# 802.1D - STP (Properties) [TOC] > 按:4I 講與 4J 講是一模一樣的影片。因此省略其中一個。 ## 課程影片 ### 第 4I 講 IEEE 802.1D 交換機的擴張樹演算法 (Spanning Tree Algorithm) L01 9 {%youtube ogHHcavflrI %}
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