局域网本质上是广播的
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\u4ee5\u592a\u7f51\u7684\u8bdd\uff0c\u4ea4\u6362\u673a\u7ec4\u6210\u7684\u5c40\u57df\u7f51\u53d1\u751f\u51b2\u7a81\u5f53\u7136\u662fCSMA/CD\u3002
ARP\u5efa\u7acb\u8d77\u6765MAC\u8868\u7b49\u4e8e\u70b9\u5bf9\u70b9\u4f20\u8f93\u554a\uff0c\u56e0\u4e3a\u4ea4\u6362\u673a\u6536\u5230\u4e00\u4e2a\u6570\u636e\u5e27\uff0c\u8fd9\u4e2a\u6570\u636e\u5e27\u6807\u660e\u7684MAC\u5728\u4ea4\u6362\u673a\u7684MAC\u8868\u4e2d\uff0c\u90a3\u4ea4\u6362\u673a\u5c31\u667a\u80fd\u7684\u628a\u8fd9\u4e2a\u6570\u636e\u5e27\u53d1\u5230\u5230\u76f8\u5e94\u7684\u7aef\u53e3\u4e2d\uff08\u8fd9\u91cc\u6bd4\u5982\u6bcf\u4e2a\u7aef\u53e3\u5355\u72ec\u63a5\u4e00\u53f0\u7535\u8111\uff09\uff0c\u56e0\u4e3a\u4ea4\u6362\u673a\u5df2\u7ecf\u628a\u6bcf\u53f0\u7535\u8111\u7684MAC\u6620\u5c04\u5230\u7535\u8111\u6240\u63a5\u7684\u7aef\u53e3\u4e0a\u4e86\uff1b\u5047\u5982\u4ea4\u6362\u673a\u7684MAC\u8868\u4e2d\u627e\u4e0d\u5230\u90a3\u4e2a\u6570\u636e\u5e27\u6807\u660e\u7684MAC\uff0c\u5c31\u5e7f\u64ad\u7ed9\u4ea4\u6362\u673a\u7684\u6bcf\u4e2a\u7aef\u53e3\uff0c\u5047\u5982\u4ea4\u6362\u673a\u4e0a\u7684\u7aef\u53e3\u76f8\u5e94\u4e86\uff0c\u5c31\u597d\u6bd4\u90a3\u4e2a\u7aef\u53e3\u4e0a\u7684\u7535\u8111\u8bf4\uff1a\u201c\u5582\uff0c\u4ea4\u6362\u673a\u554a\uff0c\u4f60\u5e7f\u64ad\u7684\u90a3\u4e2a\u6570\u636e\u5e27\u662f\u6211\u7684\uff0c\u6211\u73b0\u5728\u628a\u6211\u7684MAC\u5730\u5740\u7ed9\u4f60\uff0c\u4f60\u8bb0\u7740\u4e86\uff0c\u4e0b\u6b21\u8fd8\u6709\u6211\u7684\u6570\u636e\u5e27\u5c31\u4e0d\u7528\u5e7f\u64ad\uff0c\u5355\u72ec\u53d1\u5230\u6211\u8fd9\u4e2a\u7aef\u53e3\u6765\u5c31\u662f\u4e86\u201d\u3002\u7136\u540e\u4ea4\u6362\u673a\u7684MAC\u8868\u7b49\u4e8e\u53c8\u767b\u8bb0\u4e86\u4e00\u4e2aMAC\u5730\u5740\uff0c\u4e0b\u6b21\u6709\u8fd9\u4e2aMAC\u7684\u6570\u636e\u5e27\u65f6\u5c31\u4e0d\u5e7f\u64ad\uff0c\u662f\u70b9\u5bf9\u70b9\u4e86\u3002
INTERNET\u4e0a\u7684\u6570\u636e\u5305\u4f20\u9001\u5b58\u5728\u5e7f\u64ad\u5f0f\u4f20\u8f93\uff0c\u8fd9\u79cd\u5e7f\u64ad\u5f0f\u7684\u60c5\u51b5\u53d1\u751f\u5728\u8def\u7531\u5668\u63a5\u5230\u4e00\u4e2a\u6570\u636e\u5305\uff0c\u7ed3\u679c\u53d1\u73b0\u6570\u636e\u5305\u6807\u660e\u7684IP\u7684\u7f51\u7edc\u5730\u5740\u4e2d\uff0c\u4e0d\u5728\u8def\u7531\u5668\u7684IP\u5730\u5740\u8868\u4e2d\uff0c\u90a3\u8def\u7531\u5668\u662f\u4e0d\u662f\u56e0\u4e3a\u8fd9\u6837\u5c31\u4e22\u5f03\u8fd9\u4e2a\u6570\u636e\u5305\u5462\uff1f\u80af\u5b9a\u4e0d\u4f1a\uff0c\u6240\u4ee5\u4eba\u4eec\u5c31\u8bbe\u8ba1\u8def\u7531\u5668\u628a\u8fd9\u4e2a\u6570\u636e\u5305\u5e7f\u64ad\u51fa\u53bb\uff0c\u770b\u5176\u4ed6\u7684\u8def\u7531\u5668\u6709\u8c01\u61c2\u8fd9\u4e2a\u6570\u636e\u5305\u8be5\u600e\u4e48\u53d1\uff1f\u6bd4\u5982A\u8def\u7531\u5668\u4e0d\u61c2\u4e00\u4e2a\u6570\u636e\u5305\u600e\u4e48\u53d1\uff0c\u5e7f\u64ad\u51fa\u53bb\u540e\uff0cB\u8def\u7531\u5668\u8bf4\u6211\u61c2\uff0c\u5c31\u7ed9A\u8def\u7531\u5668\u4e00\u4e2a\u76f8\u5e94\uff0c\u7136\u540e\uff0cA\u8def\u7531\u5668\u4e0b\u6b21\u518d\u78b0\u5230\u8fd9\u79cd\u6570\u636e\u5305\u7684\u65f6\u5019\uff0c\u5c31\u4e0d\u7528\u518d\u5e7f\u64ad\u51fa\u53bb\uff0c\u56e0\u4e3a\u5b83\u53ea\u8981\u4ea4\u7ed9B\u8def\u7531\u5668\u5c31\u884c\u4e86\uff0c\u8fd9\u5c31\u53c8\u53d8\u6210\u70b9\u5bf9\u70b9\u7684\u4e86\u3002
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\u8fd8\u6709\u73b0\u5728\u7684\u5c40\u57df\u7f51\u662f\u70b9\u5bf9\u70b9\u554a\uff0c\u4f60\u7684\u7591\u60d1\u662f\u4e0d\u662fCSMA/CD\u548c\u70b9\u5bf9\u70b9\u7684\u5173\u7cfb\u4e0d\u592a\u6e05\u695a\uff1f
\u4ee5\u4ea4\u6362\u673a\u4e3a\u4e2d\u5fc3\u7684\u661f\u5f62\u4ee5\u592a\u7f51\u662f\u70b9\u5bf9\u70b9\u4f20\u8f93\u7684\u3002\u53ea\u8981\u4ed6\u4eec\u901a\u8fc7arp\u5efa\u7acb\u4e86mac\u8868\u3002
\u4ee5\u96c6\u7ebf\u5668\u4e3a\u4e2d\u5fc3\u7684\u661f\u5f62\u4ee5\u592a\u7f51\u662f\u6cdb\u5b8f\u4f20\u64ad\u7684\uff0c\u4e5f\u5c31\u662f\u6bcf\u4e2a\u4e3b\u673a\u90fd\u80fd\u6536\u5230\u5176\u4ed6\u6240\u6709\u4e3b\u673a\u7684\u901a\u8baf\uff0c\u53ea\u4e0d\u8fc7\u4e0d\u8be5\u4ed6\u63a5\u53d7\u7684\u4ed6\u4e0d\u7406\u4f1a\u800c\u5df2\u3002
cmsa/cd\u53ea\u4e0d\u8fc7\u662f\u4e3a\u4e86\u89e3\u51b3\u51b2\u7a81\u800c\u8bbe\u8ba1\u7684\u8f7d\u6ce2\u4fa6\u542c\u800c\u5df2\uff0c\u5728\u4ea4\u6362\u673a\u7684\u5168\u53cc\u5de5\u72b6\u6001\u4e0b\uff0c\u4f9d\u7136\u662f\u70b9\u5bf9\u70b9\u5de5\u4f5c\u3002
\u9664\u975e\u4f60\u5728\u4ea4\u6362\u673a\u4e0a\u53c8\u63a5\u4e86\u4e2ahub\uff0c\u624d\u4f1a\u53d8\u6210\u534a\u53cc\u5de5\uff0c\u624d\u4f1acmsa/cd\u89e3\u51b3\u51b2\u7a81
传输方式,局域网一般采用以太网,使用的网络结构是总线型的,使用带有冲突检测的载波侦听多路访问CSMA/CD,而且HUB是广播式的,所以说:"局域网本质上是广播的";
第一.broadcast(广播)在局域网是在正常不过的了.局域网里一半以上的流量都
是广播包.DHCP需要广播,arp请求更是广播,ssdp也是广播.很多协议都是广播的.
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