Interactive Network Defense Guide

Welcome to the Interactive Network Defense Guide

This application translates complex network security lectures and labs into an interactive experience.

Comprehensive guide covering Network Security Fundamentals and Technical Controls.

⚠️ Cybersecurity Lab Warning

The skills and techniques discussed in this course are for educational and authorized purposes ONLY. All hands-on practice must be conducted in a secure, isolated lab environment (e.g., virtual machines) completely disconnected from any public or private networks. Applying these skills to any system, network, or application without explicit, written permission from the owner is illegal and may result in severe civil and criminal penalties. Practice legally and ethically.

Legal Disclaimer

The information provided in this course outline and all associated materials is for informational purposes only and does not constitute professional advice. The author, Cyber Soho, makes no warranties regarding the accuracy, completeness, or suitability of this information. Any reliance you place on such information is strictly at your own risk. In no event will the author be liable for any loss or damage including, without limitation, indirect or consequential loss or damage, or any loss or damage whatsoever arising from the use of this course or the information contained within.

Non-Affiliation & Editorial Disclaimer

This course and its content represent the editorial opinion and intellectual property of Cyber Soho. The author's relationship with Dawson College is that of a "non-tenured visiting teacher". The author is not otherwise affiliated with, endorsed by, or partnered with Dawson College, or any other organization or certification body mentioned or unmentioned. All product names, logos, and brands are property of their respective owners.

Core Security Concepts

This section explores the fundamental "why" of network security. These are the core principles and strategies that form the foundation of all defensive actions. Interact with the cards below to learn about each concept.

Information Assurance (IA) Principles

Network Defense Approaches

1. Preventive

Methods used to avoid threats or attacks *before* they happen. (e.g., Firewalls, Encryption).

2. Reactive

Methods used to detect attacks *while* they are in progress. (e.g., Intrusion Detection Systems).

3. Retrospective

Methods used to examine the causes *after* an attack. (e.g., Digital Forensics, Log Analysis).

4. Proactive

Methods used to make informed decisions about *future* potential attacks. (e.g., Threat Intelligence).

Technical Deep Dive: Firewalls

This section explores the technical controls from Module 5, focusing on firewalls. Firewalls are the gatekeepers of the network. Use the tools below to understand their types and how they are configured using `iptables`.

Firewall Sorter

Select a type

Click a button to see its description here.

Interactive `iptables` Builder

Chain

Action (Target)

Protocol

Source/Port

iptables -A INPUT -p tcp -j DROP

Practical Labs: Linux Endpoint Security

Due date for Labs submission - November 29, 2025 via Omnivox's Lea !

Theory is one thing, practice is another. This section contains the step-by-step exercises for hardening a Linux system. Select a lab from the menu to see its objectives and key commands.

Select a Lab

Select a lab from the menu on the left to get started.