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If a switch port goes directly into a blocked state only when a superior BPDU is received, what mechanism must be in use?
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: A
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C. STP Root guard is the correct answer.
Root guard feature is to protect any Root Bridge when another switch advertises a superior BPDU.
BPDU guard feature further protects the integrity of switch ports that have PortFast enabled.