Networks and Security BY Dr. N. Prathap, Dr. V. Rajakani, Dr. R. Rajaganapathi, Mr. R. Hariharan

The rapid evolution of digital technologies, cloud computing, mobile platforms, and the Internet of Things has transformed the way individuals, organizations, and societies communicate and exchange information. In this highly connected world, computer networks serve as the backbone of modern communication, while security mechanisms ensure the confidentiality, integrity, and availability of data. Together, networking and security form the foundation of today’s digital infrastructure and play a critical role in safeguarding information systems against emerging threats.
The book Networks and Security has been carefully designed to provide a comprehensive understanding of the fundamental principles, advanced concepts, and practical applications of computer networks and cybersecurity. It aims to bridge the gap between theoretical foundations and real-world implementation, enabling readers to develop both conceptual clarity and hands-on skills required in academic, research, and industry environments.
This volume is a collaborative effort of multiple authors from Anjalai Ammal Mahalingam Engineering College, Kovilvenni, Thiruvarur, Tamil Nadu, India. Each contributor brings rich experience in teaching, research, and professional practice in the areas of networking technologies, information security, and emerging digital systems. The diverse perspectives and collective expertise of the authors have helped shape this book into a well-rounded and practice-oriented resource that addresses the current needs of students and professionals alike.
The book begins with the basics of data communication, network architectures, transmission media, and protocol models, gradually progressing to switching, routing, wireless networks, and modern Internet technologies. It further explores essential security concepts such as cryptography, authentication, access control, firewalls, intrusion detection systems, secure network design, and cyber threat mitigation. Special emphasis has been placed on contemporary topics including cloud security, ethical hacking, blockchain security, IoT security, and secure network management to reflect the demands of today’s technological landscape.
To enhance learning outcomes, the chapters incorporate illustrative diagrams, practical examples, case studies, laboratory exercises, and problem-solving tasks. This hands-on approach enables readers to apply theoretical knowledge to real-time scenarios and develop critical thinking and analytical skills. The book is therefore suitable not only as a textbook for undergraduate and postgraduate courses, but also as a reference for competitive examinations, research scholars, and industry practitioners.
As a multi-author academic initiative, this work reflects our shared commitment to delivering quality education and fostering technical excellence among learners. We sincerely hope that this book will serve as a reliable guide for students, educators, and professionals seeking to build strong foundations in networking and security and to contribute meaningfully to the protection of modern digital ecosystems.
We believe that the knowledge and practices presented in this book will inspire readers to innovate responsibly, design secure systems, and address the ever-growing challenges in the field of network technologies and cybersecurity.
With this, we invite you to begin your journey into the fascinating and vital domain of Networks and Security, and we wish you an enriching and rewarding learning experience.