If a switch receives a superior BPDU and goes directly into a blocked state, what mechanism must be in use?
A. root guard
B. EtherChannel guard
C. loop guard
D. BPDU guard
Answer:A
If a switch receives a superior BPDU and goes directly into a blocked state, what mechanism must be in use?
A. root guard B. EtherChannel guard C. loop guard D. BPDU guard