A question about BPDU. What would a PortFast BPDU guard port do when it is configured on a port? (Choose two)
- err-disabled when port receives BPDUs
- supported only on nontrunking access ports
- forward when port receives BPDUs
- supported on trunk ports
Explanation: PortFast BPDU guard prevents loops by moving a nontrunking port into an errdisable state when a BPDU is received on that port. When you enable BPDU guard on the switch, spanning tree shuts down PortFast-configured interfaces that receive BPDUs instead of putting them into the spanning tree blocking state. In a valid configuration, PortFast-configured interfaces do not receive BPDUs. If a PortFast-configured interface receives a BPDU, an invalid configuration exists. BPDU guard provides a secure response to invalid configurations because the administrator must manually put the interface back in service.
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