An edge port can be configured as “portfast” as follows:
S1(config)# interface FastEthernet 0/1
spanning-tree portfast
!
Configuring a trunk port with “portfast” requires the following command:
S1(config)# interface FastEthernet 0/1
spanning-tree portfast trunk
!
Everyone in the comments are talking about where to "use" portfast and where to not... The question is not asking you should or not... It asks which one supports "without additional configuration" .
"By default, PortFast is disabled on all switch ports. You can configure PortFast as a global default, affecting all switch ports with a single command. All ports that are configured for access mode (nontrunking) will have PortFast automatically enabled."
ter the STP forwarding-state immediately or upon a linkup event, thus bypassing the listening and learning states. The PortFast feature is enabled at a port level, and this port can either be a physical or a logical port. When PortFast feature is enabled on a switch or a trunk port, the port immediately transitions to the STP forwarding state.
Though PortFast is enabled the port still participates in STP. If the port happens to be part of topology that could form a loop, the port eventually transitions into STP blocking mode
That is because you should only use port fast command on access ports. If you used it on a trunk port it could cause issues with spanning tree since it skips the listening and learning stages.
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