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Juniper Service Provider Routing and Switching, Specialist (JNCIS-SP) JN0-363 Question # 25 Topic 1 Discussion
JN0-363 Exam Topic 1 Question 25 Discussion:
Question #: 25
Topic #: 1
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?
A.
The device with the lowest MAC address will be elected as the root bridge.
B.
The device with the highest MAC address will be elected as the root bridge.
C.
The device with the lowest numerical lo0 IP address will be elected as the root bridge.
D.
The device with the highest numerical lo0 IP address will be elected as The bridge.
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.
References
Juniper Networks Technical Documentation on STP
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