This document provides an overview and index of topics covered in a practical book for the CCNAx 200-120 exam. The book focuses on hands-on training for topics like initial configuration, switching, routing, WAN technologies and more. An about the author section introduces Bassem Hamed, the network and security engineer who authored the book, and provides his contacts. The index previews chapters on configurations, VLANs, port security, STP, Ethernet channels, routing protocols, ACLs, NAT, IPv6 and other subjects.