Summary:Cisco PortFast gives you an important warning when you configure it, but someone may ignore it.  Learn how BPDU Guard works with PortFast from Chris Bryant, CCIE #12933. Keywords:cisco, ccnp, certification, bpdu, guard, portfast, port, fast, switch, err-disabled, exam, pass Article Body:In your CCNA studies, you learned about PortFast and the trouble it can cause if configured on...