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

Which result occurs when PortFast is enabled on an interface that is connected to another switch?
A . Spanning tree may fail to detect a switching loop in the network that causes broadcast storms.
B . VTP is allowed to propagate VLAN configuration information from switch to switch automatically.
C . Root port choice and spanning tree recalculation are accelerated when a switch link goes down.
D . After spanning tree converges PortFast shuts down any port that receives BPDU

View Answer

Answer: A

Explanation:

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"