200-301 · Question #1275
Which port type supports the spanning-tree portfast command without additional configuration?
The correct answer is D. access ports. A port with the Port Fast feature enabled is moved directly to the spanning-tree forwarding state without waiting for the standard forward-time delay. Use Port Fast only when connecting a single end station to an access or trunk port. Enabling this feature on a port connected to
Question
Which port type supports the spanning-tree portfast command without additional configuration?
Options
- ALayer 3 main interfaces
- BLayer 3 subinterfaces
- Ctrunk ports
- Daccess ports
How the community answered
(41 responses)- A2% (1)
- B2% (1)
- D95% (39)
Explanation
A port with the Port Fast feature enabled is moved directly to the spanning-tree forwarding state without waiting for the standard forward-time delay. Use Port Fast only when connecting a single end station to an access or trunk port. Enabling this feature on a port connected to a switch or hub could prevent spanning tree from detecting and disabling loops in your network, which could cause broadcast storms and address-learning
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