PDU - What does Data refer to?

mariocmarioc Member Posts: 9 ■□□□□□□□□□
in CCNA & CCENT
The PDU at the Application, Presentation, and Session layers of the OSI model is referred to as simply "data".

Is "data" defined as user data, headers, or user data & payload?
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  • chmorinchmorin Member Posts: 1,446 ■■■■■□□□□□
    marioc wrote: »
    The PDU at the Application, Presentation, and Session layers of the OSI model is referred to as simply "data".

    Is "data" defined as user data, headers, or user data & payload?

    Generally "Data" in the top 4 (Application, Presentation, Session, and Transport) layers of the OSI suite indicates the information being transfered specific to the user application. So if I was using AIM, the data would be the information the other AIM needs to interpret the message being sent.
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  • thehourmanthehourman Member Posts: 723
    chmorin wrote: »
    Generally "Data" in the top 4 (Application, Presentation, Session, and Transport) layers of the OSI suite indicates the information being transfered specific to the user application. So if I was using AIM, the data would be the information the other AIM needs to interpret the message being sent.
    I thought the data part of top 3 layers from Application, Presentation and Session layers. Transport is segment, Network is packets, Data Link is frames, Physical is bits. As far as I know, once the it reach the Transport layer the 3 upper layers become data.
    I could be wrong, though.
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  • dynamikdynamik Banned Posts: 12,312 ■■■■■■■■■□
    Also, if you 're looking at a specific layer, "data" is considered to be everything that is encapsulated from higher layers.
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  • thinguythinguy Member Posts: 22 ■□□□□□□□□□
    Data, Data, Data, Segment, Packet, Frame, Bit

    3 Datas, then reverse alphabetical order for the last 4
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