This book originated from my notes during engineering and master’s studies, created to simplify complex networking and security concepts and help students gain a clear understanding of both areas. Networks and security are often taught separately, though in practice they are inseparable you cannot secure what you do not understand. This book unifies both concepts in a logical flow, from network architecture and protocols to defence principles like cryptography and their real-world use. It serves as a concise companion for quick learning and review, helping readers build confidence in network security. The author hopes this book will be useful to students in India and expresses gratitude to his parents Manoj Kumar Mech and Latha Narayanan Valli, his sister Meenal Mech, the professors who reviewed this work, and God for His blessings. He also thanks his grandparents M. Narayanan & Valliammal Narayanan, Gopal Sharma & late Joya Mech, and Chendur Publishing for their guidance and support.
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