MCQs

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1. OSI stands for:
   a. Open System Interconnection
   b. Operating System Interface
   c. Optical Service Implementation
   d. Open Service Internet
   Answer: asanfoundry+2
2. How many layers are there in the OSI model?
   a. Four
   b. Five
   c. Six
   d. Seven
   Answer: dexamtray+2
3. Which layer is responsible for physical connection of devices?
   a. Data Link
   b. Network
   c. Physical
   d. Transport
   Answer: ctestbook+1
4. Which layer is responsible for reliable data transfer and flow control?
   a. Application
   b. Transport
   c. Network
   d. Physical
   Answer: btestbook+1
5. Which layer segments and reassembles data for communication?
   a. Data Link
   b. Application
   c. Transport
   d. Physical
   Answer: cexamtray+1
6. The Presentation layer is layer number:
   a. 3
   b. 4
   c. 5
   d. 6
   Answer: dletsfindcourse+1
7. The main function of the Network layer is:
   a. Error detection
   b. Routing packets
   c. Data encryption
   d. Session management
   Answer: bletsfindcourse+1
8. Which layer handles data encryption and decryption?
   a. Application
   b. Presentation
   c. Session
   d. Physical
   Answer: bccbp+1
9. Error detection and correction occurs in:
   a. Data Link layer
   b. Network layer
   c. Presentation layer
   d. Session layer
   Answer: accbp+1
10. Which layer defines hardware specifications such as cables, switches, voltages?
    a. Session
    b. Transport
    c. Network
    d. Physical
    Answer: dtestbook+1
11. Which layer is responsible for logical addressing, e.g., IP addresses?
    a. Data Link
    b. Network
    c. Application
    d. Physical
    Answer: bletsfindcourse+1
12. The topmost layer of the OSI model is:
    a. Application
    b. Network
    c. Presentation
    d. Physical
    Answer: aexamtray+1
13. In which OSI layer does HTTP operate?
    a. Application
    b. Data Link
    c. Transport
    d. Physical
    Answer: atestbook+1
14. Which of the following connects the user to the network?
    a. Session
    b. Data link
    c. Application
    d. Network
    Answer: cexamtray+1
15. The Physical layer deals with:
    a. Frames
    b. Packets
    c. Bits
    d. Segments
    Answer: cletsfindcourse+2
16. Which layer provides end-to-end communication?
    a. Network
    b. Presentation
    c. Session
    d. Transport
    Answer: dtestbook+1
17. Which layer establishes, maintains, and terminates sessions?
    a. Session
    b. Transport
    c. Data Link
    d. Application
    Answer: aexamtray+1
18. Which OSI layer is responsible for framing?
    a. Network
    b. Data Link
    c. Transport
    d. Presentation
    Answer: bletsfindcourse+2
19. Which layer is responsible for flow control at the source and destination?
    a. Network
    b. Data Link
    c. Application
    d. Physical
    Answer: btestbook+2
20. Which protocol operates at the Network layer?
    a. HTTP
    b. TCP
    c. IP
    d. FTP
    Answer: cletsfindcourse+1
21. FTP mainly operates at which layer?
    a. Application
    b. Network
    c. Session
    d. Physical
    Answer: atestbook+1
22. Which of the following is NOT an OSI layer?
    a. Network
    b. Application
    c. Internetwork
    d. Session
    Answer: cinterviewbit+1
23. Which layer translates data formats between different systems?
    a. Presentation
    b. Network
    c. Data Link
    d. Physical
    Answer: aexamtray+2
24. What is the primary function of the Transport layer?
    a. Addressing
    b. Routing
    c. Reliable delivery
    d. Encryption
    Answer: cexamtray+1
25. Which layer creates logical paths, known as virtual circuits, for transmitting data?
    a. Presentation
    b. Network
    c. Application
    d. Data Link
    Answer: bletsfindcourse+1
26. Data encapsulation occurs at which OSI layer?
    a. Presentation
    b. Session
    c. Physical
    d. Data Link
    Answer: dletsfindcourse+1
27. Which layer is responsible for dialog control and token management?
    a. Data Link
    b. Session
    c. Network
    d. Transport
    Answer: bscribd+2
28. When data moves from upper to lower layers, headers are:
    a. Added
    b. Removed
    c. Rearranged
    d. Modified
    Answer: ascribd+1
29. Which layer is responsible for breaking up data into smaller units for transmission?
    a. Physical
    b. Transport
    c. Application
    d. Network
    Answer: btestbook+1
30. SMTP functions at which OSI layer?
    a. Application
    b. Network
    c. Presentation
    d. Session
    Answer: accbp+1
31. Which OSI layer provides service to the user?
    a. Physical
    b. Network
    c. Application
    d. Transport
    Answer: ctestbook+1
32. MAC addressing is associated with which layer?
    a. Transport
    b. Network
    c. Data Link
    d. Physical
    Answer: cexamtray+1
33. The lowest OSI layer is:
    a. Network
    b. Data Link
    c. Presentation
    d. Physical
    Answer: dexamtray+1
34. Which device operates exclusively at Layer 2?
    a. Hub
    b. Switch
    c. Router
    d. Firewall
    Answer: bletsfindcourse+1
35. The layer responsible for synchronization is:
    a. Transport
    b. Session
    c. Network
    d. Data Link
    Answer: btestbook+1
36. Which layer is used for hardware addressing?
    a. Data Link
    b. Network
    c. Physical
    d. Presentation
    Answer: aexamtray+1
37. At which layer do frames exist?
    a. Data Link
    b. Network
    c. Physical
    d. Application
    Answer: aletsfindcourse+2
38. IP addressing is handled by which layer?
    a. Application
    b. Data Link
    c. Network
    d. Transport
    Answer: ctestbook+1
39. Data transmission between DTE and DCE takes place at:
    a. Network
    b. Application
    c. Data Link
    d. Physical
    Answer: dexamtray+1
40. DNS works at which OSI layer?
    a. Application
    b. Physical
    c. Network
    d. Transport
    Answer: aletsfindcourse+1
41. Which layer performs data representation, encryption, and decryption?
    a. Presentation
    b. Transport
    c. Network
    d. Data Link
    Answer: accbp+2
42. Which OSI layer ensures data is received correctly?
    a. Application
    b. Presentation
    c. Data Link
    d. Physical
    Answer: cccbp+2
43. Which OSI layer works as an interface to user services?
    a. Network
    b. Presentation
    c. Application
    d. Data Link
    Answer: ctestbook+2
44. Which of the following is a Layer 4 protocol?
    a. IP
    b. TCP
    c. HTTP
    d. SMTP
    Answer: bletsfindcourse+1
45. Which OSI layer is concerned with transmission medium characteristics?
    a. Network
    b. Data Link
    c. Physical
    d. Transport
    Answer: cexamtray+1
46. Switches and bridges operate at:
    a. Application layer
    b. Data Link layer
    c. Network layer
    d. Transport layer
    Answer: btestbook+1
47. Segmentation and reassembly are performed at which layer?
    a. Network
    b. Transport
    c. Data Link
    d. Presentation
    Answer: bletsfindcourse+1
48. The layer that keeps the session up and running is:
    a. Network
    b. Data Link
    c. Session
    d. Physical
    Answer: cexamtray+1
49. Which OSI layer is responsible for coding and conversion functions?
    a. Physical
    b. Application
    c. Presentation
    d. Data Link
    Answer: ctestbook+1
50. Which layer deals with the syntax and semantics of information?
    a. Physical
    b. Presentation
    c. Session
    d. Application
    Answer: bletsfindcourse+2

1. https://www.sanfoundry.com/computer-networks-questions-answers-reference-models/
2. https://www.sanfoundry.com/cyber-security-questions-answers-osi-model-security-1/
3. https://www.interviewbit.com/computer-network-mcq/
4. https://www.examtray.com/networking/computer-networks-osi-reference-model-interview-mcq-questions-answers-1
5. https://testbook.com/objective-questions/mcq-on-concept-of-layering–5eea6a0939140f30f369d905
6. https://letsfindcourse.com/computer-network-mcq/osi-model-mcq-questions-and-answers
7. https://www.ccbp.in/blog/articles/computer-network-mcq
8. https://www.scribd.com/document/410240502/1-1-OSI-Model-Questions-MCQ-s-Part-1
9. https://www.youtube.com/watch?v=QqPpH52LaLw
10. https://networkwalks.com/osi-model-quiz-online/
11. https://examradar.com/osi-model-networking-online-test/
12. https://wayground.com/admin/quiz/6687989085ed976e84a54ede/osi-layer-quiz
13. https://www.scribd.com/document/448464964/COMPUTER-NETWORKS-OSI-MODEL-MCQs
14. https://www.youtube.com/watch?v=cFoBJodRARU