📖 What is Open Systems Interconnection (OSI) Model?
A conceptual framework used to describe the functions of a networking system across seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.
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Sensei Says:
"Mnemonic time! 'Please Do Not Throw Sausage Pizza Away' from bottom to top. For the exam, know which layer common devices and protocols operate on (e.g., switches at Layer 2, routers at Layer 3)."
📚 Certification: Certified Network Associate (200-301)
🔑 What are the Key Concepts of Open Systems Interconnection (OSI) Model?
- ▸ Encapsulation and decapsulation process across layers.
- ▸ Layer-specific PDUs: segments, packets, frames, bits.
- ▸ Separation of concerns in networking protocols.
🎯 How does Open Systems Interconnection (OSI) Model appear on the 200-301 Exam?
Identify which layer a specific device (like a router or switch) operates on.
Determine the OSI layer associated with a specific troubleshooting symptom.
❓ Frequently Asked Questions
Is the OSI model used in practice?
It's primarily a reference model; TCP/IP is the practical implementation.
Which layer handles encryption?
The Presentation Layer (Layer 6) typically handles data formatting and encryption.
Related Terms from Certified Network Associate
Overlay Network
Access Port
WPA2 (Wi-Fi Protected Access 2)
Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)
SDN Controller
Trunk Port