OSI Model · 7 Layers
📘 OSI Model MCQs – 20 CCNA Practice Questions (All 7 Layers)
The OSI Model (Open Systems Interconnection Model) is a conceptual framework used in networking to understand how data travels from one device to another across a network. It consists of 7 layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.
This OSI Model MCQ practice test is designed for CCNA aspirants, Network Engineering students, and IT exam preparation. It includes scenario-based questions covering encapsulation, PDU flow, routing, switching, TCP/UDP, error detection, encryption, and session management.
📌 What You Will Learn
- Functions of all 7 OSI layers
- PDU flow (Segment → Packet → Frame → Bits)
- Encapsulation and de-encapsulation
- Layer-based troubleshooting
- CCNA exam-style conceptual clarity
- Port numbers, FCS, LLC sublayer, and more
🔍 Why this quiz? Each question includes a full explanation and a “wrong distractor” analysis — why the other options are incorrect, just like in the real CCNA exam. Perfect for mastering the OSI model and encapsulation.
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