OSI Network Layers Quiz

Reviewed by Godwin Iheuwa
Godwin Iheuwa, MS, Computer Science |
Computer Expert
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Godwin is a proficient Database Administrator currently employed at MTN Nigeria. He holds as MS in Computer Science from the University of Bedfordshire, where he specialized in Agile Methodologies and Database Administration. He also earned a Bachelor's degree in Computer Science from the University of Port Harcourt. With expertise in SQL Server Integration Services (SSIS) and SQL Server Management Studio, Godwin's knowledge and experience enhance the authority of our quizzes, ensuring accuracy and relevance in the realm of computer science.
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OSI Network Layers Quiz - Quiz

An amazing "OSI Network Layer Quiz" is here for you. The International Standards Organization (ISO) developed the Open Systems Interconnection (OSI) model, which divides network communication into seven layers. Layers 1-4 are considered the lower layers and mostly concern themselves with moving data around, whereas Layers 5-7 are the upper layers and contain application-level data. The quiz is here to test your knowledge of the OSI Reference Model in Computer Networking. Give it a try!


Questions and Answers
  • 1. 

    How many OSI layers are there?

    • A.

      5

    • B.

      6

    • C.

      7

    • D.

      8

    • E.

      9

    Correct Answer
    C. 7
    Explanation
    The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes the functions of a communication system into seven different layers. Each layer has a specific role and interacts with the layer above and below it. These layers include the physical layer, data link layer, network layer, transport layer, session layer, presentation layer, and application layer. Therefore, the correct answer is 7.

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  • 2. 

    At which layer do router devices operate?

    • A.

      Data Link Layer

    • B.

      Network Layer

    • C.

      Transport Layer

    • D.

      Physical Layer

    • E.

      Application Layer

    Correct Answer
    B. Network Layer
    Explanation
    Router devices operate at the Network Layer. This layer is responsible for routing packets across different networks. Routers use routing tables to determine the best path for forwarding packets to their destination. They make decisions based on the network address in the packet's header. By operating at the Network Layer, routers can connect different networks and enable communication between them.

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  • 3. 

    Which layer manages the reliable transfer of data from the host to host (or end to end)?

    • A.

      Network Layer

    • B.

      Data Link Layer

    • C.

      Session Layer

    • D.

      Presentation Layer

    • E.

      Transport Layer

    Correct Answer
    E. Transport Layer
    Explanation
    The Transport Layer is responsible for managing the reliable transfer of data from the host to host or end to end. This layer ensures that the data is delivered accurately and in the correct order. It also handles error detection and correction, flow control, and congestion control. The Transport Layer uses protocols such as TCP (Transmission Control Protocol) to provide reliable and ordered delivery, or UDP (User Datagram Protocol) for faster but less reliable delivery.

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  • 4. 

    The network is the 3rd OSI layer.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes the functions of a communication system into seven different layers. The third layer of this model is known as the network layer. It is responsible for routing and forwarding data packets across different networks. Therefore, the given statement is true as it correctly identifies the network layer as the third layer of the OSI model.

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  • 5. 

    The Session layer communicates with which other layers?

    • A.

      None

    • B.

      Application and Transport

    • C.

      Transport and Network

    • D.

      Transport and Presentation

    • E.

      Transport, Presentation, and Network

    Correct Answer
    D. Transport and Presentation
    Explanation
    Remember, layers can only communicate with the layer directly above and below them.

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  • 6. 

    Encapsulation occurs at all of the layers.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Encapsulation primarily occurs at the object-oriented programming (OOP) layer, specifically in the context of classes and objects. It is a fundamental concept in OOP that involves bundling data and methods that operate on the data within a single unit (an object). Encapsulation helps in hiding the internal details of an object and exposing only what is necessary for external use. In other layers, such as networking or software architecture layers, different principles (like information hiding, data abstraction, etc.) might be more relevant, but the term "encapsulation" is closely associated with OOP.

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  • 7. 

    What devices operate at the Data Link Layer?

    • A.

      Hubs and Repeaters

    • B.

      Routers

    • C.

      Hubs

    • D.

      Switches

    • E.

      Repeaters

    Correct Answer
    D. Switches
    Explanation
    Switches operate at the Data Link Layer. The Data Link Layer is the second layer of the OSI model and is responsible for transferring data between adjacent network nodes. Switches are networking devices that receive data packets and forward them to their intended destination based on the MAC address. They operate at the Data Link Layer by using MAC addresses to make forwarding decisions and create separate collision domains for connected devices. Hubs and Repeaters also operate at the Physical Layer, while Routers operate at the Network Layer.

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  • 8. 

    Which layers can provide error detection and correction?

    • A.

      1

    • B.

      2

    • C.

      3

    • D.

      4

    • E.

      5

    Correct Answer(s)
    B. 2
    D. 4
    Explanation
    Error detection and correction can be provided by two layers: the data link layer and the transport layer. The data link layer(2) is responsible for detecting errors at the physical level using techniques like parity check and cyclic redundancy check (CRC). The transport layer(4), on the other hand, ensures error-free delivery of data by using mechanisms like sequence numbers, acknowledgments, and retransmissions. Therefore, both these layers play a crucial role in error detection and correction, making options 2 and 4 the correct answers.

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  • 9. 

    Name a protocol that operates at the Transport Layer.

    • A.

      PCT

    • B.

      PPT

    • C.

      TCP

    • D.

      None

    Correct Answer
    C. TCP
    Explanation
    TCP (Transmission Control Protocol) is a protocol that operates at the Transport Layer. It is responsible for establishing a reliable, connection-oriented communication between devices on a network. TCP ensures that data packets are delivered in the correct order and without errors, by providing error detection and correction mechanisms. It also manages flow control and congestion control to prevent network congestion. TCP is widely used in applications that require reliable and ordered transmission of data, such as web browsing, email, file transfer, and streaming.

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  • 10. 

    What is the name of the layer that selects the best path for data to be transmitted?

    • A.

      Physical layer

    • B.

      Network

    • C.

      Transport layer

    • D.

      None of these

    Correct Answer
    B. Network
    Explanation
    The correct answer is "Network". The network layer is responsible for selecting the best path for data to be transmitted. It determines the most efficient route for data packets to travel from the source to the destination, taking into account factors such as network congestion, reliability, and cost. This layer also handles addressing and routing protocols to ensure that data is delivered accurately and efficiently across different networks.

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Godwin Iheuwa |MS, Computer Science |
Computer Expert
Godwin is a proficient Database Administrator currently employed at MTN Nigeria. He holds as MS in Computer Science from the University of Bedfordshire, where he specialized in Agile Methodologies and Database Administration. He also earned a Bachelor's degree in Computer Science from the University of Port Harcourt. With expertise in SQL Server Integration Services (SSIS) and SQL Server Management Studio, Godwin's knowledge and experience enhance the authority of our quizzes, ensuring accuracy and relevance in the realm of computer science.
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