What is OSI Model?

00:08:22
https://www.youtube.com/watch?v=Ilk7UXzV_Qc

Resumo

TLDRThe video explains the OSI (Open Systems Interconnection) model, a conceptual framework for understanding how applications communicate over a network. The OSI model consists of seven layers: Application, Presentation, Session, Transport, Network, Data Link, and Physical. Each layer serves a unique role in the communication process, from user interactions at the Application layer to the physical transmission of data at the Physical layer. The model helps developers and vendors create compatible communication products by establishing standardized protocols and ensuring seamless data transmission across different network systems.

Conclusões

  • 🔍 OSI stands for Open Systems Interconnection.
  • 🗂️ The OSI model has seven layers: Application, Presentation, Session, Transport, Network, Data Link, Physical.
  • 👩‍💻 The Application layer provides services users interact with, like web browsers.
  • 🔄 The Presentation layer translates data formats for network transmission.
  • 🔗 The Session layer manages connections and data exchange sessions.
  • 🚚 The Transport layer coordinates data transmission across networks.
  • 📤 The Network layer routes data to its final destination.
  • 📦 The Data Link layer checks errors and organizes data into frames.
  • ⚡ The Physical layer encompasses the physical devices and media used for data transmission.
  • 🛠️ Understanding the OSI model aids in troubleshooting network issues.

Linha do tempo

  • 00:00:00 - 00:08:22

    The OSI model, which stands for Open Systems Interconnection, is a framework that outlines how applications communicate over a network. It consists of seven layers: Application, Presentation, Session, Transport, Network, Data Link, and Physical, each playing a crucial role in data transmission over various mediums like Ethernet and Wi-Fi. The video summarizes each layer starting from the top, emphasizing the Application layer as the one most users interact with, providing services using protocols such as HTTP. The Presentation layer is responsible for syntax processing, converting data formats, while the Session layer manages connections between devices including authentication. The Transport layer ensures data is transmitted reliably across network connections, utilizing protocols like TCP and UDP. The Network layer handles data routing and address mapping, then passes data to the Data Link layer, which packages bits into data frames and checks for errors. Finally, the Physical layer transmits digital data over the network medium. Understanding the OSI model helps in recognizing compatible communication devices and protocols.

Mapa mental

Vídeo de perguntas e respostas

  • What does OSI stand for?

    OSI stands for Open Systems Interconnection.

  • What are the seven layers of the OSI model?

    The seven layers are Application, Presentation, Session, Transport, Network, Data Link, and Physical.

  • What is the function of the Application layer?

    The Application layer provides network services to the end-user and is the layer most users interact with.

  • What is the responsibility of the Transport layer?

    The Transport layer is responsible for the transmission of data across network connections.

  • What does the Data Link layer manage?

    The Data Link layer manages physical addressing methods and checks for transmission errors.

  • What is the focus of the Physical layer?

    The Physical layer deals with the electrical or physical aspects of data transmission and connections.

  • Why is the OSI model important?

    The OSI model serves as a guide for developing communication products and ensures compatibility between different protocols and devices.

  • How can the OSI model help with troubleshooting?

    Understanding the OSI model allows you to identify which layer to troubleshoot if issues arise in network communication.

  • What protocols operate at the Transport layer?

    The Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) are commonly mentioned protocols at the Transport layer.

  • What is the role of the Network layer?

    The Network layer handles the routing of data to its correct destination.

Ver mais resumos de vídeos

Obtenha acesso instantâneo a resumos gratuitos de vídeos do YouTube com tecnologia de IA!
Legendas
en
Rolagem automática:
  • 00:00:02
    OSI stands for open systems
  • 00:00:05
    interconnection and is a conceptual
  • 00:00:08
    framework for how applications
  • 00:00:09
    communicate over a network there are
  • 00:00:12
    seven layers within the model in the
  • 00:00:15
    layers depiction is used to help users
  • 00:00:17
    identify what is happening within a
  • 00:00:19
    networking system
  • 00:00:24
    [Music]
  • 00:00:34
    before we get started on today's video
  • 00:00:37
    if you love our videos be sure to click
  • 00:00:40
    the like button below then make sure to
  • 00:00:43
    click Subscribe and the little bell to
  • 00:00:46
    receive notifications of new real Parrs
  • 00:00:48
    videos this way you never miss another
  • 00:00:51
    one
  • 00:00:54
    the OSI model layers are typically
  • 00:00:56
    described from the top layer down the
  • 00:00:59
    layers are described as application
  • 00:01:02
    presentation session transport network
  • 00:01:07
    data link and physical
  • 00:01:11
    these layers are provided by a mixture
  • 00:01:13
    of network car drivers operating systems
  • 00:01:16
    applications and networking hardware
  • 00:01:19
    that facilitate the transmission of
  • 00:01:21
    signals over Ethernet fiber-optic Wi-Fi
  • 00:01:24
    or other wireless protocols
  • 00:01:28
    will describe the layers from the top
  • 00:01:31
    down as the top layer is the application
  • 00:01:34
    layer or layer 7 this is the layer that
  • 00:01:38
    most users interact with and will
  • 00:01:40
    recognize the application layer provides
  • 00:01:43
    network services to the end-user these
  • 00:01:47
    services are protocols that work with
  • 00:01:49
    the data the client is using one of
  • 00:01:52
    these protocols may be HTTP that is used
  • 00:01:56
    with web browsers such as Google Chrome
  • 00:01:58
    Firefox and Internet Explorer other
  • 00:02:02
    examples of applications that use this
  • 00:02:04
    layer are Office Outlook and Skype
  • 00:02:09
    all of those interactive applications
  • 00:02:11
    provide a set of services that allow the
  • 00:02:14
    application layer to supply data to and
  • 00:02:17
    receive data from the presentation layer
  • 00:02:23
    the presentation layer or layer six
  • 00:02:26
    performs the uncomplicated task of
  • 00:02:28
    syntax processing or converting data
  • 00:02:31
    from one format to another for example
  • 00:02:35
    consider you're ordering something from
  • 00:02:37
    an online store these transactions are
  • 00:02:40
    typically handled in a secure
  • 00:02:42
    transmission which means that the data
  • 00:02:44
    passing between the store or the website
  • 00:02:47
    application will transmit encrypted data
  • 00:02:50
    to the presentation layer that will need
  • 00:02:52
    to be decrypted and processed this layer
  • 00:02:56
    handles translating the data from the
  • 00:02:59
    top layer which is presented in
  • 00:03:01
    application format to network format and
  • 00:03:04
    vice versa
  • 00:03:07
    after the presentation layer processes
  • 00:03:10
    the data from one format to another the
  • 00:03:13
    information is then passed to the
  • 00:03:14
    session layer or the application layer
  • 00:03:17
    depending on whether the data is
  • 00:03:19
    transmitting or receiving
  • 00:03:24
    at the session layer or layer five the
  • 00:03:27
    construction direction and conclusion of
  • 00:03:30
    connections between devices occur this
  • 00:03:34
    layer supports multiple types of
  • 00:03:36
    connections as well as being responsible
  • 00:03:38
    for authentication and reconnection if a
  • 00:03:41
    network interruption should occur after
  • 00:03:44
    the session is established the data then
  • 00:03:47
    passes to or from the transport layer
  • 00:03:52
    the transport layer or layer 4 is
  • 00:03:55
    responsible for the transmission of data
  • 00:03:57
    across network connections this layer
  • 00:04:01
    coordinates how much data to send how
  • 00:04:03
    fast where it goes and these sorts of
  • 00:04:06
    things
  • 00:04:08
    of the most widely known protocols for
  • 00:04:11
    internet applications these services may
  • 00:04:14
    be provided by transmission control
  • 00:04:16
    protocol or TCP and user Datagram
  • 00:04:19
    protocol or UDP other protocols may
  • 00:04:23
    provide additional capabilities
  • 00:04:25
    including error recovery data flow and
  • 00:04:29
    retransmission once the transport layer
  • 00:04:32
    has completed its function the data is
  • 00:04:35
    then passed to or from the network layer
  • 00:04:40
    the network layer or layer three handles
  • 00:04:44
    the routing of the data after the data
  • 00:04:47
    arrives at this layer each frame of data
  • 00:04:49
    is examined to conclude if the data has
  • 00:04:52
    reached its ultimate target the layer
  • 00:04:55
    sends data to the correct destination on
  • 00:04:57
    outgoing transmissions and receives
  • 00:05:00
    incoming transmissions as well the IP
  • 00:05:03
    portion of tcp/ip is the commonly known
  • 00:05:07
    network layer for the Internet
  • 00:05:10
    this layer also manages the mapping
  • 00:05:12
    between logical addresses and physical
  • 00:05:15
    addresses for IP addresses this is
  • 00:05:18
    accomplished through address resolution
  • 00:05:20
    protocol or ARP the data is then passed
  • 00:05:25
    to the next required layer which is the
  • 00:05:27
    data link layer
  • 00:05:30
    the datalink layer or layer two is
  • 00:05:33
    considered the most complex of the
  • 00:05:35
    layers this layer is often divided into
  • 00:05:39
    sub layers called media access control
  • 00:05:41
    or mac and logical link control or LLC
  • 00:05:46
    the layer sets up links across the
  • 00:05:49
    physical network when this layer
  • 00:05:51
    receives data from the physical layer it
  • 00:05:53
    checks for transmission errors and then
  • 00:05:56
    packages the bits into data frames from
  • 00:06:00
    there this layer manages the physical
  • 00:06:02
    addressing methods for the mac or LLC
  • 00:06:05
    layers an example of the mac layer
  • 00:06:08
    includes 802.11 Wireless specifications
  • 00:06:12
    as well as Ethernet
  • 00:06:15
    at the data link layer the data passes
  • 00:06:18
    to or from the final layer in the OSI
  • 00:06:21
    model which is the physical layer
  • 00:06:26
    the physical layer or layer one is the
  • 00:06:29
    electrical or physical layer of the
  • 00:06:31
    model this layer encompasses the network
  • 00:06:34
    cables power plugs cable pinouts
  • 00:06:37
    wireless radio frequencies connectors
  • 00:06:40
    transceivers receivers repeaters pulses
  • 00:06:44
    of light electric voltages etc
  • 00:06:49
    when troubleshooting problems this is
  • 00:06:51
    typically the first place to start is
  • 00:06:54
    the device plugged in is the wireless
  • 00:06:57
    card working
  • 00:07:00
    at this layer the model transmits the
  • 00:07:03
    digital data bits from the source or
  • 00:07:05
    sending devices physical layer over
  • 00:07:08
    network communications media which can
  • 00:07:10
    be electrical mechanical or radio to the
  • 00:07:14
    receiving or destination devices
  • 00:07:16
    physical layer
  • 00:07:19
    the OSI model is a guide for developers
  • 00:07:22
    and vendors to smooth the progress of
  • 00:07:24
    developing communication products and
  • 00:07:26
    software programs that will work in
  • 00:07:28
    cooperation with a commonly established
  • 00:07:31
    model once you understand the model you
  • 00:07:34
    can then understand which protocols and
  • 00:07:36
    devices will be compatible with one
  • 00:07:39
    another
  • 00:07:44
    want to learn
  • 00:07:46
    see programming in an easy-to-understand
  • 00:07:49
    format and take your career to the next
  • 00:07:51
    level head on over to real parse com
  • 00:07:56
    [Music]
Etiquetas
  • OSI
  • network communication
  • Application layer
  • Presentation layer
  • Transport layer
  • Network layer
  • Data Link layer
  • Physical layer
  • protocols
  • troubleshooting