Refer to the exhibit. While troubleshooting an issue with a blocked switch port, you find this error in the switch log. Which action should you take first to locate the problem?
CHECK THE ATTACHED SWITCH FOR A BPDU FILTER.
TEST, THE LINK FOR UNIDIRECTIONAL FAILURES.
EXECUTE THE SHOW INTERFACE COMMAND TO CHECK FASTETHERNT 0/0
CHECK THE ATTACHED SWITCH FOR AN INTERFACE CONFIGURATION ISSUE
