多项选择题
Which of the following are spanning tree port states?（）
A. Learning B. Spanning C. Listening D. Forwarding E. Initializing F. Filtering G. Permitting
多项选择题 Which two of the following values does STP take into consideration when it elects the root bridge?（）
单项选择题 What is the purpose of the spanning-tree algorithm in a switched LAN?（）
单项选择题 By default, which of the following factors determines the spanning-tree path cost?（）
