Refer to the exhibit. Which statement is true?

Question:
Refer to the exhibit. Which statement is true?

• The Fa0/11 role confirms that SwitchA is the root bridge for VLAN 20.
• VLAN 20 is running the Per VLAN Spanning Tree Protocol
• The MAC address of the root bridge is 0017.596d.1580.
• SwitchA is not the root bridge, because not all of the interface roles are designated

Explanation: nly non-root bridge can have root port. Fa0/11 is the root port so we can confirm this switch is not the root bridge -> A is not correct.

From the output we learn this switch is running Rapid STP, not PVST -> B is not correct.

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 -> C is not correct.

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 -> D is correct.

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