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2017å¹´8æœˆ25æ—¥ã€NTTã‚³ãƒŸãƒ¥ãƒ‹ã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‚ºï¼ˆNTTã‚³ãƒ ï¼‰ã®ã‚¤ãƒ³ã‚¿ãƒ¼ãƒãƒƒãƒˆæŽ¥ç¶šã‚µãƒ¼ãƒ“ã‚¹ã€ŒOCNã€ã§ç™ºç”Ÿã—ãŸé€šä¿¡éšœå®³ã«é–¢ã—ã¦ã€ã‚¤ãƒ³ã‚¿ãƒ¼ãƒãƒƒãƒˆé€šä¿¡é–¢é€£ã®è˜è€…ã¯èª¤ã£ãŸçµŒè·¯æƒ…å ±ãŒå¤§é‡ã«æµã‚ŒãŸã“ã¨ãŒåŽŸå› ã§ã¯ãªã„ã‹ã¨ã®è¦‹æ–¹ã‚’ç¤ºã—ãŸã€‚ã“ã“ã§ã„ã†çµŒè·¯æƒ…å ±ã¯ãƒ«ãƒ¼ã‚¿ãƒ¼ãŒBGPï¼ˆBorder Gateway Protocolï¼‰ã¨ã„ã†ãƒ—ãƒãƒˆã‚³ãƒ«ã‚’ä½¿ã£ã¦äº¤æ›ã™ã‚‹ã‚‚ã®ã ã€‚ æ—¥æœ¬ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã‚¤ãƒ³ãƒ•ã‚©ãƒ¡ãƒ¼ã‚·ãƒ§ãƒ³ã‚»ãƒ³ã‚¿ãƒ¼ï¼ˆJPNICï¼‰ã®å²¡ç”°é›…ä¹‹æ°ã¯ã€NTTã‚³ãƒ ã¯è¤‡æ•°ã®çµ„ç¹”ã¨å¯¾ç‰ãªé–¢ä¿‚ã§ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®çµŒè·¯æƒ…å ±ã‚’ã‚„ã‚Šå–ã‚Šã—ã¦ã„ã‚‹ãŒï¼ˆã“ã‚Œã‚’ã€Œãƒ”ã‚¢ãƒªãƒ³ã‚°ã€ã¨ã„ã†ï¼‰ã€ãã®ã†ã¡ã®ã‚ã‚‹çµ„ç¹”ãŒèª¤ã£ãŸçµŒè·¯æƒ…å ±ã‚’å¤§é‡ã«æµã—ãŸã®ã§ã¯ãªã„ã‹ã¨è©±ã™ã€‚ãã®çµæžœã€ã€ŒNTTã‚³ãƒ ã‚’ä»‹ã—ã¦ã‚¤ãƒ³ã‚¿ãƒ¼ãƒãƒƒãƒˆã«æŽ¥ç¶šã—ã¦ã„ãŸä¼æ¥ã®ãƒ«ãƒ¼ã‚¿ãƒ¼ãŒã€å¤§é‡ã®çµŒè·¯æƒ…å ±ã‚’å—ã‘å–ã‚Šé«˜ã„è² è·ãŒã‹ã‹ã‚Šã€ä¸€éƒ¨ã¯ãƒ•ãƒªãƒ¼ã‚ºã—ãŸã‚ˆã†ãªçŠ¶æ…‹ã«é™¥ã‚‹ãªã©ã—ã¦é€šä¿¡éšœå®³ã«ã¤ãªãŒã£ãŸã®ã§ã¯ãªã„ã‹ã€ï¼ˆå²¡
AKANE_Daigo 2017/08/25
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The future of computing
The future of computingThe era of predictable improvement in computer hardware is ending. What comes next? IN 1971 the fastest car in the world was the Ferrari Daytona, capable of 280kph (174mph). The worldâ€™s tallest buildings were New Yorkâ€™s twin towers, at 415 metres (1,362 feet). In November that year Intel launched the first commercial microprocessor chip, the 4004, containing 2,300 tiny trans
AKANE_Daigo 2016/03/13
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Border Gateway Protocol - Wikipedia
Border Gateway Protocolï¼ˆãƒœãƒ¼ãƒ€ãƒ¼ãƒ»ã‚²ãƒ¼ãƒˆã‚¦ã‚§ã‚¤ãƒ»ãƒ—ãƒãƒˆã‚³ãƒ«ã€ç•¥ç§°Â : BGPï¼‰ã¯è‡ªå¾‹ã‚·ã‚¹ãƒ†ãƒ ï¼ˆASï¼‰é–“ã§çµŒè·¯æƒ…å ±ã‚’äº¤æ›ã™ã‚‹ãŸã‚ã«è¨è¨ˆã•ã‚ŒãŸãƒ«ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ãƒ—ãƒãƒˆã‚³ãƒ«ã§ã‚ã‚‹ã€‚åºƒç¾©ã®Exterior Gateway Protocolï¼ˆEGPï¼‰ã§ã‚ã‚Šã€ã‚¤ãƒ³ã‚¿ãƒ¼ãƒãƒƒãƒˆã§ã¯ã‚¤ãƒ³ã‚¿ãƒ¼ãƒãƒƒãƒˆãƒ»ã‚µãƒ¼ãƒ“ã‚¹ãƒ»ãƒ—ãƒãƒã‚¤ãƒ€ï¼ˆISPï¼‰ã‚„å·¨å¤§ãªãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã®ç›¸äº’æŽ¥ç¶šã§æ¨™æº–çš„ãªãƒ«ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ãƒ—ãƒãƒˆã‚³ãƒ«ã¨ã—ã¦åˆ©ç”¨ã•ã‚Œã¦ã„ã‚‹ã€‚ è‡ªå¾‹ã‚·ã‚¹ãƒ†ãƒ ï¼ˆASï¼‰é–“ã®ãƒ«ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ã‚’è¡Œã†Exterior Gateway Protocolï¼ˆEGPï¼‰ã®é€šä¿¡ãƒ—ãƒãƒˆã‚³ãƒ«ã§ã‚ã‚‹ã€‚ BGPã¯IPãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã‹è‡ªå¾‹ã‚·ã‚¹ãƒ†ãƒ ï¼ˆASï¼‰é–“ã®åˆ°é”æ€§ã‚’ç¤ºã™ãƒ—ãƒ¬ãƒ•ã‚£ãƒƒã‚¯ã‚¹ï¼ˆprefixï¼‰ã®ãƒ«ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ãƒ†ãƒ¼ãƒ–ãƒ«ã‚’ç¶æŒã™ã‚‹ã“ã¨ã§ãƒ«ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ã‚’è¡Œã†ã€‚BGPã¯ãƒ‘ã‚¹ãƒ™ã‚¯ãƒˆãƒ«åž‹ãƒ«ãƒ¼ãƒ†ã‚£ãƒ³ã‚°ãƒ—ãƒãƒˆã‚³ãƒ«ï¼ˆè‹±èªžç‰ˆï¼‰ã«åˆ†é¡žã•ã‚Œã€æŠ€è¡“çš„ãªãƒ¡ãƒˆãƒªãƒƒã‚¯ã¯ä½¿ç”¨ã—ãªã„ãŒã€ãƒãƒƒãƒˆ
AKANE_Daigo 2010/10/10
BGP - Border Gateway Protocol: ã“ã‚“ãªã‚“ã¯ã¾ã£ãŸãæœªçŸ¥ã®é ˜åŸŸã ãªã€‚

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ã‚¹ãƒ‘ãƒ‹ãƒ³ã‚°ãƒ„ãƒªãƒ¼ãƒ—ãƒãƒˆã‚³ãƒ« - Wikipedia
ã‚¹ãƒ‘ãƒ‹ãƒ³ã‚°ãƒ„ãƒªãƒ¼ãƒ—ãƒãƒˆã‚³ãƒ«ï¼ˆè‹±èªž: spanning tree protocolã€STPï¼‰ã¯ã€LANå†…ã§ãƒ«ãƒ¼ãƒ—æ§‹æˆã‚’å›žé¿ã™ã‚‹ãŸã‚ã®ãƒ‡ãƒ¼ã‚¿ãƒªãƒ³ã‚¯å±¤ã®é€šä¿¡ãƒ—ãƒãƒˆã‚³ãƒ«ã§ã‚ã‚‹ã€‚IEEE 802.1Dã§å®šç¾©ã€ãŠã‚ˆã³è¦æ ¼åŒ–ã•ã‚Œã¦ã„ã‚‹ã€‚ æœ¬ãƒ—ãƒãƒˆã‚³ãƒ«ã¯DECã§åƒã„ã¦ã„ãŸãƒ©ãƒ‡ã‚£ã‚¢ãƒ»ãƒ‘ãƒ¼ãƒ«ãƒžãƒ³ã«ã‚ˆã£ã¦ç™ºæ˜Žã•ã‚ŒãŸã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ã‚’åŸºç¤Žã¨ã—ã¦ã„ã‚‹ã€‚LANã‚’ç‚¹ã¨ç·šã«ã‚ˆã£ã¦æ§‹æˆã•ã‚Œã‚‹ã‚°ãƒ©ãƒ•ã¨ã¿ãªã—ã€LANæŽ¥ç¶šã®ä¸€éƒ¨ã‚’ã‚ãˆã¦åˆ©ç”¨ç¦æ¢ã¨ã™ã‚‹ã“ã¨ã§ã‚¹ãƒ‘ãƒ‹ãƒ³ã‚°æœ¨ã‚’æ§‹æˆã™ã‚‹ã€‚ã™ã‚‹ã¨ã€æœ¨æ§‹é€ ã¯ãƒ«ãƒ¼ãƒ—ï¼ˆé–‰è·¯ï¼‰ã‚’æŒãŸãªã„ã“ã¨ã‹ã‚‰ã€LANå†…éƒ¨ã§ã®ãƒ«ãƒ¼ãƒ—ãŒå›žé¿ã•ã‚ŒãŸã“ã¨ã«ãªã‚‹ã€‚ STPã®æ¨™æº–ã«ã¯IEEEã¨DECãŒåˆ¶å®šã—ãŸ2ã¤ã®ç•°ãªã‚‹è¦æ ¼ãŒå˜åœ¨ã™ã‚‹ãŒã€ã‚³ãƒ³ãƒ”ãƒ¥ãƒ¼ã‚¿ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ã«ãŠã„ã¦ä¸€èˆ¬çš„ã«åˆ©ç”¨ã•ã‚Œã‚‹ã®ã¯IEEEã®ã‚‚ã®ã§ã‚ã‚‹ã€‚ã“ã‚Œã‚‰ã®é–“ã«äº’æ›æ€§ã¯ãªãã€ä¸¡æ–¹ã®STPã‚’åŒæ™‚ã«é‹ç”¨ã—ãŸå ´åˆã¯æ£å¸¸ã«å‹•ä½œã—ãªã„ã€‚ æœ¬ãƒ—ãƒãƒˆã‚³ãƒ«ã®æœ¬è³ªçš„ãªå¿…è¦æ€§ã¯ã€LA
AKANE_Daigo 2010/10/10
Spanning Tree Protocol: ãƒ«ãƒ¼ãƒ—å›žé¿ã®ãŸã‚ã®ãƒ—ãƒãƒˆã‚³ãƒ«ã€‚IEEE802.1dã§å®šç¾©

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ã€ŒAuto MDI/MDI-Xã€ã¨ã¯ï¼šITpro
AKANE_Daigo 2010/10/10
Auto MDI/MDI-X: ã‚¤ãƒ¼ã‚µãƒãƒƒãƒˆã‚±ãƒ¼ãƒ–ãƒ«ãŒã‚¯ãƒã‚¹ã‹ã‚¹ãƒˆãƒ¬ãƒ¼ãƒˆã‹ã‚’è‡ªå‹•åˆ¤åˆ¥ã™ã‚‹ã‚¹ã‚¤ãƒƒãƒãƒ³ã‚°ãƒãƒ–ã®æ©Ÿèƒ½

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UTPã‚±ãƒ¼ãƒ–ãƒ«ã¨ã¯ - ITç”¨èªžè¾žå…¸
æ¦‚è¦ UTPã‚±ãƒ¼ãƒ–ãƒ«ï¼ˆUnshielded Twisted Pair cableï¼‰ã¨ã¯ã€æ’šã‚Šåˆã‚ã›ãŸä¸€å¯¾ã®é‡‘å±žç·šã«ã‚ˆã‚Šé›»æ°—ä¿¡å·ã‚„é›»åŠ›ã‚’ä¼ãˆã‚‹é€šä¿¡ç”¨ã‚±ãƒ¼ãƒ–ãƒ«ã®æ§‹é€ ã®ä¸€ã¤ã§ã€é›»ç£ãƒŽã‚¤ã‚ºã‚’é®æ–ã™ã‚‹ã‚·ãƒ¼ãƒ«ãƒ‰åŠ å·¥ã‚’è¡Œã£ã¦ã„ãªã„ã‚‚ã®ã€‚é›»è©±å›žç·šã‚„ã‚³ãƒ³ãƒ”ãƒ¥ãƒ¼ã‚¿ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ç”¨ã®é€šä¿¡ã‚±ãƒ¼ãƒ–ãƒ«ã¨ã—ã¦æœ€ã‚‚åºƒãæ™®åŠã—ã¦ã„ã‚‹ã€‚ ã€Œãƒ„ã‚¤ã‚¹ãƒˆãƒšã‚¢ã‚±ãƒ¼ãƒ–ãƒ«ã€ï¼ˆtwisted pair cableï¼šã‚ˆã‚Šå¯¾ç·šï¼‰ã¨å‘¼ã°ã‚Œã‚‹ã‚±ãƒ¼ãƒ–ãƒ«ã®ä¸€ç¨®ã§ã€çµ¶ç¸ã•ã‚ŒãŸäºŒæœ¬ã®éŠ…ã®ç·šæã‚’æ’šã‚Šåˆã‚ã›ãŸã‚‚ã®ã‚’ä½•å¯¾ã‹æŸãã¦ä¸€æœ¬ã®ã‚±ãƒ¼ãƒ–ãƒ«ã¨ã—ã¦ã„ã‚‹ã€‚ã‚ˆãä½¿ã‚ã‚Œã‚‹ã®ã¯2å¯¾4æœ¬ã‚’æŸããŸ4ç·šå¼ï¼ˆ4èŠ¯å¼ï¼‰ã¨4å¯¾8æœ¬ã‚’æŸããŸ8ç·šå¼ï¼ˆ8èŠ¯å¼ï¼‰ã§ã‚ã‚‹ã€‚ UTPã‚±ãƒ¼ãƒ–ãƒ«ã¯ã‚ˆã‚Šå¯¾ç·šã®ä¸ã§æœ€ã‚‚ç°¡æ˜“ãªæ§‹é€ ã®ã‚±ãƒ¼ãƒ–ãƒ«ã§ã€å„å¯¾ã‚ã‚‹ã„ã¯æœ€å¤–å‘¨ã«é‡‘å±žãƒ¡ãƒƒã‚·ãƒ¥ã‚„ãƒ›ã‚¤ãƒ«ãªã©ã®ã‚·ãƒ¼ãƒ«ãƒ‰ã‚’æ–½ã•ãšã€çµ¶ç¸ä½“ã®æŸ”ã‚‰ã‹ã„åˆæˆæ¨¹è„‚ãªã©ã§ã§ããŸè¢«è¦†ï¼ˆã‚·ãƒ¼ã‚¹ï¼‰ã®ã¿ã§å¤–ç•Œã¨éš”ã¦ã‚‰ã‚Œã¦ã„ã‚‹ã€‚ ã‚«ãƒ†ã‚´ãƒª æœ€å¤§å‘¨æ³¢æ•°
AKANE_Daigo 2010/10/10
UTP - Unshielded Twist Pair cable éžã‚·ãƒ¼ãƒ«ãƒ‰ã‚ˆã‚Šå¯¾ç·šã€‚ãªã‚“ã®ã“ã¨ã¯ãªã„æ™®æ®µä½¿ã£ã¦ã‚‹Ethernetã‚±ãƒ¼ãƒ–ãƒ«ã¯ã“ã‚Œãªã‚“ã ãªã€‚

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