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Refer to the exhibit. What is true about the Spanning Tree Instances of Switch SW3?
It is the root bridge of VLAN 1 and VLAN10.
It is the root bridge only for VLAN10.
STP is not running in any VLAN because Port Fast BPDU Guard is disabled.
It is the root bridge of VLAN 1.
From the command output is possible to see that SW3 is the root bridge for VLAN 10. However for VLAN 1 it has 3 ports in blocking state, meaning that it cannot be the root bridge of VLAN 1. Port Fast BPDU Guard is an interface feature that allows listening for incoming STP BPDU messages and disables the interface if any are received. For more information refer to: [http://www.cisco.com/en/US/tech/tk389/tk621/technologiestechnote09186a008009482f.shtml]
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