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.
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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.



05.12.2016 10:30, wayyeegetahun2:

hich statement about the spanning-tree portfast feature on the switch is true?
A. If an interface is enabled for portfast receives BPDU, the port is shut down immediately.

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 goes into the spanning-tree inconsistent state.

D. If an interface is enabled for portfast receives BPDU, the port goes through the spanning-tree listening, learning and forwarding states.
14.03.2017 16:19, sazan:

the answer is wrong: If an interface is enabled for portfast receives BPDU, the port goes through the spanning-tree listening, learning and forwarding states.

If portfast is enabled, the port doesnt go through the stp states it imidiatly goes in forwarding state which is used on ports where end devices are connected.

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