单项选择题
A.when a packet is received from an 802.1Q trunk,the vlan id can be determined from the source MAC address table.
B.unkown unicast frames are retransmitted only to the ports that belong to the same vlan
C.ports between switches should be configured in access mode so that vlans can span across the ports
D.broadcast and multicast frames are retransmitted to ports that are configured on different vlan.
单项选择题 assuming the default switch configuration which vlan range can be added modified and removed on a cisco switch?（）
多项选择题 Which two link protocols are used to carry multiple VLANs over a single link? （）
单项选择题 Refer to the exhibit. Why has this switch not been elected the root bridge for VLAN1?（）