200-301 · Question #1335
Refer to the exhibit. Which switch becomes the root bridge?
The correct answer is B. SW2. In this Spanning Tree Protocol (STP) topology, SW2 is elected as the root bridge.
Question
Refer to the exhibit. Which switch becomes the root bridge?
Options
- ASW4
- BSW2
- CSW3
- DSW4
How the community answered
(35 responses)- A9% (3)
- B83% (29)
- C3% (1)
- D6% (2)
Why each option
In this Spanning Tree Protocol (STP) topology, SW2 is elected as the root bridge.
SW4 does not have the lowest Bridge ID, therefore it will not become the root bridge.
In Spanning Tree Protocol (STP), the root bridge is elected based on the lowest Bridge ID, which comprises a configurable bridge priority and the switch's MAC address; SW2 has the lowest Bridge ID in this scenario, making it the root.
SW3 does not have the lowest Bridge ID, therefore it will not become the root bridge.
SW4 does not have the lowest Bridge ID, therefore it will not become the root bridge.
Concept tested: STP root bridge election
Source: https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10556-1.html
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