200-301 · Question #25
Which result occurs when PortFast is enabled on an interface that is connected to another switch?
The correct answer is A. Spanning tree may fail to detect a switching loop in the network that causes broadcast storms. 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
Question
Which result occurs when PortFast is enabled on an interface that is connected to another switch?
Options
- ASpanning tree may fail to detect a switching loop in the network that causes broadcast storms
- BVTP is allowed to propagate VLAN configuration information from switch to switch automatically.
- CRoot port choice and spanning tree recalculation are accelerated when a switch link goes down
- DAfter spanning tree converges PortFast shuts down any port that receives BPDUs.
How the community answered
(31 responses)- A90% (28)
- B6% (2)
- C3% (1)
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
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