200-301 Question 211
Single answerA network administrator is troubleshooting a Rapid PVST+ network. The network consists of multiple switches, and one of the switches is consistently becoming the Root Bridge. The administrator wants to configure a specific switch to always act as the Root Bridge. Which command should the administrator use?
- A
spanning-tree vlan
root primary - B
spanning-tree vlan
priority 32768 - C
spanning-tree vlan
root secondary - D
spanning-tree mode pvst
Show answer and explanation
Correct answer: A
Explanation
In Rapid PVST+, the Root Bridge is determined based on the lowest bridge priority. The 'spanning-tree vlan
- A. Correct.
This command configures the switch as the Root Bridge by automatically adjusting its priority to a value lower than the current Root Bridge. This is the correct answer.
- B. Incorrect.
This command manually sets the priority value for the specified VLAN to 32768, which may not always make the switch the Root Bridge unless the current Root Bridge has a higher priority. This is not the most straightforward method.
- C. Incorrect.
This command configures the switch as a backup Root Bridge by setting its priority lower than the default but higher than the primary Root Bridge. It does not guarantee the switch will always act as the Root Bridge.
- D. Incorrect.
This command enables PVST mode on the switch but does not affect the Root Bridge election process. It is irrelevant to configuring a specific Root Bridge.