Free Sample Chapters

Master pfSense, the powerful open-source firewall built on FreeBSD. This hands-on, project-driven guide covers installation, VLANs, firewall rules, NAT, DHCP/DNS, OpenVPN, IPsec, WireGuard, High Availability, IDS/IPS with Suricata and Snort, monitoring, backup, and automation.

Build rock-solid networking fundamentals: OSI/TCP-IP, IP addressing, subnetting, protocols, devices, DNS/DHCP, troubleshooting, and security essentials—explained clearly with real-world examples.

Learn the fundamentals of network security, including traffic protection, firewalls, segmentation, monitoring, and defense against common network threats.

Learn how modern networks are attacked and defended. Understand network threats, architecture, firewalls, encryption, monitoring, and defensive strategies used in real-world environments.

A complete guide for the CompTIA Security+ exam. Learn core security concepts, threats, cryptography, network security, incident response, and exam strategies to pass Security+ with confidence.