17/06/2026
What is the OSI Model?
The OSI (Open Systems Interconnection) Model is a framework that explains how data travels from one device to another over a network. It consists of 7 layers, and each layer has a specific role in ensuring smooth communication.
Application Layer – User services (HTTP, FTP, DNS, SMTP)
Presentation Layer – Encryption, compression, formatting
Session Layer – Establishes and manages connections
Transport Layer – Reliable data transfer (TCP, UDP)
Network Layer – IP addressing and routing
Data Link Layer – Error detection and MAC addressing
Physical Layer – Cables, signals, and hardware devices
💡 Why is the OSI Model important?
Simplifies network communication
Helps troubleshoot network issues
Provides a standard for networking protocols
Makes learning networking easier
