\u8ba1\u7b97\u673a\u7f51\u7edc\u5728\u5f53\u4eca\u7684\u751f\u6d3b\u4e2d\u53d8\u5f97\u8d8a\u6765\u8d8a\u91cd\u8981\u6240\u4ee5\u6211\u4eec\u9700\u8981\u5b66\u4e60\u7f51\u7edc\u77e5\u8bc6\u3002 \u7f51\u7edc\u901a\u4fe1\u5206\u4e3a\u5b66\u4e60\u7814\u7a76\u7684\u4fbf\u5229\u6027\uff0c\u7269\u7406\u5c42\u3001\u6570\u636e\u94fe\u8def\u5c42\u3001\u7f51\u7edc\u5c42\u3001\u4f20\u8f93\u5c42\u3001APP\u4f20\u8f93\u5c425\u5c42\u3002<\/p>\n\n\n\n
\u5728\u6570\u636e\u94fe\u8def\u5c42\u4e3b\u8981\u8d1f\u8d23\u6570\u636e\u4f20\u8f93\uff0c\u867d\u7136\u6709\u5f88\u591a\u534f\u8bae\uff0c\u4f46\u4f7f\u7528\u6700\u591a\u7684\u662f\u5c40\u57df\u7f51\u4e2d\u7684\u4ee5\u592a\u7f51\u534f\u8bae\u548c\u5e7f\u57df\u7f51\u4e2d\u7684PPP\u534f\u8bae\u3001HDLC\u534f\u8bae\u3002<\/p>\n\n\n\n
Etherne II\u9996\u90e88\u76ee\u7684\u5730\u5730\u57406\u6e90\u5730\u57406\u4ee5\u592a\u7f51\u7c7b\u578b2\u6709\u6548\u8f7d\u837746-1500\u5e27\u68c0\u67e5\u5e8f\u52174\u9996\u90e8\uff1a 8\u5b57\u8282\uff0c\u524d\u4e03\u4e2a0\u30011\u4ea4\u66ff\u5b57\u8282(10101010 )\u7528\u4e8e\u540c\u6b65\u63a5\u6536\u53f0\u62a5\u5934\u63d0\u4f9b\u63a5\u6536\u673a\u540c\u6b65\u548c\u5e27\u5b9a\u754c\u7b26\u670d\u52a1\u3002 \u76ee\u6807\uff1a 6\u5b57\u8282\u3001\u5355\u64ad\u3001\u591a\u64ad\u6216\u5e7f\u64ad\u3002 \u5355\u64ad\u5730\u5740\u4e5f\u79f0\u4e3a\u4e2a\u4eba\u3001\u7269\u7406\u3001\u786c\u4ef6\u6216MAC\u5730\u5740\u3002 \u5e7f\u64ad\u5730\u5740\u5168\u90e8\u4e3a1,0xffffff\u3002 \u6e90\u5730\u5740\uff1a 6\u5b57\u8282\u3002 \u6307\u793a\u53d1\u9001\u8282\u70b9\u7684\u5355\u64ad\u5730\u5740\u3002 \u4ee5\u592a\u7f51\u7c7b\u578b\uff1a\u8868\u793a\u4ee5\u592a\u7f51\u5e27\u5185\u5305\u542b\u7684\u4e0a\u5c42\u534f\u8bae\u76842\u5b57\u8282\u3002 \u5373\uff0c\u5e27\u683c\u5f0f\u7684\u534f\u8bae\u6807\u8bc6\u7b26\u3002 \u5bf9\u4e8eIP\u6d88\u606f\uff0c\u6b64\u5b57\u6bb5\u7684\u503c\u4e3a0x0800\u3002 \u5bf9\u4e8eARP\u4fe1\u606f\uff0c\u4ee5\u592a\u7f51\u7c7b\u578b\u5b57\u6bb5\u7684\u503c\u4e3a0x0806\u3002 \u6709\u6548\u8f7d\u8377\uff1a\u7531\u4e0a\u5c42\u534f\u8bae\u7684\u534f\u8bae\u6570\u636e\u5355\u5143PDU\u6784\u6210\u3002 \u53ef\u4ee5\u53d1\u9001\u7684\u6700\u5927\u6709\u6548\u8f7d\u8377\u4e3a1500\u5b57\u8282\u3002 \u7531\u4e8e\u4ee5\u592a\u7f51\u51b2\u7a81\u68c0\u6d4b\u7279\u6027\uff0c\u6709\u6548\u8f7d\u8377\u81f3\u5c11\u4e3a46\u5b57\u8282\u3002 \u5982\u679c\u4e0a\u5c42\u534f\u8bae\u7684\u6570\u636e\u5355\u5143\u957f\u5ea6\u5c0f\u4e8e46\u5b57\u8282\uff0c\u5219\u9700\u8981\u8865\u5145\u523046\u5b57\u8282\u3002 \u5e27\u68c0\u67e5\u5e8f\u5217\uff1a 4\u5b57\u8282\u3002 \u9a8c\u8bc1\u4f4d\u5b8c\u6574\u6027\u3002<\/p>\n\n\n\n
HDLC\u5e27\u683c\u5f0f<\/p>\n\n\n\n
\u5e27\u4fe1\u606f\u7684\u5206\u6bb5<\/strong><\/p>\n\n\n\n SDLC\/HDLC\u7684\u4e00\u5e27\u4fe1\u606f\u5305\u542b\u4ee5\u4e0b\u5b57\u6bb5\uff0c\u6240\u6709\u5b57\u6bb5\u4ece\u6700\u4f4e\u6709\u6548\u4f4d\u5f00\u59cb\u4f20\u8f93\uff1a<\/p>\n\n\n\n 1. SDLC\/HDLC\u6807\u5fd7\u5b57\u7b26<\/p>\n\n\n\n SDLC\/HDLC\u534f\u8bae\u8981\u6c42\u6240\u6709\u4fe1\u606f\u4f20\u8f93\u90fd\u5fc5\u987b\u4ee5\u4e00\u4e2a\u6807\u5fd7\u5b57\u7b26\u5f00\u59cb\uff0c\u5e76\u4ee5\u540c\u4e00\u5b57\u7b26\u7ed3\u675f\u3002 \u6b64\u6807\u5fd7\u5b57\u7b26\u4e3a01111110\uff0c\u79f0\u4e3a\u6807\u5fd7\u5b57\u6bb5(f )\u3002 \u4ece\u5f00\u59cb\u548c\u7ed3\u675f\u6807\u5fd7\u7ec4\u6210\u4e00\u4e2a\u5b8c\u6574\u7684\u4fe1\u606f\u5355\u5143\uff0c\u79f0\u4e3a\u201c\u4e00\u5e27\u201d(Frame )\u3002 \u6240\u6709\u4fe1\u606f\u90fd\u4f5c\u4e3a\u5e27\u4f20\u8f93\uff0c\u6807\u5fd7\u5b57\u7b26\u63d0\u4f9b\u6bcf\u4e2a\u5e27\u7684\u8fb9\u754c\u3002 \u63a5\u6536\u65b9\u53ef\u4ee5\u901a\u8fc7\u641c\u7d22\u201c01111110\u201d\u6765\u68c0\u6d4b\u5230\u5e27\u7684\u5f00\u59cb\u548c\u7ed3\u675f\uff0c\u5e76\u5efa\u7acb\u5e27\u540c\u6b65\u3002<\/p>\n\n\n\n PPP\u534f\u8bae\u6709\u4e09\u4e2a\u7ec4\u6210\u90e8\u5206\u3002e-height:26px;”>\uff081\uff09\u4e00\u4e2a\u5c06IP\u6570\u636e\u62a5\u5c01\u5230\u4e32\u884c\u94fe\u8def\u7684\u65b9\u6cd5\u3002PPP\u65e2\u652f\u6301\u5f02\u6b65\u94fe\u8def\uff08\u65e0\u5947\u5076\u6821\u9a8c\u76848\u6bd4\u7279\u6570\u636e\uff09\uff0c\u4e5f\u652f\u6301\u9762\u5411\u6bd4\u7279\u7684\u540c\u6b65\u94fe\u8def\u3002<\/p>\n\n\n\n \uff082\uff09\u4e00\u4e2a\u7528\u6765\u5efa\u7acb\u3001\u914d\u7f6e\u548c\u6d4b\u8bd5\u6570\u636e\u94fe\u8def\u7684\u94fe\u8def\u63a7\u5236\u534f\u8baeLCP\uff08Link Control Protocol\uff09\u3002\u901a\u4fe1\u7684\u53cc\u65b9\u53ef\u534f\u5546\u4e00\u4e9b\u9009\u9879\u3002\u5728[RFC 1661]\u4e2d\u5b9a\u4e49\u4e8611\u79cd\u7c7b\u578b\u7684LCP\u5206\u7ec4\u3002<\/p>\n\n\n\n \uff083\uff09\u4e00\u5957\u7f51\u7edc\u63a7\u5236\u534f\u8baeNCP\uff08Network Control Protocol\uff09\uff0c\u652f\u6301\u4e0d\u540c\u7684\u7f51\u7edc\u5c42\u534f\u8bae\uff0c\u5982IP\u3001OSI\u7684\u7f51\u7edc\u5c42\u3001DECnet\u3001AppleTalk\u7b49\u3002<\/p>\n\n\n\n \u4e8c\u3001PPP\u5e27\u683c\u5f0f<\/p>\n\n\n\n PPP\u5e27\u683c\u5f0f\u548cHDLC\u5e27\u683c\u5f0f\u76f8\u4f3c\uff0c\u5982\u56fe1\u6240\u793a\u3002\u4e8c\u8005\u4e3b\u8981\u533a\u522b\uff1aPPP\u662f\u9762\u5411\u5b57\u7b26\u7684\uff0c\u800cHDLC\u662f\u9762\u5411\u4f4d\u7684\u3002<\/p>\n\n\n\n \u3000\u3000\u3000\u3000\u3000\u3000\u3000<\/p>\n\n\n\n \u56fe1 PPP\u5e27\u683c\u5f0f<\/p>\n\n\n\n \u53ef\u4ee5\u770b\u51fa\uff0cPPP\u5e27\u7684\u524d3\u4e2a\u5b57\u6bb5\u548c\u6700\u540e\u4e24\u4e2a\u5b57\u6bb5\u4e0eHDLC\u7684\u683c\u5f0f\u662f\u4e00\u6837\u7684\u3002\u6807\u5fd7\u5b57\u6bb5F\u4e3a0x7E\uff080x\u8868\u793a7E\uff09\uff0c\u4f46\u5730\u5740\u5b57\u6bb5A\u548c\u63a7\u5236\u5b57\u6bb5C\u90fd\u662f\u56fa\u5b9a\u4e0d\u53d8\u7684\uff0c\u5206\u522b\u4e3a0xFF\u30010x03\u3002PPP\u534f\u8bae\u4e0d\u662f\u9762\u5411\u6bd4\u7279\u7684\uff0c\u56e0\u800c\u6240\u6709\u7684PPP\u5e27\u957f\u5ea6\u90fd\u662f\u6574\u6570\u4e2a\u5b57\u8282\u3002<\/p>\n\n\n\n \u4e0eHDLC\u4e0d\u540c\u7684\u662f\u591a\u4e862\u4e2a\u5b57\u8282\u7684\u534f\u8bae\u5b57\u6bb5\u3002\u534f\u8bae\u5b57\u6bb5\u4e0d\u540c\uff0c\u540e\u9762\u7684\u4fe1\u606f\u5b57\u6bb5\u7c7b\u578b\u5c31\u4e0d\u540c\u3002\u5982\uff1a<\/p>\n\n\n\n 0x0021\u2014\u2014\u4fe1\u606f\u5b57\u6bb5\u662fIP\u6570\u636e\u62a5<\/p>\n\n\n\n 0xC021\u2014\u2014\u4fe1\u606f\u5b57\u6bb5\u662f\u94fe\u8def\u63a7\u5236\u6570\u636eLCP<\/p>\n\n\n\n 0x8021\u2014\u2014\u4fe1\u606f\u5b57\u6bb5\u662f\u7f51\u7edc\u63a7\u5236\u6570\u636eNCP<\/p>\n\n\n\n 0xC023\u2014\u2014\u4fe1\u606f\u5b57\u6bb5\u662f\u5b89\u5168\u6027\u8ba4\u8bc1PAP<\/p>\n\n\n\n 0xC025\u2014\u2014\u4fe1\u606f\u5b57\u6bb5\u662fLQR<\/p>\n\n\n\n 0xC223\u2014\u2014\u4fe1\u606f\u5b57\u6bb5\u662f\u5b89\u5168\u6027\u8ba4\u8bc1CHAP<\/p>\n\n\n\n \u5f53\u4fe1\u606f\u5b57\u6bb5\u4e2d\u51fa\u73b0\u548c\u6807\u5fd7\u5b57\u6bb5\u4e00\u6837\u7684\u6bd4\u72790x7E\u65f6\uff0c\u5c31\u5fc5\u987b\u91c7\u53d6\u4e00\u4e9b\u63aa\u65bd\u3002\u56e0PPP\u534f\u8bae\u662f\u9762\u5411\u5b57\u7b26\u578b\u7684\uff0c\u6240\u4ee5\u5b83\u4e0d\u80fd\u91c7\u7528HDLC\u6240\u4f7f\u7528\u7684\u96f6\u6bd4\u7279\u63d2\u5165\u6cd5\uff0c\u800c\u662f\u4f7f\u7528\u4e00\u79cd\u7279\u6b8a\u7684\u5b57\u7b26\u586b\u5145\u3002\u5177\u4f53\u7684\u505a\u6cd5\u662f\u5c06\u4fe1\u606f\u5b57\u6bb5\u4e2d\u51fa\u73b0\u7684\u6bcf\u4e00\u4e2a0x7E\u5b57\u8282\u8f6c\u53d8\u62102\u5b57\u8282\u5e8f\u5217\uff080x7D\uff0c0x5E\uff09\u3002\u82e5\u4fe1\u606f\u5b57\u6bb5\u4e2d\u51fa\u73b0\u4e00\u4e2a0x7D\u7684\u5b57\u8282\uff0c\u5219\u5c06\u5176\u8f6c\u53d8\u62102\u5b57\u8282\u5e8f\u5217\uff080x7D\uff0c0x5D\uff09\u3002\u82e5\u4fe1\u606f\u5b57\u6bb5\u4e2d\u51fa\u73b0ASCII\u7801\u7684\u63a7\u5236\u5b57\u7b26\uff0c\u5219\u5728\u8be5\u5b57\u7b26\u524d\u9762\u8981\u52a0\u5165\u4e00\u4e2a0x7D\u5b57\u8282\u3002\u8fd9\u6837\u505a\u7684\u76ee\u7684\u662f\u9632\u6b62\u8fd9\u4e9b\u8868\u9762\u4e0a\u7684ASCII\u7801\u63a7\u5236\u5b57\u7b26\u88ab\u9519\u8bef\u5730\u89e3\u91ca\u4e3a\u63a7\u5236\u5b57\u7b26\u3002<\/p>\n\n\n\n \u4e09\u3001PPP\u94fe\u8def\u5de5\u4f5c\u8fc7\u7a0b<\/p>\n\n\n\n \u5f53\u7528\u6237\u62e8\u53f7\u63a5\u5165ISP\u65f6\uff0c\u8def\u7531\u5668\u7684\u8c03\u5236\u89e3\u8c03\u5668\u5bf9\u62e8\u53f7\u505a\u51fa\u5e94\u7b54\uff0c\u5e76\u5efa\u7acb\u4e00\u6761\u7269\u7406\u8fde\u63a5\u3002\u8fd9\u65f6PC\u673a\u5411\u8def\u7531\u5668\u53d1\u9001\u4e00\u7cfb\u5217\u7684LCP\u5206\u7ec4\uff08\u5c01\u88c5\u6210\u591a\u4e2aPPP\u5e27\uff09\u3002\u8fd9\u4e9b\u5206\u7ec4\u53ca\u5176\u54cd\u5e94\u9009\u62e9\u4e86\u5c06\u8981\u4f7f\u7528\u7684\u4e00\u4e9bPPP\u53c2\u6570\uff0c\u63a5\u7740\u5c31\u8fdb\u884c\u7f51\u7edc\u5c42\u57f9\u690d\uff0cNCP\u7ed9\u65b0\u63a5\u5165\u7684PC\u673a\u5206\u914d\u4e00\u4e2a\u4e34\u65f6\u7684IP\u5730\u5740\uff0c\u8fd9\u6837PC\u673a\u5c31\u6210\u4e3aInternet\u4e0a\u4e00\u4e2a\u4e3b\u673a\u4e86\u3002<\/p>\n\n\n\n \u5f53\u7528\u6237\u901a\u4fe1\u5b8c\u6bd5\u65f6\uff0cNCP\u91ca\u653e\u7f51\u7edc\u5c42\u8fde\u63a5\uff0c\u6536\u56de\u539f\u6765\u5206\u914d\u51fa\u53bb\u7684IP\u5730\u5740\u3002\u63a5\u7740LCP\u91ca\u653e\u6570\u636e\u94fe\u8def\u5c42\u8fde\u63a5\uff0c\u6700\u540e\u91ca\u653e\u7684\u662f\u7269\u7406\u5c42\u7684\u8fde\u63a5\u3002<\/p>\n\n\n\n \u4e0a\u8ff0\u8fc7\u7a0b\u53ef\u7528\u56fe2\u6765\u63cf\u8ff0\u3002<\/p>\n\n\n\n \u3000\u3000\u3000\u3000\u3000\u3000\u3000<\/p>\n\n\n\n \u56fe2 PPP\u534f\u8bae\u8fc7\u7a0b\u72b6\u6001\u56fe<\/p>\n\n\n\n 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