200-301 Question #1297: Real Exam Question with Answer & Explanation

The correct answer is D: SW4. In a Spanning Tree Protocol (STP) enabled network, the root bridge is elected based on the lowest Bridge ID (BID), which comprises the bridge priority and the MAC address. Assuming all priorities are default, the switch with the numerically lowest MAC address will become the root

Submitted by carter_n· Mar 5, 2026<NO_DOMAIN_LIST_PROVIDED>

Question

Refer to the exhibit. Which switch becomes the root bridge?

Options

ASW3
BSW2
CSW1
DSW4

Explanation

In a Spanning Tree Protocol (STP) enabled network, the root bridge is elected based on the lowest Bridge ID (BID), which comprises the bridge priority and the MAC address. Assuming all priorities are default, the switch with the numerically lowest MAC address will become the root bridge.

Common mistakes.

A. SW3 would only be the root if it had the lowest BID, which is not the case given SW4 is the correct answer.
B. SW2 would only be the root if it had the lowest BID, which is not the case given SW4 is the correct answer.
C. SW1 would only be the root if it had the lowest BID, which is not the case given SW4 is the correct answer.

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

#STP#Root Bridge Election#LAN Switching

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