Which result occurs when PortFast is enabled on an interface that is connected to another switch?

By | November 19, 2022

  • A. Root port choice and spanning tree recalculation are accelerated when a switch link goes down.
  • B. After spanning tree converges, PortFast shuts down any port that receives BPDUs.
  • C. VTP is allowed to propagate VLAN configuration information from switch to switch automatically.
  • D. Spanning tree may fail to detect a switching loop in the network that causes broadcast storms.
Answer: Option D.
Explanation: 

Section: Network Access
Enabling the PortFast feature causes a switch or a trunk port to enter the STP forwarding-state immediately or upon a linkup event, thus bypassing the listening and learning states.
Note: To enable portfast on a trunk port you need the trunk keyword “spanning-tree portfast trunk”.

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