200-301 · Question #306
Which state does the switch port move to when PortFast is enabled?
The correct answer is B. forwarding. When PortFast is enabled on a switch port, it bypasses the normal STP listening, learning, and blocking states, transitioning directly to the forwarding state.
Question
Which state does the switch port move to when PortFast is enabled?
Options
- Alearning
- Bforwarding
- Cblocking
- Dlistening
How the community answered
(31 responses)- A3% (1)
- B90% (28)
- C6% (2)
Why each option
When PortFast is enabled on a switch port, it bypasses the normal STP listening, learning, and blocking states, transitioning directly to the forwarding state.
The learning state is skipped when PortFast is enabled, as the port does not need to learn MAC addresses before forwarding.
PortFast immediately transitions a port into the forwarding state, bypassing the Listening, Learning, and Blocking states of Spanning Tree Protocol (STP), which significantly reduces the time it takes for an end device to gain network connectivity.
The blocking state is skipped when PortFast is enabled; otherwise, the port would initially block traffic.
The listening state is skipped when PortFast is enabled, as the port does not need to listen for BPDUs before transitioning.
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_cg/swstp.html
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