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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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The 'bpdufilter default' command enables BPDU filtering on all PortFast-enabled interfaces, preventing the interfaces from sending or receiving BPDUs. BPDU filtering is disabled if a PortFast interface receives a BPDU, allowing the interface to participate in STP and continue operation. Option B is incorrect because the 'bpduguard default' command will err-disable the port if it receives a BPDU on a PortFast-enabled port. Option C is incorrect because it lacks BPDU control. Option D is incorrect because enabling BPDU Guard on an interface will put the interface in an err-disabled mode if it receives a BPDU, which is the same scenario as in Option B
bpduguard will put ports into err-disabled if bpdu received.
A. Switch1(config)# spanning-tree portfast bpdufilter default Switch1(config)# interface f0/1 Switch1(config-if)# spanning-tree portfast Explanation: The command "spanning-tree portfast bpdufilter default" enables PortFast on all access ports and applies the BPDU filter. This allows the port to immediately transition to the forwarding state and prevents the interface from sending or receiving BPDUs. The command "interface f0/1" enters the interface configuration mode for fa0/1. The command "spanning-tree portfast" enables PortFast on the interface.