| Exam 400-101 | Question id=153 | Layer 2 Technologies |
Which statement about the spanning-tree portfast feature on the switch is true?
| A. |
If an interface is enabled for portfast receives BPDU, the port goes through the spanning-tree listening, learning and forwarding states. | |
| B. |
If an interface is enabled for portfast receives BPDU, the port does not go through the spanning-tree listening, learning, and forwarding states. | |
| C. |
If an interface is enabled for portfast receives BPDU, the port is shut down immediately. | |
| D. |
If an interface is enabled for portfast receives BPDU, the port goes into the spanning-tree inconsistent state. |
PortFast causes a switch or trunk port to enter the spanning tree forwarding state immediately, bypassing the listening and learning states.
Once a portfast port receives a BPDU, it is supposed to lose portfast status and go back through the listening/learning phases at which point it is not forwarding traffic.