2024-05-19T21:37:56+03:00[Europe/Moscow] en true How many layers are in the OSI model?, <p>Physical Layer 1</p>, <p>Data Link Layer 2</p>, <p>Network Layer 3</p>, <p>Transport Layer 4</p>, <p>Session Layer 5</p>, <p>Presentation Layer 6</p>, <p>Application Layer 7</p>, <p>OSI</p>, <p>PDU (Protocol Data Unit)</p>, How many layers are in the OSI model?, What does OSI stand for?, What is a PDU?, What layer is responsible for the physical transmission of data?, What device operates at Layer 1?, What layer defines the format of data packets?, What is the PDU at Layer 2 called?, What layer handles logical addressing (MAC addresses)?, What layer is responsible for routing data packets across networks?, What is the PDU at Layer 3 called?, What protocol operates at Layer 3?, What layer establishes, manages, and terminates connections between applications?, What is the PDU at Layer 4 called?, Which protocols operate at Layer 4?, What layer defines the presentation of data (encryption, compression)?, What layer provides services to applications like file transfer and email?, What layer interacts directly with user applications?, Which layer does HTTP operate on?, What is the benefit of using a layered model for networking?, Briefly describe the concept of encapsulation in the OSI model. flashcards
OSI Model

OSI Model

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  • How many layers are in the OSI model?
    7

  • Physical Layer 1

    Handles the physical transmission of data bits over a physical medium (cables, fibers)

  • Data Link Layer 2

    Ensures error-free transmission between network devices using MAC addresses and frames

  • Network Layer 3

    Routes packets across networks based on logical addresses (IP addresses)

  • Transport Layer 4

    Provides reliable data transfer between applications using ports and segments/datagrams

  • Session Layer 5

    Establishes, manages, and terminates sessions between communicating applications

  • Presentation Layer 6

    Takes care of data formatting, encryption, and compression

  • Application Layer 7

    Provides network services to applications (HTTP, FTP, etc.)

  • OSI

    A conceptual framework for network communication divided into 7 layers

  • PDU (Protocol Data Unit)

    The unit of data at each layer of the OSI model

  • How many layers are in the OSI model?
    7
  • What does OSI stand for?
    Open Systems Interconnection
  • What is a PDU?
    Protocol Data Unit (data unit at each layer)
  • What layer is responsible for the physical transmission of data?
    Layer 1 - Physical Layer
  • What device operates at Layer 1?
    Repeater
  • What layer defines the format of data packets?
    Layer 2 - Data Link Layer
  • What is the PDU at Layer 2 called?
    Frame
  • What layer handles logical addressing (MAC addresses)?
    Layer 2 - Data Link Layer
  • What layer is responsible for routing data packets across networks?
    Layer 3 - Network Layer
  • What is the PDU at Layer 3 called?
    Packet
  • What protocol operates at Layer 3?
    IP (Internet Protocol)
  • What layer establishes, manages, and terminates connections between applications?
    Layer 4 - Transport Layer
  • What is the PDU at Layer 4 called?
    Segment (TCP) or Datagram (UDP)
  • Which protocols operate at Layer 4?
    TCP (Transmission Control Protocol) and UDP (User Datagram Protocol)
  • What layer defines the presentation of data (encryption, compression)?
    Layer 5 - Presentation Layer
  • What layer provides services to applications like file transfer and email?
    Layer 6 - Session Layer
  • What layer interacts directly with user applications?
    Layer 7 - Application Layer
  • Which layer does HTTP operate on?
    Layer 7 - Application Layer
  • What is the benefit of using a layered model for networking?
    Promotes modularity, interoperability, and troubleshooting
  • Briefly describe the concept of encapsulation in the OSI model.
    Data is wrapped with header information at each layer as it travels down the stack, and then unwrapped as it travels up the stack at the receiving end.