2因特网 23因特网交换点( Internet eXchange Point,ⅨXP) ahttp:/en.wikipedia.org/wiki/nternetexchangepoint o An Internet exchange point (X or IXP)is a physical infrastructure through which Internet service providers(IsPs) exchange Internet traffic between their networks(autonomous systems) a IXPs reduce the portion of an ISP's traffic which must be delivered via their upstream transit providers thereby reducing the average per-bit delivery cost of their service. Furthermore the increased number of paths learned through the IXP improves routing efficiency and fault-tolerance 河南中医学院/阮晓龙/13938213680/htt/ke.5 1xueweb.cn河南中医学院 / 阮晓龙 / 13938213680 / http://ke.51xueweb.cn 2.因特网  http://en.wikipedia.org/wiki/Internet_exchange_point  An Internet exchange point (IX or IXP) is a physical infrastructure through which Internet service providers (ISPs) exchange Internet traffic between their networks (autonomous systems).  IXPs reduce the portion of an ISP's traffic which must be delivered via their upstream transit providers, thereby reducing the average per-bit delivery cost of their service. Furthermore, the increased number of paths learned through the IXP improves routing efficiency and fault-tolerance. 17 2.3因特网交换点（Internet eXchange Point，IXP）