Networking Concepts
70 free practice questions with explanations
PassNova has 70 free CompTIA Network+ practice questions on Networking Concepts, each with a clear explanation. Practise them in the browser with instant feedback — 100% free, no sign-up, on any device. Updated for 2026.
Networking Concepts: example questions & answers
Here are 6 example questions from this topic. Practise the full set of 70 free in the browser.
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At which OSI layer do routers primarily operate?
- A Layer 1
- B Layer 2
- C Layer 3 ✓
- D Layer 4
Answer: Routers operate at Layer 3 (Network), making forwarding decisions based on IP addresses.
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At which OSI layer do switches primarily operate?
- A Layer 1
- B Layer 2 ✓
- C Layer 3
- D Layer 7
Answer: Switches operate at Layer 2 (Data Link), forwarding frames based on MAC addresses.
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Which OSI layer is responsible for end-to-end connections and reliability via TCP?
- A Network
- B Transport ✓
- C Session
- D Presentation
Answer: The Transport layer (Layer 4) handles end-to-end delivery, segmentation, and reliability (TCP/UDP).
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Which OSI layer handles physical transmission of bits over media?
- A Physical ✓
- B Data Link
- C Network
- D Application
Answer: Layer 1 (Physical) transmits raw bits over the physical medium.
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Which OSI layer is responsible for translation, encryption, and compression of data?
- A Session
- B Presentation ✓
- C Application
- D Transport
Answer: Layer 6 (Presentation) handles data translation, encryption, and compression.
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Which OSI layer establishes, manages, and terminates sessions between applications?
- A Transport
- B Session ✓
- C Presentation
- D Network
Answer: Layer 5 (Session) manages dialogues/sessions between applications.