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The access switchport of a Switch in an STP domain is transitioning without learning and listening states. Which two commands could be used to remove configuration causing this behavior? (Choose Two)
spanning-tree portfast bpduguard
no spanning-tree bpduguard
spanning-tree bpduguard portfast
spanning-tree portfast disable
no spanning-tree portfast
PortFast feature shortens the Listening and Learning state, making a port into forwarding state much faster than usual. The command "no spanning-tree portfast" implicitly enables PortFast if global configuration mode contains "spanning-tree portfast default" command and the port is not a trunk port. The "spanning-tree portfast disable" command explicitly disables Portfast for the given interface. By default Portfast BPDU guard is disabled; however, "spanning-tree portfast bpduguard" disables the port. For more information refer to: http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/28943-170.html and/or https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4000/8-2glx/configuration/guide/stp_enha.html#wp1047408
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