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200-301 · Question #719

When you enable PortFast on a switch port, the port immediately transitions to which state?

The correct answer is B. Forwarding. Enabling PortFast on a switch port causes it to bypass the normal Spanning Tree Protocol (STP) listening and learning states and transition directly to the forwarding state.

Submitted by fernanda_arg· Mar 5, 2026Network Access

Question

When you enable PortFast on a switch port, the port immediately transitions to which state?

Options

  • ABlocking
  • BForwarding
  • CLearning
  • DListening

How the community answered

(54 responses)
  • A
    7% (4)
  • B
    87% (47)
  • C
    2% (1)
  • D
    4% (2)

Why each option

Enabling PortFast on a switch port causes it to bypass the normal Spanning Tree Protocol (STP) listening and learning states and transition directly to the forwarding state.

ABlocking

Blocking is an STP state where the port does not forward frames but listens for BPDUs, which PortFast aims to bypass.

BForwardingCorrect

PortFast immediately transitions a switch port to the forwarding state, skipping the listening and learning states, which reduces the time it takes for a device to gain network access.

CLearning

Learning is an STP state where the port learns MAC addresses but does not forward frames, a state PortFast is designed to skip.

DListening

Listening is an STP state where the port listens for BPDUs but does not learn MAC addresses or forward frames, which PortFast also bypasses.

Concept tested: STP PortFast operation

Source: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12_2_55_se/configuration/guide/3750x_3560x_cg/swstp.html

Topics

#PortFast#Spanning Tree Protocol#STP port states#switch port

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