Learn OSI Model Step-by-Step | All 7 Layers Explained with Labs | Data Flow System !

Learn OSI Model Step-by-Step | All 7 Layers Explained with Labs | Data Flow System !

by SikhoLive Cyber Security

Formal & Physical Sciences Computing & Cybersecurity UTComputer networking and communicationsUTPNetworking standards and protocols
🎙 SikhoLive Cyber Security 👥 58K 📅 April 25, 2026 ⏱ 50 min 👁 212 📄 tutorial 🧭 2026-08-16
Available in: English (current) Français

Keywords

OSI modellayersdata flowsession hijackingencryption

Summary

This tutorial explains the OSI (Open Systems Interconnection) model, a seven-layer framework for understanding data flow in networks. The instructor, from SikhoLive Cyber Security, breaks down each layer: Application, Presentation, Session, Transport, Network, Data Link, and Physical. For each layer, he describes its function, protocols, and devices. He uses practical examples, such as web browsing (HTTP/HTTPS), email (SMTP, POP, IMAP), and file transfer (FTP). He demonstrates the difference between HTTP and HTTPS, emphasizing encryption and security. He also shows a live session hijacking attack by manipulating a session ID in browser storage, illustrating the importance of session management. The video covers TCP and UDP in the Transport layer, routing in the Network layer, MAC addresses in the Data Link layer, and physical media in the Physical layer. It concludes with a brief comparison to the TCP/IP model, noting its four layers. The presentation is interactive, with questions from the audience, and includes security tips throughout.

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Critical Evaluation

Value of the Information & Strength of the Argument

The video provides a solid foundational explanation of the OSI model, valuable for beginners in networking and cybersecurity. The instructor uses relatable analogies and practical demonstrations, such as showing the session ID in browser storage and how it can be hijacked, which effectively illustrates the Session layer’s function. The argumentation is clear and logical, building each layer upon the previous one. However, the depth is limited; some layers are explained superficially, and the instructor occasionally digresses into unrelated topics like security tips and audience engagement. The practical demonstrations are the strongest part, offering concrete examples that enhance understanding.

Scientific Rigor, Source Quality, Title Accuracy

The video does not cite any authoritative sources, relying solely on the instructor’s knowledge. The title accurately describes the content, which is a step-by-step tutorial. The scientific rigor is moderate: while the core concepts are correct, there are minor inaccuracies, such as attributing encryption to the Presentation layer (though it also involves the Application layer). The instructor mentions protocols and devices but does not provide references. The description includes links to social media and other videos, but no direct references to standards or academic works. The title is appropriate, and the content aligns with it.

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Title / Content Match

The title accurately reflects the content: a step-by-step tutorial covering all 7 layers with practical demonstrations.

Quality & Reliability

6/10

The video provides a clear and structured explanation of the OSI model, with practical demonstrations of session hijacking and HTTP/HTTPS differences. However, it lacks citations to authoritative sources, contains some inaccuracies (e.g., presentation layer functions), and is primarily pedagogical rather than rigorous.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Cited Sources

Concurring Sources

Dissenting Sources

  • Presentation layer - Wikipedia — The video attributes encryption to the Presentation layer, but in practice encryption often occurs in the Application layer (e.g., TLS). This is a common simplification but technically imprecise.

Contribution & Novelties

The video offers a practical, beginner-friendly walkthrough of the OSI model, with unique live demonstrations such as session hijacking and HTTP vs HTTPS comparison. It bridges theory with real-world security implications, making it engaging for aspiring cybersecurity professionals. However, it does not introduce new scientific concepts but rather repackages existing knowledge in an accessible format.

Pour aller plus loin :

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Radar Profile

The radar profile shows moderate scores across all dimensions, with a slight peak in quantity of information. This indicates a balanced but not exceptional tutorial, strong in coverage but lacking in depth and rigor.

Reliability 5/10

💬 No comments were provided for analysis.