OSI Model
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Questions and Answers

What is the primary purpose of using a reference model in networking?

  • To categorize every single protocol and device into one layer
  • To understand how devices interact with each other (correct)
  • To develop a new protocol for data transmission
  • To create a new network architecture
  • What is the Open Systems Interconnect model commonly known as?

  • Network reference model
  • OSI model (correct)
  • TCP/IP model
  • ISO model
  • What is the primary concern of the physical layer in the OSI model?

  • Segmenting data
  • Routing data packets
  • Getting bits on the wire (correct)
  • Encrypting data
  • What is an example of something you might see at layer one of the OSI model?

    <p>Fiber optic cable</p> Signup and view all the answers

    What is the name given to data at different layers of the OSI model?

    <p>Not specified in the video</p> Signup and view all the answers

    Why is the OSI model not revered as the end-all, be-all of networking?

    <p>It is not a perfect model</p> Signup and view all the answers

    What is represented by light in the fiber optic cable example?

    <p>Binary zeros and ones</p> Signup and view all the answers

    What is the number of layers in the OSI model?

    <p>Seven</p> Signup and view all the answers

    What is the primary function of the session layer?

    <p>Session establishment, maintenance, and termination</p> Signup and view all the answers

    What is the purpose of the presentation layer?

    <p>To format data into a readable format</p> Signup and view all the answers

    What protocol is used to set up and maintain voice or video calls?

    <p>SIP</p> Signup and view all the answers

    What is the purpose of the application layer?

    <p>To provide network services and functionality</p> Signup and view all the answers

    What is the protocol used to access a secure website?

    <p>HTTPS</p> Signup and view all the answers

    What is the TCP port number used by HTTPS?

    <p>443</p> Signup and view all the answers

    What is the term used to refer to data at different layers of the OSI model?

    <p>Protocol Data Unit (PDU)</p> Signup and view all the answers

    What is the correct order of the OSI layers from bottom to top?

    <p>Physical, Datalink, Network, Transport, Session, Presentation, Application</p> Signup and view all the answers

    What type of addresses are used to make forwarding decisions at the data link layer?

    <p>Physical MAC Addresses</p> Signup and view all the answers

    What is the memory aid used to remember the OSI layers from top to bottom?

    <p>All People Seem To Need Data Processing</p> Signup and view all the answers

    What is the primary function of the transport layer?

    <p>Data segmentation and reassembly</p> Signup and view all the answers

    What is the term used to refer to data at the network layer?

    <p>Packets or Datagrams</p> Signup and view all the answers

    What type of connections are used in the transport layer?

    <p>Both Connection-oriented and Connectionless</p> Signup and view all the answers

    What is the purpose of the memory aid 'Please Do Not Throw Sausage Pizza Away'?

    <p>To remember the OSI layers from bottom to top</p> Signup and view all the answers

    What is the protocol used for reliable connections at the transport layer?

    <p>TCP (Transmission Control Protocol)</p> Signup and view all the answers

    What is the term used to refer to data at the physical layer?

    <p>Bits</p> Signup and view all the answers

    What is the device that lives at the data link layer and makes forwarding decisions based on MAC addresses?

    <p>Ethernet Switch</p> Signup and view all the answers

    What is the term used to refer to data at the transport layer?

    <p>Segments</p> Signup and view all the answers

    What is the protocol used for unreliable connections at the transport layer?

    <p>UDP (User Datagram Protocol)</p> Signup and view all the answers

    What is the memory aid used to remember the protocol data units (PDUs) for the first four layers of the OSI model?

    <p>Bacon Frying Produces Salivation</p> Signup and view all the answers

    Study Notes

    OSI Model Overview

    • The OSI model is a reference model that helps understand how devices and protocols interact with each other in a network.
    • It has seven layers, each with specific jobs, but it's not a strict categorization model.

    Physical Layer (Layer 1)

    • Concerned with getting bits on the wire (ones and zeros).
    • Uses physical media like cabling (e.g., fiber optic cables) to transmit data.
    • Data is referred to as bits at this layer.
    • Makes decisions based on MAC addresses in an Ethernet network.
    • Examples of devices that live at this layer are Ethernet switches.
    • Data is referred to as frames at this layer.

    Network Layer (Layer 3)

    • Concerned with logical IP addresses and making forwarding decisions.
    • Routers are typical devices that live at this layer.
    • Data is referred to as packets or datagrams at this layer.

    Transport Layer (Layer 4)

    • Concerned with network connections and reliable/unreliable data transfer.
    • Examples of protocols that live at this layer are TCP (connection-oriented) and UDP (connectionless).
    • Data is referred to as segments at this layer.

    Session Layer (Layer 5)

    • Concerned with setting up, maintaining, and tearing down sessions.
    • Examples of protocols that live at this layer are SIP (Session Initiation Protocol).

    Presentation Layer (Layer 6)

    • Concerned with data formatting and presentation (e.g., JPEG, PNG, ASCII).

    Application Layer (Layer 7)

    • Concerned with network functionality and applications (e.g., HTTP, HTTPS).
    • Examples of devices that live at this layer are web browsers and servers.

    OSI Model Mnemonics

    • To remember the OSI model layers from bottom up: Please Do Not Throw Sausage Pizza Away Again.
    • To remember the OSI model layers from top down: All People Seem To Need Data Processing Again.

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    Description

    Learn how to analyze network components and their interactions using a reference model. This quiz helps IT professionals understand how devices and protocols work together.

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