Refer to the exhibit. Which statement is true?（）
A.The Fa0/11 role confirms that SwitchA is the root bridge for VLAN 20.
B.VLAN 20 is running the Per VLAN Spanning Tree Protocol.
C.The MAC address of the root bridge is 0017.596d.1580.
D.SwitchA is not the root bridge, because not all of the interface roles are designated.
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A.source MAC address
B.source IP address
C.source switch port
D.destination IP address
E.destination port address
F.destination MAC address
A.data link
B.network
C.physical
D.transport
A.RSTP significantly reduces topology reconverging time after a link failure.
B.RSTP expends the STP port roles by adding the alternate and backup roles.
C.RSTP port satates are blocking,discarding,learing,or forwarding.
D.RSTP also uses the STP proprsal-agreement sequence.
E.RSTP use the same timer-baseed process as STP on point-to-point links.
F.RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
Refer to the exhibit A frame on vlan 1 on switch s1 is sent to switch s2 when the frame is received on vlan 2,what causes this behavior?（）
A.trunk mode mismatches
B.vlans that do not correspond to a unique IP subnet
C.native vlan mismatches
D.allowing only vlan 2 on the destination.
Refer to the topology shown in the exhibit. Which ports will be STP designated ports if all the links are operating at the same bandwidth? （）
A.Switch A - Fa0/0
B.Switch A - Fa0/1
C.Switch B - Fa0/0
D.Switch B - Fa0/1
E.Switch C - Fa0/0
F.Switch C - Fa0/1
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.
A.2 through 1001
B.1 through 1001
C.1 through 1002
D.2 through 1005
A.VTP
B.802.1q
C.IGP
D.ISL
E.802.3u
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.
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.
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