Exam 210-260 Question id=664 Secure Routing and Switching

If a switch receives a superior BPDU and goes directly into a blocked state, what mechanism must be in use?

A. portfast
B. EtherChannel guard
C. loop guard
D. BPDU guard


the answers are mixed, do not specify in the comment number or the letter of the answer
please write answer#A instead A, answer#B instead B...

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