ITS Networking Practice Test

What is the purpose of Spanning Tree Protocol (STP) in a switched network?

STP prevents loops by creating a loop-free tree topology and blocking redundant paths. STP increases network throughput by parallel paths. STP assigns IP addresses to VLANs automatically. STP floods broadcast frames to all ports to ensure delivery.

Correct Answer:

STP prevents loops by creating a loop-free tree topology and blocking redundant paths.

Explanation:

Preventing loops in a switched network by creating a loop-free tree topology and blocking redundant paths. When multiple switches and redundant links exist, frames can wander in cycles, causing broadcast storms and MAC address table instability. STP designates a root bridge and selects a designated port on each network segment, turning off (blocking) the other links that could form loops. This establishes a single active path between devices, forming a spanning tree. If a link fails, STP reconfigures to unblock a previously blocked path, restoring redundancy without reintroducing loops. This is why STP’s purpose is to prevent loops, not to increase throughput, assign IPs to VLANs, or flood broadcasts.

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