Reading the Network: netstat, ss & nmap Explained
Master ss, netstat, and nmap to see every open port, active connection, and service on your system. Real terminal output walkthroughs and pro security tips.
Top 20 Network Ports Every IT Pro Must Know
The definitive visual guide to the 20 most important network ports. Not just a list — each port comes with real-world context, a story, and a security insight.
What is a Port? The Visual Guide to Network Ports
Every network connection uses a port number. Learn what ports are, why they exist, and how TCP/UDP ports work with real-world analogies and hands-on commands.
TCP vs UDP: The Visual Guide for Beginners
Why does video lag but emails never arrive broken? The difference between Reliable (TCP) and Fast (UDP) protocols explained.
What is a Firewall? The Visual Guide
Learn how firewalls protect your network, the difference between hardware and software firewalls, and how to configure UFW on Linux.
IP Addressing Explained for Beginners
Understand IPv4 addresses, subnet masks, public vs private IPs, and CIDR notation with visual diagrams and practical examples.
The OSI Model: 7 Layers Explained Visually
Understand the OSI Model's 7 layers with real-world analogies, visual diagrams, and practical examples. The foundation of all networking knowledge.
What is a VPN? The Visual Guide
How Virtual Private Networks (VPNs) encrypt your data, hide your IP, and bypass geo-blocks. The complete visual explanation.
How the Internet Works: A Visual Journey for Absolute Beginners
What happens when you type google.com? Follow your data's incredible journey across the internet in this visual guide.
How DNS Works: The Internet's Phone Book Explained
Learn how DNS translates domain names to IP addresses in under 100 milliseconds. Visual guide with step-by-step breakdown.