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thumb A tier 2 network is an Internet service provider who engages in the practice of peering with other networks, but who also purchases IP transit to reach some portion of the Internet. Tier 2 providers are the most common Internet service providers as it is much easier to purchase transit from a Tier 1 network than it is to peer with them and attempt becoming a tier 1 carrier. The term tier 3 is sometimes also used to describe networks who solely purchase IP transit from other networks to reach the Internet. ==List of large or important tier 2 networks== * Hurricane Electric/AS6939 (buys IPv4 transit from TeliaSonera International Carrier/AS1299) * (Easynet ) AS4589 (buys transit including NTT Communications Corp/AS2914, PCCW Global/AS3491, GTT/AS3257 and Interoute/AS8928) * (Finger Lakes Technologies Group, Inc. ) AS14477 (buys transit from Level3/AS3356, GBLX/AS3549 and Cogent/AS174) * (Atrato IP Networks ) AS5580 (buys transit from NTT Communications Corp/AS2914, Level3/AS3356, and TeliaSonera International Carrier/AS1299) * British Telecom/AS5400 (buys transit from NTT Communications Corp/AS2914 and Level 3/AS3356) * WarwickNet AS48961 (buys transit from NTT Communications Corp/AS2914, Level3/AS3356, GTT/AS3257) * (Kaia Global Networks ) AS251 (buys transit from Sprint Corporation/AS1239) * KCOM Group/AS12390 (buys transit from KPN/AS286 and Level 3/AS3356) * Cable and Wireless AS1273 (buys transit from Level3/AS3356 and TeliaSonera International Carrier/AS1299) * Vodafone AS3209 (formerly ARCOR AG Germany) (buys transit from Level3/AS3356, GBLX/AS3549, TeliaSonera International Carrier/AS1299, and Interoute/AS8928) * Virgin Media/ Virgin Media Business AS5089 (buys transit from Level3/AS3356, GBLX/AS3549, gtt/AS3257, AboveNet/AS6461, and Cable and Wireless/AS1273) * PCCW Global AS3491 (buys transit from GBLX/AS3549, Tata Communications/AS6453, and Verizon/AS701) * Swiftway AS35017 (buys transit from NTT Communications Corp/AS2914], GBLX/AS3549], and Cogent/AS174)〔(Peering Database August 2013 )〕 * Tele2 (formerly SWIPNet) AS1257 (buys transit from Sprint Nextel/AS1239) * tw telecomAS4323 (buys transit from Sprint Nextel/AS1239) * (FiberRing ) AS38930 (buys transit from NTT Communications Corp/AS2914, Level3/AS3356, TeliaSonera International Carrier/AS1299), Tata Communications/AS6453, and Cogent/AS174) * Internap AS14744 and others (buys transits from multiple Tier 1 Networks) * Interoute AS8928 (buys transit from NTT Communications Corp/AS2914 and GTT/AS3257) * Global Telecom & Technology AS25973 (buys transit from Level3/AS3356 and GBLX/AS3549) * Comcast AS7922 (buys transit from Tata Communications/AS6453) * Sling Broadband AS33724 (buys transit from Level3/AS3356) and Cogent/AS174) * Spirit Communications AS2711 (buys transit from GBLX/AS3549 and GTT/AS3257) * Stealth Communications AS8002 (buys transit from Level3/AS3356, GBLX/AS3549, GTT/AS3257, Sprint Nextel/AS1239, Verizon/AS701) * (ZEROFAIL ) AS40191 (buys transit from GTT/AS3257, Hurricane Electric/AS6939, Cogent/AS174) * (Fibrenoire ) AS22652 (buys transit from Level3/AS3356, Tata Communications/AS6453, GTT/AS3257) * (Telkom Indonesia International ) AS7713 (buys transit from Level3/AS3356, Tata Communications/AS6453) * (PT Mora Telematika Indonesia ) AS23947 (buys transit from NTT America/AS2914, Tata Communications/AS6453) * Zayo Group AS6461 Formerly AboveNet (buys transits from multiple Tier 1 Networks) The ASxxx refer to each network's IANA-assigned AS number. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tier 2 network」の詳細全文を読む スポンサード リンク
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