Cisco CCNA Exam 200-125: PortFast BPDU Guard Interface Response

How PortFast BPDU Guard Interface Responds to Received BPDUs

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When an interface is configured with PortFast BPDU guard, how does the interface respond when it receives a BPDU?



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A. B. C. D.


If a BPDU is received on an interface that is configured with PortFast BPDU guard, the interface will go into an errdisable state. This is because the BPDU indicates that there is a problem with the network topology, and the interface is being used in an unintended way. The errdisable state is a protective mechanism that disables the interface to prevent network loops and other potential issues.

In the errdisable state, the interface is shut down, and the administrator must manually re-enable the interface using the "shutdown" and "no shutdown" commands on the interface. To avoid the errdisable state, the network administrator can disable PortFast BPDU guard on the interface or configure the interface as a trunk port, which allows the passage of multiple VLANs.

Therefore, the correct answer to the given question is D. It goes into an errdisable state when it receives a BPDU.