CH2 SV_OSE_Part2mix

Chapter 2, Part 2

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CH2 SV_OSE_Part2mix

By S V
Created 3 years ago

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Chapter 2, Part 2
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Slide Content
  1. Network Layer of OSI Model

    Slide 1 - Network Layer of OSI Model

    • Responsible for moving packets (data) from one end of the network to the other, called end-to-end communications
    • Requires logical addresses such as IP addresses
    • Device example: Router
    • Routing is the ability of various network devices and their related software to move data packets from source to destination
  2. Transport Layer of OSI Model

    Slide 2 - Transport Layer of OSI Model

    • Takes data from higher levels of OSI Model and breaks it into segments that can be sent to lower-level layers for data transmission
    • Conversely, reassembles data segments into data that higher-level protocols and applications can use
    • Also puts segments in correct order (called sequencing ) so they can be reassembled in correct order at destination
  3. Transport Layer of OSI Model (Continued)

    Slide 3 - Transport Layer of OSI Model (Continued)

    • Concerned with the reliability of the transport of sent data
    • May use a connection-oriented protocol such as TCP to ensure destination received segments
    • May use a connectionless protocol such as UDP to send segments without assurance of delivery
    • Uses port addressing
  4. Session Layer of OSI Model

    Slide 4 - Session Layer of OSI Model

    • Responsible for managing the dialog between networked devices
    • Establishes, manages, and terminates connections
    • Provides duplex, half-duplex, or simplex communications between devices
    • Provides procedures for establishing checkpoints, adjournment, termination, and restart or recovery procedures
    • fiberbit.com.tw
  5. Presentation Layer of OSI Model

    Slide 5 - Presentation Layer of OSI Model

    • Concerned with how data is presented to the network
    • Handles three primary tasks:
    • Translation
    • Compression
    • Encryption
  6. Presentation Layer of OSI Model (Continued)

    Slide 6 - Presentation Layer of OSI Model (Continued)

    • Translation
    • Changes data so another type of computer can understand it
    • Compression
    • Makes data smaller to send more data in same amount of time
    • Encryption
    • Encodes data to protect from interception or eavesdropping
  7. Application Layer of OSI Model

    Slide 7 - Application Layer of OSI Model

    • Contains all services or protocols needed by application software or operating system to communicate on the network
    • Examples
    • Firefox web browser uses HTTP (Hyper-Text Transport Protocol)
    • E-mail program may use POP3 (Post Office Protocol version 3) to read e-mails and SMTP (Simple Mail Transport Protocol) to send e-mails
  8. How Data Moves Through the OSI Model

    Slide 8 - How Data Moves Through the OSI Model

  9. How Data Moves Through the OSI Model (Continued)

    Slide 9 - How Data Moves Through the OSI Model (Continued)

    • Each layer of OSI Model except Physical adds its own header to the data that originated from the operating system
    • Adds own header in front of the header from the previous layer
    • Header contains information that describes what each layer of the OSI Model should do with the data
  10. Data as It Appears to the System Moving Down the OSI Layers

    Slide 10 - Data as It Appears to the System Moving Down the OSI Layers

    • Data Link layer also adds a trailer
    • Trailer contains additional information that deals with error correction
  11. Data as It Moves Through OSI Layers, Sent by One Computer and Received by Another

    Slide 11 - Data as It Moves Through OSI Layers, Sent by One Computer and Received by Another

  12. TCP/IP Model

    Slide 12 - TCP/IP Model

    • Built around the TCP/IP protocol suite
    • A protocol suite is a largenumber of relatedprotocols that worktogether to allownetworkedcomputers tocommunicate