200-301: Cisco Certified Network AssociateDemo

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QuestionQ231

Security Fundamentals

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Refer to the exhibit. What happens if Gig1/11 receives an STP BPDU?

  • A The port transitions to STP blocking.
  • B The port immediately transitions to STP forwarding.
  • C The port goes into error-disable state.
  • D The port transitions to the root port.
Explanation

A PortFast access interface with BPDU Guard enabled is not allowed to receive BPDUs. If a BPDU is received on that port, BPDU Guard disables the interface by placing it into the err-disabled state, which is the Cisco protection mechanism used to prevent unintended Layer 2 topology changes or loops.

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