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.
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maybe A ?
Right, A.
Vlan 3 have a root port on A2 because switch 2 vlan 3 not in tagged vlan to switch1 and switch3. No untagged vlan 3 to Switch2. Spanning tree for vlan 3 running independently at each switch in IST pool. That’s make the A2 port become root port.