200-301 · Question #1364
Refer to the exhibit. Which switch becomes the root bridge?
The correct answer is D. SW 2. This question asks to identify the Spanning Tree Protocol (STP) root bridge, which requires examining an exhibit showing switch Bridge IDs that is not provided.
Question
Refer to the exhibit. Which switch becomes the root bridge?
Options
- ASW 4
- BSW 3
- CSW 1
- DSW 2
How the community answered
(32 responses)- A3% (1)
- B13% (4)
- C3% (1)
- D81% (26)
Why each option
This question asks to identify the Spanning Tree Protocol (STP) root bridge, which requires examining an exhibit showing switch Bridge IDs that is not provided.
(Assuming a relevant exhibit existed) SW 4 would not be the root bridge if SW 2 had a lower Bridge ID (e.g., a lower configured priority or a lower MAC address in case of equal priority).
(Assuming a relevant exhibit existed) SW 3 would not be the root bridge if another switch, such as SW 2, possessed a numerically lower Bridge ID.
(Assuming a relevant exhibit existed) SW 1 would not be the root bridge if SW 2's Bridge ID was numerically smaller than SW 1's.
(Assuming a relevant exhibit existed) SW 2 would become the root bridge if it had the lowest Bridge ID, which is determined by the combination of its bridge priority and MAC address, with lower values being preferred.
Concept tested: STP Root Bridge Election (Missing Exhibit)
Source: https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10556-16.html
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