Refer to the exhibit. STP has been implemented in the network. Switch SW_A is the root switch for the default VLAN. To reduce the broadcast domain, the network administrator decides to split users on the network into VLAN 2 and VLAN 10. The administrator issues the command spanning-tree vlan 2 root primary on switch SW_A. What will happen as a result of this change?
A.
All ports of the root switch SW_A will remain in forwarding mode throughout the reconvergence of the spanning tree domain.
B.
Switch SW_A will change its spanning tree priority to become root for VLAN 2 only.
C.
Switch SW_A will remain root for the default VLAN and will become root for VLAN 2.
D.
No other switch in the network will be able to become root as long as switch SW_A is up and running.
Why B is incorrect?
SW_A was initially root bridge for default VLAN (VLAN1), therefore the right option is that it remains root for VLAN1 while becoming root for VLAN 2. It is the wording that may confuse you.
I agree that C is correct, but why is B incorrect? Or it shouldn’t?
Answer B says that SW_A become root for VLAN 2 ONLY, and thats wrong, since it is Default VLAN AND VLAN 2.