单项选择题
A.Switch2# configure terminal Switch2（config）# interface range gigabitethernet3/1 -2 Switch2（config-if）# channel-group 5 mode auto
B.Switch2# configure terminal Switch2（config）# interface range gigabitethernet3/1 -2 Switch2（config-if）# channel-group 5 mode passive
C.Switch2# configure terminal Switch2（config）# interface range gigabitethernet3/1 -2 Switch2（config-if）# channel-group 5 mode desirable
D.Switch2# configure terminal Switch2（config）# interface range gigabitethernet3/1 -2 Switch2（config-if）# channel-group 5 mode on
单项选择题 Refer to the exhibit. What command was issued on the Layer 3 switch Sw1 between Exhibit #1 and Exhibit #2？（）
单项选择题 WhatmustbethesametomakemultipleswitchespartofthesameMultipleSpanningTree（MST）？（）
单项选择题 Refer to the exhibit. Switch 15 is configured as the root switch for VLAN 10 but not for VLAN 20. If the STP configuration is correct， what will be true about Switch 15？（）
