This book is for IT professionals working hard to keep up with new technology whilst retaining old skills learnt. Extremely useful as an office or interview preparation reference, it is a condensed deep dive and refresher into layer 2 switching on Cisco devices giving detailed information in a format easy to remember. There are mnemonics and codes to assist with fast recall of information and topics are laid out in a way to ensure fast retention of technical aspects. It covers layer 2 technologies such as VLANs, VTP, inter-VLAN routing and Spanning Tree Protocol (STP). Furthermore it is very quick to read and avoids any necessary explanations focusing exactly on what you need to know.