64 \u3000 62
3 \u3001\u3000255.255.255.224 \u300032 \u3000 30
4 \u3001\u3000255.255.255.240 \u300016 \u300014
5\u3001\u3000 255.255.255.248 \u30008 \u3000 6
6 \u3001\u3000255.255.255.252 \u30004\u3000 \u3000 2
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u5b50\u7f51
140.252.20.68 \u4e00\u770b\u5c31\u662fB\u7c7b\u5730\u5740
\u56e0\u6b64\u4e3b\u673a\u4f4d\u662f20.68
\u7f51\u7edc\u53f7140.25.20.64
\u5b50\u7f51\u6570\uff1a2048
\u4e3b\u673a\uff1a30
10000010.11111100.00010100.10101000 130.252.20.168
+
11111111.11111111.11111111.00000000 255.255.255.0
=
10000010.11111100.00010100.00000000 130.252.20.0 (网络号）
130.252.20.168 是B类IP 默认掩码是255.255.0.0 ，转换2进制，对比变化在第3段。
11111111.11111111.11111111.00000000 255.255.255.0
11111111.11111111.00000000.00000000 255.255.0.0
11111111 转换2进制 得到255 子网号是255.
由掩码255.255.255.0 对比默认255.255.0.0 可知 新掩码网络位向主机位借位8位（转换换2进制观察），主机位还余8位（8个0） ，则每个子网可容纳2的8次方个IP地址256个，排除网络地址和广播地址，可分配主机地址为2的8次方-2=254个
你问对人了，我就是计算机专业的
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绛旓細涓绘満鍦板潃杞崲鎴愪簩杩涘埗涓10000010.00011001.00000011.10000111瀛愮綉鎺╃爜杞崲鎴愪簩杩涘埗涓11111111.11111111.11111111.11000000涓や釜鍦板潃鍚戝搴旂殑鍦板潃浣嶄笌杩愮畻锛堝叏1涓1锛屽叾瀹冧负0锛夊緱10000010.00011001.00000011.100000000杞崲鎴愬崄杩涘埗鍚庝负130.25.3.128鎵浠ヨ涓绘満鎵鍦ㄧ殑瀛愮綉缃戠粶鍦板潃涓120.25.3.128/26 ...
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