单选题A user plugged a cable between two network jacks that attach to the same switch and caused a broadcast storm. Which of the following would have prevented the broadcast storm?（）A Spanning treeB VLAN taggingC 802.1xD Port mirroring
题目
单选题
A user plugged a cable between two network jacks that attach to the same switch and caused a broadcast storm. Which of the following would have prevented the broadcast storm?（）
A
Spanning tree
B
VLAN tagging
C
802.1x
D
Port mirroring