Cisco 200-125 Exam

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.
Answer: Option D.
Explanation: 

Only non-root bridge can have root port. Fa0/11 is the root port so we can confirm this switch is not the root bridge ->
From the output we learn this switch is running Rapid STP, not PVST -> 0017.596d.1580 is the MAC address of this switch, not of the root bridge. The MAC address of the root bridge is 0017.596d.2a00 ->
All of the interface roles of the root bridge are designated. SwitchA has one Root port and 1 Alternative port so it is not the root bridge.

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