What is Spanning Tree Protocol and why is it important in a Layer 2 network?

What is Spanning Tree Protocol and why is it important in a Layer 2 network?

• A. STP dynamically adds extra paths to improve redundancy.
• B. STP is used to assign IP addresses to endpoints.
• C. STP prevents loops by disabling redundant paths, ensuring there is a single active path between switches.
• D. STP is a method for encrypting traffic on a LAN.

Answer: (C)

Spanning Tree Protocol creates a loop-free layout in a Layer 2 Ethernet network by preventing data frames from circulating endlessly. In networks where switches are connected through multiple redundant paths, a loop can cause broadcast storms and MAC table instability. STP designates a root bridge and calculates the best path to that root for every switch, then puts certain redundant ports into a blocking state so there is only one active path between any two switches. If a link fails, STP can re-evaluate and reactivate a previously blocked path, restoring redundancy without reintroducing loops. This is why STP is essential: it maintains network stability and continuity at Layer 2 by eliminating loops while still allowing redundancy. The other options describe IP address assignment or encryption, which are outside STP’s purpose.

Spanning Tree Protocol creates a loop-free layout in a Layer 2 Ethernet network by preventing data frames from circulating endlessly. In networks where switches are connected through multiple redundant paths, a loop can cause broadcast storms and MAC table instability. STP designates a root bridge and calculates the best path to that root for every switch, then puts certain redundant ports into a blocking state so there is only one active path between any two switches. If a link fails, STP can re-evaluate and reactivate a previously blocked path, restoring redundancy without reintroducing loops. This is why STP is essential: it maintains network stability and continuity at Layer 2 by eliminating loops while still allowing redundancy. The other options describe IP address assignment or encryption, which are outside STP’s purpose.