Refer to the topology shown in the exhibit. Which ports……

单项选择题Which statement about vlan operation on cisco catalyst switches is true?（）

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?（）

A.2 through 1001
B.1 through 1001
C.1 through 1002
D.2 through 1005

多项选择题Which two link protocols are used to carry multiple VLANs over a single link? （）

A.VTP
B.802.1q
C.IGP
D.ISL
E.802.3u

单项选择题Refer to the exhibit. Why has this switch not been elected the root bridge for VLAN1?（）

A.It has more than one interface that is connected to the root network segment.
B.It is running RSTP while the elected root bridge is running 802.1d spanning tree.
C.It has a higher MAC address than the elected root bridge.
D.It has a higher bridge ID than the elected root bridge.

单项选择题Why will a switch never learn a broadcast address?（）

A.Broadcast frames are never sent to swiches.
B.Broadcast addresses use an incorrect format for the switching table.
C.A broadcast address will never be the source address of a frame.
D.Broadcasts only use network layer addressing.
E.A broadcast frame is never forwarded by a switch.