Network fundamentals
43 practice questions with explanations — 15 free to try
3 of these 43 questions are in the free 15-question taster · the full topic is part of Premium
PassNova has 43 Cisco CCNA practice questions on Network fundamentals, each with a clear explanation. A 15-question taster is free with no sign-up; the full bank is part of PassNova Premium. Updated for 2026.
Network fundamentals: example questions & answers
3 worked examples with answers and explanations below. Try 15 Cisco CCNA questions free in the browser; the full 43-question Network fundamentals bank is part of PassNova Premium.
How many layers are there in the OSI reference model?
- A4
- B5
- C7✓
- D8
Answer: The OSI model has 7 layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.
At which layer of the OSI model does a router primarily operate?
- ALayer 1 (Physical)
- BLayer 4 (Transport)
- CLayer 2 (Data Link)
- DLayer 3 (Network)✓
Answer: Routers operate at Layer 3, forwarding packets based on logical IP addresses.
Which layer of the TCP/IP model corresponds to OSI Layers 5, 6, and 7 combined?
- ATransport
- BInternet
- CNetwork Access
- DApplication✓
Answer: The TCP/IP Application layer maps to the OSI Session, Presentation, and Application layers.