Understanding Spanning Tree and Loop Prevention

Spanning Tree Protocol (STP) is essential for preventing loops in Ethernet networks because Ethernet frames lack a time-to-live (TTL) field, meaning they could circulate indefinitely if a loop occurs. The protocol operates by discovering the network topology and identifying which links can create loops, subsequently putting those links into a blocking state. Broadly used for broadcast communications, the risk comes from excessive broadcast frames that can overwhelm a network and disrupt communication. By maintaining a stable topology, STP ensures that only one active path exists at any given time, preventing network congestion issues stemming from loops.