OSI Model Layers and Functions

Computer Networking

This content outlines the 7 layers of the OSI model, detailing their functions, data units, and example protocols. It covers everything from the Application Layer down to the Physical Layer, providing a comprehensive overview of network communication principles.

OSI Model Networking Protocols

30 Questions Medium Ages 14+ Mar 4, 2026

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About this Study Set

This study set covers Computer Networking through 30 practice questions. This content outlines the 7 layers of the OSI model, detailing their functions, data units, and example protocols. It covers everything from the Application Layer down to the Physical Layer, providing a comprehensive overview of network communication principles. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 30 questions from the OSI Model Layers and Functions study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 What is the top layer of the OSI model?

A Physical Layer
B Session Layer
C Application Layer
D Transport Layer

2 Which layer is responsible for end-to-end connections and reliability?

A Network Layer
B Transport Layer
C Session Layer
D Data Link Layer

3 What data unit is used at the Network Layer?

A Segment
B Datagram
C Packet
D Frame

4 The Presentation Layer is responsible for what?

A Session establishment
B Recognizing data
C Media transmission
D Logical addressing

5 Which layer deals with physical addressing (MAC)?

A Network Layer
B Transport Layer
C Data Link Layer
D Physical Layer

6 What is an example protocol for the Application Layer?

A TCP
B HTTP
C IP
D Ethernet

7 Which layer handles media, signals, and binary transmission?

A Data Link Layer
B Physical Layer
C Network Layer
D Transport Layer

8 What is the primary function of the Session Layer?

A Data recognition
B End-to-end connectivity
C Session establishment and termination
D Logical addressing

9 What data unit is associated with the Transport Layer (TCP)?

A Packet
B Datagram
C Segment
D Frame

10 Which layer is responsible for logical addressing (IP) and path determination?

A Data Link Layer
B Network Layer
C Transport Layer
D Session Layer

11 An example protocol for the Presentation Layer is:

A DNS
B HTML
C UDP
D RS-232

12 What is the data unit at the Data Link Layer?

A Packet
B Frame
C Segment
D Bits

13 Which layer is concerned with network process to application?

A Presentation Layer
B Application Layer
C Session Layer
D Transport Layer

14 What does the Physical Layer transmit?

A Packets
B Frames
C Segments
D Bits

15 Which layer is responsible for data formatting and encryption?

A Application Layer
B Session Layer
C Presentation Layer
D Transport Layer

16 What is an example protocol for the Data Link Layer?

A IPv4
B 802.3 Ethernet
C TCP
D TLS

17 Which layer ensures reliable data transfer between hosts?

A Network Layer
B Session Layer
C Transport Layer
D Application Layer

18 What is the main purpose of the Network Layer?

A Media transmission
B Logical addressing and routing
C Session management
D Data encryption

19 Which layer is closest to the end-user?

A Physical Layer
B Data Link Layer
C Application Layer
D Transport Layer

20 What is an example protocol for the Transport Layer?

A HTTP
B HTML
C TCP
D IP

21 The OSI model has how many layers?

22 Which layer is responsible for establishing, managing, and terminating connections?

A Network Layer
B Transport Layer
C Session Layer
D Presentation Layer

23 What is an example protocol for the Network Layer?

A 802.11 Wireless
B ICMP
C TLS
D SSH

24 Which layer deals with the physical transmission of data over a medium?

A Data Link Layer
B Network Layer
C Transport Layer
D Physical Layer

25 What is the data unit at the UDP protocol?

A Segment
B Datagram
C Packet
D Frame

26 Which layer is responsible for translating data between the application and the network format?

A Session Layer
B Presentation Layer
C Transport Layer
D Network Layer

27 What is an example protocol for the Physical Layer?

A 802.3 Ethernet
B DSL
C HTTP
D UDP

28 Which layer handles the flow control and error correction between adjacent nodes?

A Network Layer
B Transport Layer
C Data Link Layer
D Physical Layer

29 What does 'IP' stand for in the context of logical addressing?

A Internet Protocol
B Internal Protocol
C Information Protocol
D Interface Protocol

30 Which layer provides services to the application layer and is closest to the user?

A Presentation Layer
B Session Layer
C Transport Layer
D Application Layer

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