OSI Model Layers Quiz

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Questions and Answers

Which organization developed the Open Systems Interconnection model (OSI model)?

  • International Organization for Standardization (ISO) (correct)
  • Internet Engineering Task Force (IETF)
  • Institute of Electrical and Electronics Engineers (IEEE)
  • World Wide Web Consortium (W3C)

How many abstraction layers are there in the OSI reference model?

  • Six
  • Five
  • Eight
  • Seven (correct)

Which layer in the OSI model is responsible for transmitting bits across a communications medium?

  • Network Layer
  • Physical Layer (correct)
  • Session Layer
  • Transport Layer

What was the Internet protocol suite developed contemporarily to the OSI model?

<p>TCP/IP (D)</p> Signup and view all the answers

Which organization primarily funded the development of the Internet protocol suite?

<p>U.S. Department of Defense (B)</p> Signup and view all the answers

In the OSI reference model, which layer serves the highest-level representation of data of a distributed application?

<p>Application Layer (B)</p> Signup and view all the answers

According to the text, what is the OSI model used for?

<p>Teaching and documentation purposes (A)</p> Signup and view all the answers

Which entity do communication protocols enable to interact with a corresponding entity at the same layer in another host?

<p>Layer N (A)</p> Signup and view all the answers

What is responsible for the transmission and reception of unstructured raw data between a device and a physical transmission medium?

<p>Layer 1: Physical layer (B)</p> Signup and view all the answers

Which ISO/IEC document defines the Basic Model of the OSI model?

<p>ISO/IEC 7498-1 (B)</p> Signup and view all the answers

What do two entities at the communicating devices exchange by means of a layer N protocol?

<p>Protocol data units (PDUs) (C)</p> Signup and view all the answers

At which layer is the data transmitted to the receiving device composed into a protocol data unit (PDU)?

<p>Layer N (A)</p> Signup and view all the answers

What does the physical layer convert digital bits into?

<p>Electrical, radio, or optical signals (B)</p> Signup and view all the answers

Which layer is responsible for the timing of voltage levels and characteristics such as voltage levels?

<p>Layer 1: Physical layer (A)</p> Signup and view all the answers

Who developed the OSI reference model?

<p>Hubert Zimmermann (D)</p> Signup and view all the answers

How many layers does the OSI model have?

<p>Seven (C)</p> Signup and view all the answers

What was the result of the industry effort to provide multi-vendor interoperability?

<p>Widespread use of TCP/IP (D)</p> Signup and view all the answers

Which networking system influenced the development of the OSI model?

<p>ARPANET (D)</p> Signup and view all the answers

Where are the OSI standards documents available from?

<p>ITU-T and ISO (D)</p> Signup and view all the answers

What does the OSI model focus on?

<p>Software layers of communication (D)</p> Signup and view all the answers

Flashcards

OSI Model (Open Systems Interconnection)

A seven-layered model that standardizes communication protocols, enabling different devices and systems to interact.

ISO (International Organization for Standardization)

The organization responsible for creating and maintaining the OSI model.

Physical Layer (OSI Model)

The physical layer is in charge of converting digital signals into electrical, radio, or optical signals for transmission through a medium.

Data Link Layer (OSI Model)

The data link layer handles error detection and correction, and manages the flow of data between devices on a network.

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Network Layer (OSI Model)

The network layer handles addressing and routing of data packets across networks, ensuring data reaches the correct destination.

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Transport Layer (OSI Model)

The transport layer provides reliable data transmission between two applications, ensuring data arrives in the correct order and without errors.

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Session Layer (OSI Model)

The session layer manages communication sessions between applications, controlling the establishment, maintenance, and termination of connections.

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Presentation Layer (OSI Model)

The presentation layer formats data for presentation to applications, ensuring compatibility and proper interpretation by different systems.

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Application Layer (OSI Model)

The application layer provides services for network applications, enabling users to interact with network resources and services.

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TCP/IP (Transmission Control Protocol/Internet Protocol)

A set of network protocols designed by the U.S. Department of Defense, providing the foundation for the internet.

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U.S. Department of Defense (TCP/IP Development)

The U.S. Department of Defense funded the development of TCP/IP, which evolved from the ARPANET project.

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Layer N Entity

An entity at a given layer that interacts with a corresponding entity at the same layer in another host using a protocol.

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Protocol Data Unit (PDU)

A unit of data exchanged between two entities at layer N, containing information specific to that layer.

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Data Composition at Layer N

The process of taking data from the upper layers and adding header information specific to Layer N, creating a PDU.

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Hubert Zimmermann (OSI Model Developer)

Hubert Zimmermann, a French computer scientist, is credited with developing the OSI reference model.

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Purpose of OSI Model

The OSI model's primary purpose is for teaching and documentation, explaining network protocols and functionality.

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Multi-Vendor Interoperability (TCP/IP)

The widespread adoption of TCP/IP resulted from industry efforts to ensure multi-vendor interoperability, allowing diverse devices to communicate seamlessly.

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ARPANET's Influence on OSI Model

The ARPANET, a precursor to the internet developed by the U.S. Department of Defense, heavily influenced the development of the OSI model.

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OSI Standards Documents

The standards and specifications for the OSI model are available from the International Telecommunication Union (ITU-T) and ISO.

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OSI Model Focus

The OSI model concentrates on the software layers involved in communication, outlining how different software components interact to transmit and receive data across a network.

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Study Notes

  • The OSI reference model, developed by the International Organization for Standardization (ISO), is a widely-used framework for understanding and teaching networking concepts in the field of information technology.
  • The development of the OSI model began in the late 1970s in response to the need for standardizing networking methods.
  • The model was first defined in raw form in 1978 by French software engineer Hubert Zimmermann, and was published as a standard in 1980.
  • The OSI model is a seven-layer model that focuses on the software layers of communication.
  • The model allows for transparent communication between parties through peer-to-peer networking.
  • The OSI model failed to gain widespread use in the design of the Internet, which instead used the less prescriptive Internet Protocol Suite.
  • The OSI model was a major advance in the standardization of network concepts, promoting the idea of a consistent model of protocol layers and interoperability between network devices and software.
  • The model was the result of an industry effort to provide multi-vendor interoperability, but was eventually overshadowed by the widespread use of TCP/IP in the late 1980s and early 1990s.
  • The OSI model had two major components: an abstract model of networking and a set of specific protocols.
  • The OSI standards documents are available from the ITU-T as the X.200 series of recommendations and from ISO.
  • The development of the OSI model was influenced by various networking systems, including the NPL network, ARPANET, CYCLADES, EIN, and the International Networking Working Group (IFIP WG6.1).

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