How does STP prevent forwarding loops at OSI Layer 2?
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A. B. C. D.D
STP (Spanning Tree Protocol) is a protocol that is used to prevent forwarding loops in network topologies that have redundant paths. These redundant paths can cause loops in the network, which can result in broadcast storms and other issues that can severely impact network performance.
To prevent these loops, STP operates at OSI Layer 2 and uses a unique algorithm to dynamically calculate a loop-free logical topology. This logical topology is created by disabling redundant paths in the network, which allows for a single active path between any two network devices.
STP accomplishes this by first electing a root bridge, which is the central point of the logical topology. All other switches in the network will then elect a root port, which is the port that has the shortest path to the root bridge.
Once the root bridge and root ports have been elected, STP will then disable any ports that are not part of the active path between switches. This is accomplished by placing these ports in a blocked state, which prevents any traffic from being forwarded through these ports.
As a result of this process, STP ensures that there is only one active path between any two devices in the network, which prevents any forwarding loops from occurring. This allows for a stable and efficient network topology that can withstand network failures and other issues.
In conclusion, option D "Port blocking" is the correct answer as STP uses port blocking to prevent forwarding loops at OSI Layer 2.