What STP feature causes an interface to be placed in the forwarding state as soon as the interface is physically active?
- STP
- EtherChannel
- Root Guard
- PortFast
Explanation: The PortFast feature allows STP to move a port from blocking to forwarding without going through the interim listening and learning states. STP allows this exception when the link is known to have no switch on the other end of the link, removing the risk of a switching loop. BPDU Guard is a common feature to use at the same time as PortFast because it watches for incoming bridge protocol data units (BPDU), which should not happen on an access port, and prevents the loops from a rogue switch by disabling the port.
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