This book contains 21 core chapters, Chapters 1 through 21, with Chapter 22 including some suggestions for how to approach the actual exams. Each core chapter covers a subset of the topics on the ICND2 exam. The core chapters are organized into sections. The core chapters cover the following topics:
Chapter 1, “Spanning Tree Protocol Concepts,” discusses the concepts behind IEEE Spanning Tree Protocol (STP) and how it makes some switch interfaces block frames to prevent frames from looping continuously around a redundant switched LAN.