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An operational PortFast receives a BPDU and automatically disables the port, what can be causing the issue?

The port is configured with BPDU Guard and instead of a Server or a host-computer, somebody has inadvertently plugged in a network cable from another switch running STP

The switch is globally configured with Root Guard feature.

The switch is filtering the BPDUs with BPDU filter function.

The port is configured as a trunk port.

Explanation

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