OSI Model MCQs – [Which of the following OSI Layer?]

By: Prof. Dr. Fazal Rehman | Last updated: May 2, 2025

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1. Which layer is responsible for allowing users to send data, access data, and use networks?



2. Which is the 7th layer of the OSI model?



3. Which is the end-user layer in the OSI model?



4. Which OSI layer uses File Transfer Protocol (FTP)?



5. Which OSI layer is responsible for Domain Name System (DNS)?



6. Which OSI layer uses Simple Mail Transfer Protocol (SMTP)?



7. On which layer is SSL used in the OSI model?



8. On which layer is SSH used in the OSI model?



9. On which layer is IMAP used in the OSI model?



10. Which layer is responsible for encryption and decryption in the OSI model?



11. On which layer do sockets work in the OSI model?



12. Remote Procedure Call Protocol (RPC) works on which OSI layer?



13. Point-to-Point Tunneling Protocol (PPTP) works on which OSI layer?



14. Session Control Protocol (SCP) works on which OSI layer?



15. Session Description Protocol (SDP) works on which OSI layer?



16. TCP and UDP work on which OSI layer?



17. IPv4 and IPv6 work on which OSI layer?



18. IGMP works on which OSI layer?



19. ICMP works on which OSI layer?



20. IPSec works on which OSI layer?



21. Encapsulation and fragmentation work on which OSI layer?



22. Which OSI layer is responsible for frames?



23. Switch works on which OSI layer?



24. Bridge works on which OSI layer?



25. Ethernet works on which OSI layer?



26. Media Access Control (MAC) is a sublayer of which OSI layer?



27. Which layer is responsible for presenting data to the application layer?



28. Which is the 6th layer of the OSI model?



29. Which layer is responsible for opening sessions, ensuring they remain open, and closing them when communication ends?



30. Which is the 5th layer of the OSI model?



 

 

which of the following OSI layer is
which of the following OSI layer is

Layers of the OSI Model

Layer Responsibility
7. Application Layer
  • Allows users to send data, access data and use networks.
  • End User layer
  • Protocols:
    • File Transfer Protocol (FTP)
    • Simple Mail Transfer Protocol (SMTP)
    • Domain Name System (DNS)
    • IRC, HTTP
    • SSH, DNS
6. Presentation Layer
  • Presenting the data to the application layer Syntax layer
  • MPEG, IMAP, SSL, SSH, FTP, JPEG,
  • Data conversion
  • Character code translation
  • Data compression
  • Encryption and decryption

 
5. Session Layer
  • Responsible for opening sessions, ensuring they remain open and functional while data is being transferred, and closing them when communication ends.
  • Synch & send to port
  • WinSock, API’s, Sockets
  • Protocols:
    • Remote procedure call protocol (RPC)
    • Point-to-Point Tunneling Protocol (PPTP)
    • Session Control Protocol (SCP)
    • Session Description Protocol (SDP)

 

 

 

 

 

 
4. Transport Layer
  • Controls the reliability of a given link through flow control, segmentation and desegmentation, and error control.
  • End-to-end connections
  • Protocols: TCP, UDP
  • error control
  • flow control
  • congestion control
3. Network Layer
  • routing the data via the best physical path
  • Packets
  • Protocols: IPSec, ICMP, IGMP, IP, IPv4, IPv6.
  • Best available path
  • traffic controls
  •  congestion of data packets
  •  encapsulation and fragmentation
2. Data Link Layer
  • Responsible for multiplexing data streams, data frame detection, medium access, and error control.
  • Frames
  • Switch, PPP, Bridge, Ethernet
  • Media Access Control (MAC) Layer

 
1. Physical Layer
  • Responsible for the communication of the unstructured raw data streams over a physical medium
  • Hardware: Coaxial cable, Fiber optic cable, Repeaters, Wireless, Hubs
  • Topologies : Bus, Ring, Star, and Mesh topology
  • Communication modes: Simplex, Half Duplex, and Full Duplex etc
  • Data transmission performance: Bit Rate and Bit Synchronization

 

 

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