You receive a call that when computers boot up, they display an error message stating that they cannot reach a domain controller. However, after a few tries, the problem goes away, and the domain controller can be reached. Which command would you enter into the interface if you suspect spanning-tree convergence problems?

A. SwitchA(config-if)# no switchport spanning-tree
B. SwitchA(config)# switchport spanning-tree portfast
C. SwitchA(config)# spanning-tree portfast default
D. SwitchA(config-if)# spanning-tree portfast

D. The command spanning-tree portfast entered into the interface will turn on PortFast mode. This will allow the interface to forward first.