Refer to the exhibit. How was spanning-tree configured on this interface?

A. By entering the command spanning-tree portfast trunk in the interface configuration mode.
B. By entering the command spanning-tree portfast in the interface configuration mode
C. By entering the command spanning-tree mst1 vlan 10,20,30,40 in the global configuration mode
D. By entering the command spanning-tree vlan 10,20,30,40 root primary in the interface configuration mode

Refer to the exhibit. How was spanning-tree configured on this interface?

A. By entering the command spanning-tree portfast trunk in the interface configuration mode.
B. By entering the command spanning-tree portfast in the interface configuration mode
C. By entering the command spanning-tree mst1 vlan 10,20,30,40 in the global configuration mode
D. By entering the command spanning-tree vlan 10,20,30,40 root primary in the interface configuration mode

Correct Answer: A

Since there are multiple VLANs on the port, the port is in trunk mode. If you leave the trunk keyword (answer B), the following message is shown:

%Portfast has been configured on GigabitEthernet0/10 but will only have effect when the interface is in a non-trunking mode.