{"id":758,"date":"2008-05-05T11:07:00","date_gmt":"2008-05-05T03:07:00","guid":{"rendered":"http:\/\/note.systw.net\/note\/?p=758"},"modified":"2023-11-06T21:03:01","modified_gmt":"2023-11-06T13:03:01","slug":"ether-device","status":"publish","type":"post","link":"https:\/\/systw.net\/note\/archives\/758","title":{"rendered":"Ether-Device"},"content":{"rendered":"\n

Port(\u57e0)<\/strong>
\u7db2\u8def\u8a2d\u5099\u4e0a\u7528\u4f86\u63d2\u7db2\u8def\u7dda\u7684\u5b54 <\/p>\n\n\n\n

\u7db2\u8def\u8a2d\u5099\u7684Port\u76f8\u95dc\u540d\u8a5e<\/strong>
half-duplex(\u534a\u96d9\u5de5)<\/strong>:\u5169\u8a2d\u5099\u4e0d\u53ef\u540c\u6642\u96d9\u5411\u50b3\u8f38,\u6548\u7387\u5dee
full-duplex(\u5168\u96d9\u5de5)<\/strong>:\u5169\u8a2d\u5099\u53ef\u540c\u6642\u96d9\u5411\u50b3\u8f38,\u4f46\u5169\u7aef\u8981\u6709\u652f\u63f4\u5168\u96d9\u5de5,\u7406\u8ad6\u4e0a\u901f\u5ea6\u662f\u534a\u96d9\u5de5\u7684\u5169\u500d,\u7121\u6cd5\u5728hub\u4e0a\u904b\u4f5c
ps:\u7576\u4e00\u7aef\u88ab\u8a2d\u70bahalf-duplex,\u800c\u53e6\u4e00\u7aef\u88ab\u8a2d\u70bafull-duplex,\u5247\u5169\u7aef\u7121\u6cd5\u901a\u8a0a 

\u7db2\u8def\u8a2d\u5099\u7684Port\u76f8\u95dc\u6280\u8853<\/strong>
auto-sense<\/strong>:\u53ef\u4ee5\u81ea\u52d5\u9069\u61c9\u51fa100M\u548c10M\u901f\u7387 
Auto-Negotiation(\u81ea\u52d5\u5354\u5546)<\/strong>:\u81ea\u52d5\u6c7a\u5b9aduplex mode(\u4f7f\u7528half-duplex\u6216full-duplex)
\u3000\u5169\u908a\u4ecb\u9762\u9700\u652f\u63f4:\u5169\u908a\u6839\u64daelectrical signaling\u6c7a\u5b9a\u8981\u7528\u4ec0\u9ebcduplex mode\u3000 
\u3000\u9806\u5e8f\u901a\u5e38\u70ba\u6700\u5feb\u5230\u6700\u6162\u3000ex:100M\u5168\u96d9\u5de5,100m\u534a\u96d9\u5de5,10M\u534a\u96d9\u5de5
auto-MDI<\/strong>\/MDIX<\/strong>:\u53ef\u81ea\u52d5\u5075\u6e2c\u5e73\u884c\u7dda\u53ca\u8df3\u7dda,\u63db\u53e5\u8a71\u8aaa\u6709\u6b64\u529f\u80fd\u7684switch\u53ef\u76f4\u63a5\u4e92\u9023,\u800c\u4e0d\u7528\u5728\u63a5\u8df3\u7dda
Ethernet Channel<\/strong>:\u5c07\u591aport\u5728\u908f\u8f2f\u4e0a\u5408\u6210\u4e00\u500b,\u53ef\u589e\u52a0\u983b\u5bec,\u8ca0\u8f09\u5747\u8861,\u7dda\u8def\u5099\u4efd <\/p>\n\n\n\n

………………………………………………………….<\/p>\n\n\n\n

Repeater(\u589e\u76ca\u5668)\u548c<\/strong>Hub(\u96c6\u7dda\u5668)\u3000<\/strong>
<\/strong>\u8ca0\u8cacOSI\u7b2c1\u5c64,\u9023\u7d50\u5169\u7aef\u7db2\u8def\u7684\u985e\u6bd4\u5f0f\u8a2d\u5099,\u53ea\u61c2\u4f0f\u7279
\u662f\u518d\u751f\u5668\u800c\u975e\u653e\u5927\u5668<\/p>\n\n\n\n

Hub
<\/strong>\u5c31\u662f\u591a\u500bport\u7684Repeater
hub\u6bcf\u500bport\u90fd\u8996\u70barepeater,\u4e5f\u7a31mutliport repeater 
<\/strong>\u5404port\u70ba\u5171\u4eab\u983b\u5bec,\u55ae\u4e00collision domain,\u53ea\u80fd\u8dd1\u534a\u96d9\u5de5
\u50b3\u90010\u82071\u7684\u8a0a\u865f\u8cc7\u6599,\u7121\u6cd5\u8a18\u61b6MAC address<\/p>\n\n\n\n

\u4f9d\u8a0a\u865f\u662f\u5426\u653e\u5927,\u53ef\u5206\u70ba:
active(\u4e3b\u52d5\u5f0f)<\/strong>\u8a0a\u865f\u50b3\u51fa\u524d\u9700\u4f7f\u7528\u96fb\u6e90\u624d\u53ef\u5c07\u50b3\u5165\u7684\u8a0a\u865f\u653e\u5927
passive(\u88ab\u52d5\u5f0f)<\/strong>\u53ea\u63d0\u4f9b\u5be6\u969b\u7684\u9023\u63a5\u9ede,\u8a0a\u865f\u4e0d\u653e\u5927,\u4f46\u4e0d\u9700\u96fb\u529b\u5373\u53ef\u4f7f\u7528
ps:\u82e5\u6709up-link\u63d2\u5b54\u53ef\u4e32\u63a5\u6210\u6a39\u72c0\u5340\u57df\u7db2\u8def
ps:intelligent hub(\u667a\u6167\u578b),\u4e5f\u7a31smart hub,\u5c6cactive,\u542b\u6676\u7247\u548c\u8a3a\u65b7\u529f\u80fd,\u50f9\u683c\u7a0d\u9ad8<\/p>\n\n\n\n

543\u6e96\u5247\/54321\u898f\u5247<\/strong>
\u70ba\u89e3\u6c7a\u7531hub\u6240\u5efa\u7acb\u7684\u7db2\u8def\u554f\u984c
\u898f\u5247\u63cf\u8ff0\u5982\u4e0b\u3000
1.\u4f7f\u75284\u500brepeater\u6216hub
2.\u53ea\u53ef\u67095\u500bsegment
3.3\u500bsegment\u53ef\u70bapopulation(\u96fb\u8166\u7fa4\u9ad4),\u4f46\u5728\u661f\u72c0\u62d3\u6a38\u4e0b\u7121\u6b64\u9650\u5236
4.\u53e6\u59162\u500bsegment\u70balink segment(\u9023\u7d50\u7db2\u6bb5):\u76ee\u5730\u53ea\u662f\u5ef6\u4f38\u78b0\u649e\u7db2\u8def\u4e4b\u7bc4\u570d
5.\u6700\u5f8c\u6703\u5f62\u62101\u500b\u5927\u78b0\u649e\u7db2\u57df
ps:segment:\u5728\u7269\u7406\u9023\u63a5\u4e0a\u76f4\u63a5\u76f8\u9130\u800c\u6c92\u7d93bridge\u5340\u9694<\/p>\n\n\n\n

 <\/p>\n\n\n\n

………………………………………………………………………………………..<\/p>\n\n\n\n

Bridge(\u6a4b\u63a5\u5668)\u548cSwitch(\u4ea4\u63db\u5668)<\/strong>
\u9023\u63a5\u4e0d\u540c\u7684segment(\u7db2\u8def\u5340\u6bb5)\u7684\u8a2d\u5099,ex:ethernet\u9023tokenring
\u8ca0\u8cacOSI\u7b2c\u4e8c\u5c64 
\u55ae\u4e00broadcast domain(\u5ee3\u64ad\u9818\u57df)
\u591acollision domain(\u78b0\u649e\u9818\u57df):\u5404\u5340\u6bb5\u6709\u5404\u5225\u7684collision domain  \u3000
\u3000ps:\u591acollision domain\u6703\u6bd4\u55ae\u4e00collison domain\u7684\u6709\u66f4\u591a\u983b\u5bec\u3000
\u4ee5mac address\u4f86\u505a\u50b3\u9001\u7684\u6c7a\u5b9a
\u53ea\u53ef\u9023\u76f8\u540cnet(\u7db2\u6bb5)\u53ca\u76f8\u540cprotocol
high throughput lower overhead:\u901f\u5ea6\u6bd4\u8def\u7531\u5668\u5feb,\u56e0\u70ba\u53ea\u9700\u6aa2\u67e5mac address,\u4e0d\u7528\u50cfrouter\u9084\u8981\u591a\u6aa2\u67e5\u7db2\u8def\u5c64\u6a19\u982d\u8cc7\u8a0a 
\u6f5b\u5728\u554f\u984c
<\/strong>\u50b3\u5165\u6bd4\u50b3\u51fa\u5feb\uff0c\u5c0e\u81f4\u7de9\u885d\u5340\u4e0d\u5920\u6642\u5247\u6703\u4e1f\u6389frame(\u8a0a\u6846)<\/p>\n\n\n\n

Bridge <\/strong> 
\u53ea\u67092\u500bport\u6240\u4ee5\u53ea\u80fd\u5206\u70ba2\u500bcollision domain 
ps:
\u76f8\u95dc\u6280\u8853
learning bridge:(\u5927\u90e8\u4efdbridge\u90fd\u6709\u6b64\u529f\u80fd)\u3000 
\u3000\u80fd\u5920\u8ffd\u8e64\u6bcf\u500b\u7bc0\u9ede\u4f4d\u5740\u7684bridge 
\u3000\u6709flooding\u529f\u80fd\u7528\u4f86\u5b78\u7fd2,\u4e26\u5167\u5efamac address table\u8a18\u4f86\u6e90\u4f4d\u7f6e
half-bridge\/remote bridge:
\u3000\u5c07\u904e\u6ffe\u548c\u50b3\u905e\u5de5\u4f5c\u5206\u958b\u7684bridge<\/p>\n\n\n\n

Switch(\u4ea4\u63db\u5668)<\/strong>
\u53ef\u8996\u70bamulti-port bridge,\u5404port\u53ef\u8996\u70bamicrobridge(\u5fae\u6a4b\u63a5\u5668)\u56e0\u6b64\u6709\u7368\u7acb\u983b\u5bec
Port\u7a2e\u985e\u6c7a\u5b9a\u50b3\u8f38\u578b\u614b\u8207\u901f\u5ea6,\u6578\u91cf\u6c7a\u5b9a\u80fd\u7ba1\u7406\u8207\u9023\u901a\u7684\u5340\u6bb5
microsegmantation(\u5fae\u5340\u6bb5):\u5404microbridge\u4f9b\u7d66\u4e3b\u6a5f\u5b8c\u6574\u7684\u5a92\u9ad4\u983b\u5bec\u63a5\u6536\u5b58\u53d6,\u4e0d\u9808\u8207\u5176\u4ed6\u4e3b\u6a5f\u722d\u596a\u53ef\u7528\u983b\u5bec,\u4e5f\u53ef\u6e1b\u5c11\u78b0\u649e\u6b21\u6578
\u512a\u9ede
<\/strong>\u50b3\u8f38\u652f\u63f4\u5168\u96d9\u5de5(\u53ef\u907f\u514dcollision)\u8207\u534a\u96d9\u5de5\u6a21\u5f0f
\u7de9\u885d\u5340\u6bd4\u6a4b\u63a5\u5668\u5927,\u4e5f\u4e0d\u56e0\u70ba\u78b0\u649e\u907a\u5931frame(\u8a0a\u6846)
backpressure(\u56de\u58d3):\u7522\u751f\u885d\u649e\u8a0a\u865f\u7684\u6280\u8853,\u89e3\u6c7a\u76ee\u7684\u5730\u885d\u7a81\u554f\u984cps:
Switching Hub
\u4e00\u822c\u5bb6\u7528\u7684\u57fa\u672cswitch\u90fd\u5c6c\u9019\u7a2e 
\u901a\u5e38\u53ef\u8dd1\u534a\u96d9\u5de5\u53ca\u5168\u96d9\u5de5
\u591a\u78b0\u649e\u9818\u57df:Switching\u6307\u7684\u662f\u652f\u63f4\u5c07\u7db2\u8def\u5c01\u5305\u76f4\u63a5\u50b3\u9001\u5230\u6307\u5b9a\u7684\u7db2\u8def\u5b54\u4f4d\u53bb,\u6548\u80fd\u6bd4\u8d77\u50b3\u7d71\u7684Hub\u8981\u597d 
\u7121\u6cd5\u5207\u5272VLAN,\u8ddfSwitch\u7684\u50f9\u5dee\u6700\u5c11\u6709\u4e00\u500d\u4ee5\u4e0a 
\u99ed\u5ba2\u53ef\u5229\u7528Sniffer\u7a0b\u5f0f\u9032\u884c\u7aca\u53d6\u7db2\u8def\u8cc7\u6599\u7684\u52d5\u4f5c  <\/p>\n\n\n\n

\u4e0d\u540cOSI\u5c64\u7d1a\u7684switch \u3000<\/strong>
\u6539\u826f\u5f8c\u7684switch\u751a\u81f3\u53ef\u61c9\u7528\u5728\u4e0d\u540cOSI\u5c64\u7d1a\uff0c\u50cf\u662fL3,L4,L5,L7 \u7b49,\u4f46\u4e0d\u540c\u5c64\u7d1a\u50f9\u683c\u5dee\u7570\u5927
l2switch<\/strong>(\u539f\u672c\u7684\u529f\u80fd):\u5206\u6bb5,\u4e5f\u7a31lan switch\u6216workgroup switch,\u901a\u5e38\u7528\u4f86\u53d6\u4ee3hub
l3switch<\/strong>:\u8def\u7531,\u5c01\u5305\u904e\u6ffe\u8f49\u5411,\u53ef\u57f7\u884catm\u4ea4\u63db\u670d\u52d9\u7b49\u7b2c3\u5c64\u529f\u80fd
l4switch<\/strong>:\u53ef\u9760\u9023\u7d50,\u8ca0\u8f09\u5e73\u8861,fault tolerance,multi-layer switch:\u53ef\u505aOSI\u7b2c2-4\u5c64\u5de5\u4f5c<\/p>\n\n\n\n

switch\u76f8\u95dc\u6280\u8853\u3000
<\/strong>CAM(content addressable memory,\u5167\u5bb9\u5c0b\u5740\u6027\u8a18\u61b6\u9ad4)<\/strong>:
\u65bc\u8a18\u61b6\u9ad4\u4e2d\u8f38\u5165\u8cc7\u6599,\u6703\u56de\u50b3\u95dc\u806f\u6027\u4e4b\u4f4d\u5740
\u53ef\u8b93switch\u76f4\u63a5\u627e\u51fa\u8207mac\u4f4d\u5740\u76f8\u95dc\u806f\u7684port,\u800c\u4e0d\u9700\u8981\u4f7f\u7528\u641c\u5c0b\u6f14\u7b97\u6cd5
ASIC(application-specific integrated circuit,\u7279\u5b9a\u61c9\u7528\u7a4d\u9ad4\u96fb\u8def)<\/strong>:
\u7531logic gate(\u975e\u56fa\u5b9a\u908f\u8f2f\u9598)\u6240\u7d44\u6210\u7684\u8a2d\u5099
\u4ee5\u786c\u9ad4\u7684\u65b9\u5f0f\u9054\u6210\u8edf\u9ad4\u53ef\u5b8c\u6210\u7684\u529f\u80fd,\u53ef\u6e1b\u5c11\u8edf\u9ad4\u6240\u7522\u751f\u7684\u5ef6\u9072,\u63d0\u6607\u6548\u80fd
ps:
\u90e8\u4efd\u9ad8\u968eswitch\u6703\u652f\u63f4802.1q,\u5373VLAN\u529f\u80fd(\u53ef\u8b8a\u591abroadcast domain),\u6216spanning tree protocol\uff0ctrunk links\u7b49\u6280\u8853<\/p>\n\n\n\n

ps:
Ether-Switch\u5e38\u898b\u67b6\u69cb
Control Processor(\u63a7\u5236\u8655\u7406\u6a5f)
Switching Element(\u4ea4\u63db\u5143\u4ef6)
Buffer(\u7de9\u885d\u5668)
Routing Table(\u8def\u5f91\u8868)\uff1a\u53ef\u652f\u63f4l3\u529f\u80fd<\/p>\n\n\n\n

…………..<\/p>\n\n\n\n

switch\/bridge\u904b\u4f5c\u539f\u7406<\/strong><\/p>\n\n\n\n

\u4e3b\u8981\u505a\u4ee5\u4e0b\u52d5\u4f5c:
Discovery\/listen<\/strong>:\u76e3\u807d\u6240\u6709interface\u662f\u5426\u6709frame\u5230\u9054
mapping\/learning<\/strong>;\u6536\u5230frame\u6642\u767c\u73fe\u672a\u77e5source-mac,\u5247\u5728mac-table\u8a18\u9304\u8a72mac\u5c6c\u65bc\u8a72interface 
Filtering<\/strong>:\u82e5frame\u7684\u76ee\u5730\u8207\u4f86\u6e90\u5728\u76f8\u540c\u7684lan segment,\u5247\u4e0d\u6703\u5c07frame\u50b3\u9001\u5230\u5176\u4ed6lan segment
Forwarding<\/strong>:\u6536\u5230frame\u7684\u76ee\u7684\u7aef\u4e0d\u5728\u540c\u4e00\u500blan segment\u6642,\u5247\u5c07frame\u9001\u5230\u5176\u4ed6lan segment,\u82e5\u683c\u5f0f\u4e0d\u540c\u6703\u9032\u884c\u8f49\u63db
flooding\/unknown unicast flooding<\/strong>:\u6536\u5230frame\u6642\u82e5\u4e0d\u77e5\u76ee\u7684\u5730\u6642,\u5247\u5c07frame\u9001\u5230\u6240\u6709\u4ecb\u9762\u9032\u884c\u5206\u6790,\u4f46\u4f86\u6e90\u4ecb\u9762\u9664\u5916
ps:flooding algorithm(\u6c3e\u6feb\u6f14\u7b97\u6cd5):\u8868\u82e5\u7a7a\u5247\u7528,\u56e0\u6df7\u96dc\u6a21\u5f0f\u53ef\u770b\u7db2\u8def\u4e0a\u6240\u6709\u8a0a\u6846,\u85c9\u7531\u770b\u539f\u59cb\u4f4d\u7f6e\u5f97\u77e5\u8cc7\u8a0a,\u70ba\u9006\u5411\u5b78\u7fd2<\/p>\n\n\n\n


\u5e38\u898b\u50b3\u8f38\u6a21\u5f0f\u5982\u4e0b\u8868 <\/p>\n\n\n\n

\u50b3\u8f38\u6a21\u5f0f<\/td>\u7c21\u4ecb<\/td>\u8aaa\u660e<\/td>switc type<\/td><\/tr>
cut-through\/Fast Forward<\/td>\u901f\u5ea6\u6700\u5feb
\u5ef6\u9072\u6700\u77ed
\u7121\u932f\u8aa4\u6aa2\u67e5<\/td>		latency fixes(\u5ef6\u9072\u56fa\u5b9a),\u53ea\u8981\u8b80\u5230frame\u76ee\u5730\u4f4d\u5740\u5c31\u958b\u59cb\u8f49\u9001
\u767c\u751f\u932f\u8aa4\u6a5f\u7387\u8f03\u5927<\/td>		symmetric<\/td><\/tr>
fragment-free<\/td>\u901f\u5ea6\u5feb
\u5ef6\u9072\u77ed
\u6aa2\u67e564byte<\/td>		cutthrough\u6539\u826f,Cisco\u5c08\u6709\u6280\u8853
latency fixes(\u5ef6\u9072\u56fa\u5b9a),\u6703\u6aa2\u67e5\u524d64\u500bbyte\u4ee5\u5224\u65b7\u662f\u5426\u78b0\u649e
\u82e5\u975e\u78b0\u649e\u7247\u6bb5\u624d\u8f49\u9001
ps:\u767c\u751f\u78b0\u649e\u6642,\u901a\u5e38\u90fd\u662f\u767c\u751f\u5728\u524d64byte<\/td>		symmetric<\/td><\/tr>
adaptive cut-through<\/td> <\/td>\u53ef\u4f9d\u932f\u8aa4\u91cf\u81ea\u52d5\u8abf\u6574\u50b3\u9001\u65b9\u5f0f,\u6703\u5148\u4f7f\u7528cut-through
\u82e5\u5075\u6e2c\u932f\u8aa4\u9054\u4e00\u5b9a\u9580\u6abb\u5247\u8b8a\u6210store & forward<\/td>		 <\/td><\/tr>
store & forward<\/td>\u901f\u5ea6\u6700\u6162
\u5ef6\u9072\u6700\u9577
\u6709\u932f\u8aa4\u6aa2\u67e5<\/td>		\u5148\u5132\u5b58\u8a0a\u6846\u4e26\u85c9\u7531crc\u932f\u8aa4\u6aa2\u67e5,\u63a5\u8457\u5728\u8f49\u9001
\u8b80\u53d6\u6574\u500b\u8a0a\u6846\u9700\u82b1\u8f03\u591a\u6642\u9593
\u82e5\u662f\u6709erroneous(\u932f\u8aa4\u7684)\u6216giant(\u904e\u5927\u7684)\u8a0a\u6846\u5247\u4e1f\u68c4
latency varies(\u5ef6\u9072\u4e0d\u56fa\u5b9a),\u56e0\u70ba\u6703\u6aa2\u67e5\u4e0d\u540c\u9577\u5ea6\u7684\u8a0a\u6846<\/td>		asymmetric<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

symmetric switch(\u5c0d\u7a31\u5f0f\u4ea4\u63db):<\/strong>
\u4f86\u6e90\u9023\u63a5port\u8207\u76ee\u5730\u9023\u63a5port\u96d9\u65b9\u9700\u4f7f\u7528\u76f8\u540c\u7684\u50b3\u8f38\u901f\u5ea6,\u4ee5\u7dad\u6301frame\u4e4b\u5b8c\u6574
\u82e5\u5169\u8005\u50b3\u8f38\u4e0d\u540c,\u5247frame\u5728\u4ee5\u5176\u4ed6\u901f\u7387\u50b3\u9001\u524d\u9700\u5148\u5132\u5b58\u5176\u4e2d\u4e00\u7a2e\u50b3\u8f38\u901f\u7387
asymmetric switch(\u975e\u5c0d\u7a31\u5f0f\u4ea4\u63db):<\/strong>
\u91dd\u5c0d\u4f7f\u7528\u4e0d\u540c\u983b\u5bec\u4e4b\u9023\u63a5port,\u63d0\u4f9b\u9023\u63a5port\u9593\u4ea4\u63db\u5f0f\u4e4b\u9023\u7dda ex:100mbps\u82071gbps\u6574\u5408\u74b0\u5883
\u91dd\u5c0d\u4e3b\u5f9e\u6a21\u5f0f\u74b0\u5883\u6240\u8a2d\u8a08\u7684\u6700\u4f73\u5316\u4ea4\u63db\u6a21\u5f0f,\u8b93\u591a\u5ba2\u6236\u7aef\u53ef\u540c\u6642\u8207\u4f3a\u670d\u5668\u901a\u8a0a<\/p>\n\n\n\n

……………..<\/p>\n\n\n\n

switch\u7b2c\u4e8c\u5c64\u4ea4\u63db\u6a5f\u5236 
<\/strong>\u4e3b\u8981\u7684\u4e09\u500b\u529f\u80fd
\u3000learning(\u5b78\u7fd2\u4f4d\u5740)<\/strong>:\u6703\u8a18\u4f4f\u4f86\u81ea\u5404\u754c\u9762\u7684\u8a0a\u6846\u786c\u9ad4\u4f4d\u7f6e,\u4e26\u5132\u5b58\u5728\u7279\u5b9a\u7684mac table\u4e2d
\u3000forwarding\/filtering(\u6c7a\u5b9a\u8f49\u9001\u6216\u904e\u6ffe)<\/strong>:\u6536\u5230\u8a0a\u6846\u6642\u4f9d\u786c\u9ad4\u4f4d\u5740\u53camac\u8868\u9001\u5230\u7279\u5b9a\u7684\u57e0\u51fa\u53bb
\u3000loop avoidance(\u907f\u514d\u8ff4\u5708)<\/strong>:\u82e5\u5728\u5be6\u9ad4\u4f48\u7dda\u5f62\u6210\u8ff4\u8def,\u53ef\u7528stp\u7522\u5728\u55ae\u4e00\u908f\u8f2f\u7dda\u8def\u907f\u514d\u8ff4\u5708
\u3000ps:learning\u901a\u5e38\u4f7f\u7528backward learning algorithm
\u7b2c\u4e8c\u5c64\u4ea4\u63db\u7db2\u8def\u7684\u512a\u9ede
\u3000\u6703increase(\u589e\u52a0) collision domain,\u56e0\u6b64reduce(\u6e1b\u5c11) collision<\/p>\n","protected":false},"excerpt":{"rendered":"

Port(\u57e0)\u7db2\u8def\u8a2d\u5099\u4e0a\u7528\u4f86\u63d2\u7db2\u8def\u7dda\u7684\u5b54  \u7db2\u8def\u8a2d …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[30],"tags":[],"class_list":["post-758","post","type-post","status-publish","format-standard","hentry","category-networkconcept"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/758","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/comments?post=758"}],"version-history":[{"count":0,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/posts\/758\/revisions"}],"wp:attachment":[{"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/media?parent=758"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/categories?post=758"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/systw.net\/note\/wp-json\/wp\/v2\/tags?post=758"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}