🌐 Network Security – OpenLearn (The Open University)

📚 This repository contains structured notes, demos, screenshots, and a certificate of completion for the Network Security course by OpenLearn – The Open University.

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🧠 Course Overview

This course introduces the principles of network security, including threats, defense mechanisms, protocols, and encryption techniques. It’s ideal for students in cybersecurity, IT, and ethical hacking.

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📚 Structured Notes

All notes are written in Markdown and cover key concepts:

• 🛡️ intro-to-network-security.md – Core principles, CIA triad
• ⚠️ network-threats.md – Malware, social engineering, DoS
• 🔥 firewalls-and-acls.md – Packet filtering, ACL examples
• 🔐 encryption-in-networks.md – Symmetric, asymmetric, hashing
• 🔗 secure-protocols.md – Secure vs insecure protocols

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🛠️ Demo Simulations

Hands-on demos simulating key network security concepts:

• 🔧 firewall-rules-example.md – Create basic iptables firewall rules
• 📡 packet-sniffing-simulation.md – Simulate traffic sniffing with tcpdump

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🚨 Network Misconfigurations

Real-world misconfiguration examples and how to fix them:

• 🔓 open-ports.md
• 🔑 weak-default-credentials.md
• 🔥 firewall-misconfiguration.md
• 🧪 insecure-services.md
• 📉 logging-disabled.md
• 📡 plaintext-transmission.md

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🖼️ Course Screenshots

Topic	Screenshot
🧩 Course Content
🎯 Learning Goals
✅ Course Review

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🎓 Certificate of Completion

• 🧠 OpenLearn Network security.pdf

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📝 Course Review: Network Security - OpenLearn

This OpenLearn course is a great foundation for anyone exploring network security. Despite being introductory, it covers essential concepts that are critical in real-world cybersecurity work.

✅ What I Liked

• Accessible language and structured layout

• Clear explanations of protocols, threats, and encryption

• Good for security-minded beginners (Red Team or Blue Team)

📌 What Could Be Improved

• Include more interactive labs or packet capture exercises

• Expand slightly on modern threats like phishing kits, botnets

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💡 Ideal For

• Students in IT, cybersecurity, or CTF beginners
• System administrators wanting a security refresh
• Learners preparing for CompTIA Security+, CEH, or OSCP tracks

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✍️ Author

Thành Danh – Pentester & Cybersecurity Research

GitHub: @ngvtdanhh

Email: [email protected]

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📄 License

This project is licensed under the terms of the GNU AGPL v3.0.
See LICENSE for full details.

© 2025 ngvtdanhh. All rights reserved.