Juniper JN0-363 Exam - Topic 3 Question 69 Discussion

Actual exam question for Juniper's JN0-363 exam

Question #: 69
Topic #: 3

You are bringing a new network online with three MX Series devices enabled for STP. No root bridge priority has been configured. Which statement is true in this scenario?

AThe device with the lowest MAC address will be elected as the root bridge.

BThe device with the highest MAC address will be elected as the root bridge.

CThe device with the lowest numerical lo0 IP address will be elected as the root bridge.

DThe device with the highest numerical lo0 IP address will be elected as The bridge.

Show Suggested Answer

Suggested Answer: A

https://supportportal.juniper.net/s/article/EX-Identify-the-Root-Bridge-in-a-Spanning-Tree-STP-network?language=en_US The root bridge in a spanning-tree network is the bridge with the smallest or the lowest bridge ID.

In the absence of a manually configured priority, the Spanning Tree Protocol (STP) elects the root bridge based on the lowest bridge ID, which is a combination of the priority and the MAC address. The device with the lowest MAC address will have the lowest bridge ID and thus be elected as the root bridge.

Juniper Networks Technical Documentation on STP

by Emile at Apr 12, 2026, 11:27 AM

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Nettie

1 day ago

I think the lowest MAC address gets elected as the root bridge if no priority is set, but I'm not completely sure.

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