OSI Model Explained in 26 Minutes | All 7 Layers Simplified

Learn the essential concepts of the OSI protocols with this audio-first study guide designed for networking beginners. This lesson breaks down all seven layers of the OSI model in simple, easy-to-understand language so you can master network fundamentals while commuting, exercising, or studying with your eyes closed. This audio lecture is perfect for IT students, entry-level helpdesk or networking roles, and anyone starting their journey in computer networking. You’ll understand how data moves through a network, from physical cables to applications, and why the OSI model is so important for troubleshooting and design. 🎧 In this audio lesson: 0:00 – Introduction to the OSI model and why it matters 2:30 – Layer 1: Physical Layer (cables, signals, hardware) 5:00 – Layer 2: Data Link Layer (frames, MAC addresses, switches) 8:15 – Layer 3: Network Layer (IP addresses, routing, logical addressing) 11:45 – Layer 4: Transport Layer (TCP, UDP, ports, reliability) 14:30 – Layer 5: Session Layer (sessions, connections, dialog control) 16:45 – Layer 6: Presentation Layer (data formats, encryption, compression) 19:00 – Layer 7: Application Layer (network applications and services) 21:30 – How all seven OSI layers work together in real communication 24:00 – Real-world examples to remember each layer 26:00 – Summary and key exam takeaways Use this recording for repeated audio revision before networking exams, certification tests, or whenever you need to reinforce your understanding of the OSI model and basic network protocols.