diff --git a/notes/计算机网络.md b/notes/计算机网络.md
index 54234f80..5618f765 100644
--- a/notes/计算机网络.md
+++ b/notes/计算机网络.md
@@ -72,7 +72,7 @@
 
 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
diff --git a/pics/Technology-ComputerNetworking-Internet-ISPs.png b/pics/Technology-ComputerNetworking-Internet-ISPs.png
new file mode 100644
index 00000000..72a30a7b
Binary files /dev/null and b/pics/Technology-ComputerNetworking-Internet-ISPs.png differ