Dive into an in-depth exploration of three optional Spanning Tree Protocol (STP) features: PortFast, BPDU Guard, and BPDU Filter. Learn how to configure PortFast, understand its application on edge and trunk ports, and examine the behavior of Bridge Protocol Data Units (BPDUs) on PortFast-enabled ports. Discover the purpose and configuration of BPDU Guard, including its relationship with the ErrDisable state. Investigate BPDU Filter and its potential impact on network stability. Reinforce your understanding with three quizzes and gain practical insights through real-world examples. This video is part of a comprehensive CCNP ENCOR 350-401 course, offering free resources such as flashcards, labs, and practice exams to support your certification journey.