Cisco Certified Network Associate (CCNA) Practice Exam 2025 - Free CCNA Practice Questions and Study Guide

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What component is essential for root bridge selection in STP?

The Bridge ID

The Bridge ID is the critical component for root bridge selection in Spanning Tree Protocol (STP). The Bridge ID consists of two parts: the Bridge Priority and the MAC Address of the switch. When STP is initiated, each switch in the network participates in the selection process to determine which switch will serve as the root bridge.

During this process, switches compare their Bridge IDs. The switch with the lowest Bridge ID becomes the root bridge. The Bridge Priority, a configurable value, provides administrators the ability to influence this selection by assigning a lower priority to a specific switch. If two switches have the same Bridge Priority, the MAC Address will break the tie, as it is universally unique to each switch.

In summary, the bridge ID's role in identifying and selecting the root bridge is fundamental to the functioning of STP, ensuring a loop-free topology in the network.

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The Port ID

The MAC Address

The Configuration Parameters

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