To enable portfast on all access ports, which command should be used?

To enable PortFast on all access ports, the command "spanning-tree portfast default" is used. This command changes the global Spanning Tree Protocol (STP) configuration to enable PortFast on all access ports, which are ports configured in access mode.

PortFast is a feature that allows a port to transition immediately from the blocking state to the forwarding state, bypassing the usual STP listening and learning states. This is particularly useful for access ports connected to devices like computers and printers, where you want them to start communicating on the network as quickly as possible.

Using the specific command "spanning-tree portfast default" ensures that every access port on the switch will inherit this behavior, streamlining the configuration of multiple access ports at once without needing to configure PortFast on each individual port. This command effectively optimizes the network's response times when devices are connected or disconnected.