On what switch ports should BPDU guard be enabled to enhance STP stability?
- all PortFast-enabled ports
- only ports that are elected as designated ports
- only ports that attach to a neighboring switch
- all trunk ports that are not root ports
Explanation: End-user ports should connect only to end-user devices and not to other switches. To prevent a switch from being added to the network on an end-user port, BPDU guard will immediately put the port into the error disabled state if a BPDU is received on that port. However, if PortFast is not configured on an end-user port, BPDU guard is not activated on that port.
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