Second Edition 2021.What makes you a firewall expert? Understand different firewall products and the Packet-flows. Get familiarize with Change management and understand how to incorporate change management process in to firewall management operations. This book gives you a broad overview on Firewalls, packet flows, hardening, management & operations and the best practices followed in the industry. Though this book is mainly intended for firewall administrators who are in to operations, this book give a quick introduction and comparisons of the major firewall vendors and their products. In this book I have covered the following topics.Various Job roles related to Firewalls.What makes you a firewall expert?Know the major firewall vendors and their models.Firewall ranking and benchmarks.Understand the packet flow or order of operation.Understand the different types of firewalls.Daily tasks of a firewall administratorRules review, backup, logsGuidelines on firewall hardening and compliance.Understand Change Management process.Illustration on How to make a firewall change (incorporating Change management process) with a real world example.Note: This book is not a configuration guide. Intended for beginners and junior professionals.