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+# 概述习题
+
diff --git a/Computer-Network/0-summary.md b/Computer-Network/0-summary.md
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@@ -170,5 +170,3 @@ RTT=往返传播时延+末端处理时延。
 ### 五层参考模型
 
 应用层、传输层、网络层、数据链路层、物理层。
-
-## 习题