The completely revised, updated and only authorized textbook for the Cisco Networking Academy Program Network Security 1 and 2 course A portable reference that supports the topics in the Cisco Networking Academy Network Security course aligning 1:1 with course modules Features improved readability, enhanced topic explanations, real-world examples, and all-new graphical presentations Written by leading Academy instructor, Antoon Rufi, who bring a fresh voice to the course material Network Security 1 and 2 Companion Guide is the official supplemental textbook for version 2 of the Network Security 1 and 2 course of the Cisco Networking Academy Program. Completely revised and updated with new examples and explanations, this textbook includes original material developed by the author, yet it fully aligns with the Network Security curriculum. Written by an experienced author who presents material in a comprehensive manner--using his own voice and own examples--this new edition augments student understanding of course material. The new edition incorporates improved features to aid instructors and enhance student comprehension. For example, chapters align with course modules in both name and number, and chapter objectives are stated as questions to encourage students to think about and find answers as they read chapters. End-of-chapter questions and summaries align with chapter objectives to emphasize key topics, while key terms are listed in each chapter opener in the order of occurrence to alert students to upcoming vocabulary words. In addition, new features include "How To" quick references for step-by-step tasks; real-world examples and all-new illustrations; concise explanations with a focus on word usage and sentence structure for improved readability; and correlations to the CCNA exam in Chapter Objectives, Check Your Understanding questions, and new Challenge Activities.