单项选择题
A.Switch SW1 has been configured with the spanning-tree vlan 1 root primary global configuration command.
B.Switch SW1 has been configured with the spanning-tree vlan 1 root secondary global configuration command.
C.Switch SW1 has been configured with the spanning-tree vlan 1 priority 24577 global configuration command.
D.Switch SW1 has been configured with the spanning-tree vlan 1 hello-time 2 global configuration command.
E.The root bridge has been configured with the spanning-tree vlan 1 root secondary global configuration command.
单项选择题 Refer to the exhibit. On the basis of the output of the show spanning-tree inconsistentports command， which statement about interfaces FastEthernet 0/1 and FastEthernet 0/2 is true？（）
单项选择题 Refer to the exhibit. STP has been implemented in the network. Switch SW_A is the root switch for the default VLAN. To reduce the broadcast domain， the network administrator decides to split users on the network into VLAN 2 and VLAN 10. The administrator issues the command spanning-tree vlan 2 root primary on switch SW_A. What will happen as a result of this change？（）
单项选择题 Refer to the exhibit. The command switchport mode access is issued on interface FastEthernet0/13 on switch CAT1. What will be the result？（）
