What is the spanning tree status on A1 and A2?

Refer to the exhibits.

Exhibit 1

Exhibit 2

Switch-1(config)# spanning-tree

Switch-1(config)# spanning-tree config-name “exam”

Switch-1(config)# spanning-tree instance 1 vlan 10-19

Switch-1(config)# spanning-tree instance 2 vlan 20-29

Switch-2(config)# spanning-tree

Switch-2(config)# spanning-tree config-name “exam”

Switch-2(config)# spanning-tree instance 1 vlan 10-19

Switch-2(config)# spanning-tree instance 2 vlan 20-29

Switch-2(config)# spanning-tree priority 0

Switch-2(config)# spanning-tree instance 1 priority 0

Switch-2(config)# spanning-tree instance 2 priority 1

Switch-3(config)# spanning-tree

Switch-3(config)# spanning-tree config-name “exam”

Switch-3(config)# spanning-tree instance 1 vlan 10-19

Switch-3(config)# spanning-tree instance 2 vlan 20-29

Switch-3(config)# spanning-tree priority 1

Switch-3(config)# spanning-tree instance 1 priority 1

Switch-3(config)# spanning-tree instance 2 priority 0

Switch-4(config)# spanning-tree

Switch-4(config)# spanning-tree config-name “exam”

Switch-4(config)# spanning-tree instance 1 vlan 10-19

Switch-4(config)# spanning-tree instance 2 vlan 20-29

The network administrator enters the commands shown in Exhibit 2.

What is the spanning tree status on A1 and A2?
A . Both A1 and A2 forward traffic.
B . A1 blocks traffic, and A2 forwards traffic.
C . Both A1 and A2 block traffic.
D . A1 forwards traffic, and A2 blocks traffic.

View Answer

Answer: D