200-301 · Question #1486
Refer to the exhibit. Which switch becomes the root bridge?
The correct answer is A. SW 1. This question asks to identify the root bridge in a Spanning Tree Protocol (STP) network, based on information provided in an exhibit.
Question
Refer to the exhibit. Which switch becomes the root bridge?
Exhibits
Options
- ASW 1
- BSW 2
- CSW 3
- DSW 4
How the community answered
(15 responses)- A80% (12)
- B13% (2)
- C7% (1)
Why each option
This question asks to identify the root bridge in a Spanning Tree Protocol (STP) network, based on information provided in an exhibit.
In Spanning Tree Protocol (STP), the switch with the lowest Bridge ID (BID) is elected as the root bridge; assuming SW 1 has the lowest BID (either due to a lower bridge priority or, if priorities are equal, the lowest MAC address), it will become the root.
SW 2 would only become the root bridge if its Bridge ID was lower than all other switches, which contradicts SW 1 being the root based on the correct answer.
SW 3 would only become the root bridge if its Bridge ID was lower than all other switches, which contradicts SW 1 being the root based on the correct answer.
SW 4 would only become the root bridge if its Bridge ID was lower than all other switches, which contradicts SW 1 being the root based on the correct answer.
Concept tested: Spanning Tree Protocol (STP) Root Bridge election
Source: https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10556-16.html
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