If a switch port goes directly into a blocked state only when a superior BPDU is received, what mechanism must be in use?
A. STP BPDU guard
B. loop guard
C. STP Root guard
D. EtherChannel guard
Answer:C
If a switch port goes directly into a blocked state only when a superior BPDU is received, what mechanism must be in use?
A. STP BPDU guard B. loop guard C. STP Root guard D. EtherChannel guard