A trunk link between two switches did not come up as expected. The configuration on Switch A is as follows:

Switch A# show running-config interface gigabitethernet0/1
interface GigabitEthernet0/1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1-10
switchport mode dynamic auto
no shutdown

The interface configuration on Switch B is as follows:

Switch B# show running-config interface gigabitethernet0/1
interface GigabitEthernet0/1
switchport trunk encapsulation dot1q
switchport mode dynamic auto
switchport access vlan 5
no shutdown

Which one of the following reasons is probably causing the problem?

a. The two switches don’t have matching switchport trunk allowed vlan commands.
b. Neither switch has a native VLAN configured.
c. Both switches are configured in the dynamic auto mode.
d. Switch B is configured to use access VLAN 5.


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