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BPDU Guard Definition: BPDU Guard is a feature used in network switches to prevent unauthorized switches from participating in the Spanning Tree Protocol by placing interfaces into an error-disabled state when receiving Bridge Protocol Data Units (BPDUs).
BPDU Guard is a feature in network switches that helps prevent Bridge Protocol Data Units (BPDU) from unauthorized devices from entering the network. When enabled on switch ports, BPDU Guard shuts down the port if it detects any BPDU frames coming through, which helps prevent certain types of network attacks, such as spanning tree protocol manipulation or rogue switch insertion.