如果c类子网的掩码为255.255.255.248则包含的子网位数，子网数目，每个子网中主机数目 题20:如果C类子网的掩码 为255.255.255.224...
B\u7c7b\u5730\u5740\u5b50\u7f51\u63a9\u7801\u4e3a255.255.255.248\uff0c\u5219\u6bcf\u4e2a\u5b50\u7f51\u5185\u53ef\u7528\u4e3b\u673a\u5730\u5740\u6570\u4e3a\u591a\u5c11\uff1f\u6bcf\u4e2a\u5b50\u7f51\u5185\u53ef\u7528\u4e3b\u673a\u5730\u5740\u6570\u4e3a6\u4e2a\u3002
B\u7c7b\u7f51\u7edc\u7684\u9ed8\u8ba4\u5b50\u7f51\u63a9\u7801\u662f255.255.0.0\uff0c\u4eceIP\u5730\u5740\u4e2d\u8868\u793a\u4e3b\u673a\u53f7\u7684\u6700\u9ad8\u4f4d\u5f00\u59cb\u201c\u501f\u4f4d\u201d\u53d8\u4e3a\u65b0\u7684\u5b50\u7f51\u4f4d\uff0c\u6240\u5269\u4f59\u7684\u90e8\u5206\u5219\u4ecd\u4e3a\u4e3b\u673a\u4f4d\u3002\u6bcf\u4e2a\u5b50\u7f51\u7684\u6709\u6548\u4e3b\u673a\u5206\u522b\u662f\u5ffd\u7565\u5b50\u7f51\u5185\u51680\u548c\u51681\u7684\u5730\u5740\u3002\u5269\u4e0b\u7684\u5c31\u662f\u6709\u6548\u4e3b\u673a\u5730\u5740\u3002
\u6240\u4ee5\u5b50\u7f51\u63a9\u7801\u4e3a255.255.255.248\u7528\u4e8c\u8fdb\u5236\u8868\u793a\u4e3a\uff1a11111111.11111111.11111111.11111000\uff0c\u8868\u793a\uff0cIP\u5730\u5740\u540e\u4e09\u4f4d\u4e3a\u4e3b\u673a\u4f4d\uff0c\u5171\u67092\u7684\u4e09\u6b21\u65b9\u4e2a\u53738\u4e2a\uff0c\u540c\u65f6\u5ffd\u7565\u5b50\u7f51\u5185\u51680\u548c\u51681\u7684\u5730\u5740\uff0c\u5373\u5269\u4f596\u4e2a\u6709\u6548\u53ef\u7528\u4e3b\u673a\u5730\u5740\u3002
\u6269\u5c55\u8d44\u6599\uff1a
\u5b50\u7f51\u63a9\u7801\u7684\u529f\u80fd\uff1a
\u5b50\u7f51\u63a9\u7801\u662f\u4e00\u4e2a32\u4f4d\u5730\u5740\uff0c\u662f\u4e0eIP\u5730\u5740\u7ed3\u5408\u4f7f\u7528\u7684\u4e00\u79cd\u6280\u672f\u3002\u5b83\u7684\u4e3b\u8981\u4f5c\u7528\u6709\u4e24\u4e2a\uff0c\u4e00\u662f\u7528\u4e8e\u5c4f\u853dIP\u5730\u5740\u7684\u4e00\u90e8\u5206\u4ee5\u533a\u522b\u7f51\u7edc\u6807\u8bc6\u548c\u4e3b\u673a\u6807\u8bc6\uff0c\u5e76\u8bf4\u660e\u8be5IP\u5730\u5740\u662f\u5728\u5c40\u57df\u7f51\u4e0a\uff0c\u8fd8\u662f\u5728\u8fdc\u7a0b\u7f51\u4e0a\u3002\u4e8c\u662f\u7528\u4e8e\u5c06\u4e00\u4e2a\u5927\u7684IP\u7f51\u7edc\u5212\u5206\u4e3a\u82e5\u5e72\u5c0f\u7684\u5b50\u7f51\u7edc\u3002
\u4f7f\u7528\u5b50\u7f51\u662f\u4e3a\u4e86\u51cf\u5c11IP\u7684\u6d6a\u8d39\u3002\u56e0\u4e3a\u968f\u7740\u4e92\u8054\u7f51\u7684\u53d1\u5c55\uff0c\u8d8a\u6765\u8d8a\u591a\u7684\u7f51\u7edc\u4ea7\u751f\uff0c\u6709\u7684\u7f51\u7edc\u591a\u5219\u51e0\u767e\u53f0\uff0c\u6709\u7684\u53ea\u6709\u533a\u533a\u51e0\u53f0\uff0c\u8fd9\u6837\u5c31\u6d6a\u8d39\u4e86\u5f88\u591aIP\u5730\u5740\uff0c\u6240\u4ee5\u8981\u5212\u5206\u5b50\u7f51\u3002\u4f7f\u7528\u5b50\u7f51\u53ef\u4ee5\u63d0\u9ad8\u7f51\u7edc\u5e94\u7528\u7684\u6548\u7387\u3002
\u901a\u8fc7\u8ba1\u7b97\u673a\u7684\u5b50\u7f51\u63a9\u7801\u5224\u65ad\u4e24\u53f0\u8ba1\u7b97\u673a\u662f\u5426\u5c5e\u4e8e\u540c\u4e00\u7f51\u6bb5\u7684\u65b9\u6cd5\u662f\uff0c\u5c06\u8ba1\u7b97\u673a\u5341\u8fdb\u5236\u7684IP\u5730\u5740\u548c\u5b50\u7f51\u63a9\u7801\u8f6c\u6362\u4e3a\u4e8c\u8fdb\u5236\u7684\u5f62\u5f0f\uff0c\u7136\u540e\u8fdb\u884c\u4e8c\u8fdb\u5236\u201c\u4e0e\u201d(AND)\u8ba1\u7b97\uff08\u51681\u5219\u5f971\uff0c\u4e0d\u51681\u5219\u5f970\uff09\uff0c\u5982\u679c\u5f97\u51fa\u7684\u7ed3\u679c\u662f\u76f8\u540c\u7684\uff0c\u90a3\u4e48\u8fd9\u4e24\u53f0\u8ba1\u7b97\u673a\u5c31\u5c5e\u4e8e\u540c\u4e00\u7f51\u6bb5\u3002
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-IP\u5b50\u7f51\u5212\u5206
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u5b50\u7f51\u63a9\u7801
C\u7c7b\u7f51\u7edc\u9ed8\u8ba4\u63a9\u7801\u662f24\u4f4d\uff0c\u73b0\u5728\u662f27\u4f4d\uff0c\u56e0\u6b64\u5b50\u7f51\u4f4d\u6570\u662f27-24=3\u4f4d\u3002\u5b50\u7f51\u6570\u76ee\u662f2^3=8\u4e2a\u3002\u6bcf\u4e2a\u5b50\u7f51\u7684\u6709\u6548IP\u5730\u5740\u6570\u91cf\u662f2^\uff0832-27\uff09-2=30\u4e2a\u3002
255.255.255.248即255.255.255.1111 1000所以子网位数是5
子网数目是2^5=32
每个子网的主机数目2^3-2=6
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绛旓細鎮ㄥソ锛屽悓缃戞鐨処P鍦板潃鑼冨洿鏄浠172.31.255.2~172.31.255.255锛屽缓璁笉瑕佷娇鐢ㄨ竟缂樺湴鍧1鍜255锛屽洜涓鸿竟缂樺湴鍧涓鑸槸璺敱鍣ㄥ湴鍧鎴栬呯粓绔湴鍧锛屽彲鑳戒細琚璁ゃ傚笇鏈涢噰绾筹紝鎰熻阿~
绛旓細ip鍦板潃鐢ㄤ簩杩涘埗琛ㄧず涓 11010011.01000010.01100100.01100001 瀛愮綉鎺╃爜鐢ㄤ簩杩涘埗琛ㄧず涓 11111111.11111111.11111111.11100000 杩涜涓庤繍绠楀悗缁撴灉涓 11010011.01000010.01100100.01100000 鍗211.66.100.96 杩欏氨鏄墍姹傜殑缃戠粶鍙凤紝瀛愮綉鍙蜂负96锛屼富鏈哄彿涓1銆
绛旓細瑙ｏ細1銆172.16.y.y鏄竴涓狟绫荤綉锛瀛愮綉鎺╃爜鏍煎紡涓255.255.M.0 2銆4涓瓙缃戯紝4鎺ヨ繎2鐨勫啣鏄8锛2^3锛夛紝鎵浠ubnet_block=8 Subnet_num=8-2=6 3銆両P_block=256/Subnet_block=256/8=32 4銆佸瓙缃戞帺鐮丮=256-IP_block=256-32=224 5銆佹墍浠ュ瓙缃戞帺鐮佽〃绀涓255.2...
