The 'CCNA Master Guide: A Protocol-Centric Approach to Modern Networking' by Vikram Singh Sankhala is meticulously crafted for individuals new to networking who seek a structured and foundational understanding of how modern networks operate. This comprehensive guide moves beyond rote memorization, focusing on the fundamental interplay between protocols, devices, and services that form the backbone of all network communication. Sankhala's motivation to simplify complex concepts is evident throughout, as he systematically breaks down the roles of key protocols – from Ethernet and IP to TCP/UDP and routing protocols like OSPF and EIGRP – illustrating precisely how they enable devices to communicate and deliver essential services. The book emphasizes the practical application of these protocols within various network devices such as switches, routers, and wireless access points, demonstrating how their functions evolve based on the protocols they support. By demystifying the protocol-driven nature of networking, this guide aims to equip readers with both a deep conceptual understanding and the practical ability to configure and troubleshoot real-world network environments, fostering confidence for CCNA certification and beyond. The 'CCNA Master Guide' delves into the core components of networking, structuring its content around the crucial role of communication protocols. Readers will explore the intricacies of Layer 2 through Layer 7 protocols, understanding not just their functions but how data actually flows, errors are managed, and routing decisions are made. The book systematically covers essential network devices and their functionalities, illustrating how they act as enablers for protocol implementation. Furthermore, it highlights the network services that result from this protocol-device synergy, including VLANs, DHCP, DNS, ACLs, and VPNs. The ultimate goal of this book is to empower readers with a working knowledge of networking, enabling them to not only prepare effectively for CCNA certification but also to confidently apply their skills in configuring and troubleshooting live network infrastructures, bridging the gap between theoretical knowledge and practical IT job requirements.