Network AccessDifficulty 2/5
On which type of port should PortFast be enabled?
- AAccess ports connected to end hosts
- BRoot ports only
- CAll ports, to speed up convergence
- DTrunk ports to other switches
Show answer and rationale
Correct: A. PortFast moves an access port straight to forwarding, which is safe only where no switch (and thus no loop) can appear. Enabling it toward switches risks loops; BPDU Guard is usually paired with it.
- D — A trunk to a switch can create a loop during the forwarding delay.
- B — Root ports are determined by STP; PortFast is an admin setting for edge ports.
- C — Blanket enablement defeats loop prevention.