Cisco 200-125 Exam

Which Cisco Catalyst feature automatically disables the port in an operational PortFast upon receipt of a BPDU?

  • A. BackboneFast
  • B. UplinkFast
  • C. Root Guard
  • D. BPDU Guard
  • E. BPDU Filter
Answer: Option D.
Explanation: 

We only enable PortFast feature on access ports (ports connected to end stations). But if someone does not know he can accidentally plug that port to another switch and a loop may occur when BPDUs are being transmitted and received on these ports. With BPDU Guard, when a PortFast receives a BPDU, it will be shut down to prevent a loop.

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