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200-301 · Question #1451
200-301 Question #1451: Real Exam Question with Answer & Explanation
The correct answer is D: SW 4. In Spanning Tree Protocol (STP), the root bridge is elected based on the lowest Bridge ID, which combines a configurable bridge priority with the switch's MAC address.
Submitted by brentm· Mar 5, 2026DOMAIN_LIST_NOT_PROVIDED
Question
Refer to the exhibit. Which switch becomes the root bridge?
Options
- ASW 1
- BSW2
- CSW 3
- DSW 4
Explanation
In Spanning Tree Protocol (STP), the root bridge is elected based on the lowest Bridge ID, which combines a configurable bridge priority with the switch's MAC address.
Common mistakes.
- A. SW1 would not be the root bridge if SW4 has a lower Bridge ID, implying SW1's Bridge ID is higher.
- B. SW2 would not be the root bridge if SW4 has a lower Bridge ID, implying SW2's Bridge ID is higher.
- C. SW3 would not be the root bridge if SW4 has a lower Bridge ID, implying SW3's Bridge ID is higher.
Concept tested. STP root bridge election
Reference. https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10556-16.html
Topics
#Spanning Tree Protocol#STP root bridge#STP election
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