Question:
A BPDU guard is configured on an interface that has PortFast enabled. Which state does the interface enter when it receives a BPDU?
- Blocking
- Shutdown
- Listening
- Errdisable
Explanation: PortFast BPDU guard prevents loops by moving a nontrunking port into an errdisable state when a BPDU is received on that port.In a valid configuration, PortFast-configured interfaces do not receive BPDUs (because PortFast should only be configured on interfaces which are connected to hosts). 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.Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4000/8-2glx/configuration/guide/stp_enha.html
Exam with this question: CCNA v3.0 (200-125) Study Guide – Exam Dumps
Please login or Register to submit your answer