LearningJavaPython
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 互联网交换点 IXP 允许两个 ISP 直接相连而不用经过第三个 ISP。
 
-![undefined](index_files/Technology-ComputerNetworking-Internet-ISPs.png "undefined")
+<div align="center"> <img src="../pics//Technology-ComputerNetworking-Internet-ISPs.png"/> </div><br>
 
 
 ## 主机之间的通信方式