At which OSI layer does STP operate?Answer:Spanning Tree Protocol (STP) operates at the Data Link layer (Layer 2) of the OSI model.Switches and bridges running the spanning-tree algorithm communicate by exchanging multicast messages called bridge protocol data units (BPDUs) at regular intervals. BPDUs are used to build and maintain the spanning tree, ensuring a stable loop-free topology.BPDU exchange facilitates the following:Election of a root switch (only one per spanning tree)Election of a designated switch for each switched segmentRemoval of loops by placing redundant switch ports in a backup (non-forwarding) stateSTP is implemented on bridges and switches in order to prevent loops in the network. STP should be used in situations where redundant links are used.Objective:Layer 2 Technologies Sub-Objective:Configure and verify spanning treeReferences:Cisco > Home > Support > Technology Support > LAN Switching > Spanning Tree Protocol > Configure > Configuration Examples and Technotes > Spanning Tree Protocol > Understanding and Configuring Spanning Tree Protocol (STP) on Catalyst SwitchesCisco > Support > Configuring Spanning Tree Protocol > How STP Works
Which OSI layer does STP operate?
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