Which Cisco IOS debug command is used to display log messages whenever STP performs changes to an interface's role or state?
A) debug spanning-tree
B) debug spanning-tree interface activity
C) debug spanning-tree events
D) debug spanning-tree state
C
Explanation: C) The debug spanning-tree events Cisco IOS debug command is used to initiate the display of log messages when STP changes the state or role of an interface.
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