This book is the fourth volume in the "Ethical Hacking" series, which is a comprehensive set of 21 guides designed to prepare readers for the EC-Council CEF (Certified Encryption Specialist) exam, a globally recognized certification for cybersecurity professionals. Volume 4 focuses on enumeration techniques, which are essential for network reconnaissance. The book covers various enumeration tools and techniques, such as SNMP enumeration, LDAP enumeration, DNS enumeration, and SMTP enumeration. The unique feature of this volume is its emphasis on active and passive enumeration techniques. The book provides readers with a comprehensive understanding of how to enumerate networks and devices effectively. This includes understanding the different types of enumeration, their purpose, and the potential impact of enumeration on network security. Additionally, the book provides insight into detecting and responding to enumeration attempts, vulnerabilities, and cyberattacks. As part of the "Ethical Hacking" series, this book emphasizes the principles of ethical hacking. It emphasizes the importance of conducting ethical hacking activities to identify vulnerabilities and improve network security. The book provides practical examples and exercises to help readers understand how enumeration techniques can be applied in an ethical hacking context. Overall, "Ethical Hacking - Volume 4: Enumeration Techniques" is an essential resource for cybersecurity professionals, network administrators, and anyone interested in improving their network reconnaissance skills. It provides readers with the necessary knowledge and techniques to effectively enumerate networks and devices while adhering to ethical hacking principles.