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20 2.因特网 23因特网交换点( nternet eXchange Point,|XP) Tier 1 Networks Tier 2 Networks IXP Tier 2 ISP POP #2 POP #1 菌 Transit Tier 3 Network Tier 3 Network (multi-homed ISP) (single homed ISP Internet users (business, consumers, etc) 河南中医药大学/阮晓龙713938213680/http://network.xg.hactcm.edu.cn
河南中医药大学 / 阮晓龙 / 13938213680 / http://network.xg.hactcm.edu.cn 2.因特网 20 2.3因特网交换点（Internet eXchange Point，IXP）