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  2. OSI model - Wikipedia

    en.wikipedia.org/wiki/OSI_model

    The link layer corresponds to the OSI data link layer and may include similar functions as the physical layer, as well as some protocols of the OSI's network layer. These comparisons are based on the original seven-layer protocol model as defined in ISO 7498, rather than refinements in the internal organization of the network layer.

  3. Network layer - Wikipedia

    en.wikipedia.org/wiki/Network_layer

    The network layer provides the means of transferring variable-length network packets from a source to a destination host via one or more networks. Within the service layering semantics of the OSI (Open Systems Interconnection) network architecture, the network layer responds to service requests from the transport layer and issues service requests to the data link layer.

  4. List of network protocols (OSI model) - Wikipedia

    en.wikipedia.org/wiki/List_of_network_protocols...

    This article lists protocols, categorized by the nearest layer in the Open Systems Interconnection model.This list is not exclusive to only the OSI protocol family.Many of these protocols are originally based on the Internet Protocol Suite (TCP/IP) and other models and they often do not fit neatly into OSI layers.

  5. OSI protocols - Wikipedia

    en.wikipedia.org/wiki/OSI_protocols

    4 Layer 3: network layer. 5 Layer 4: transport layer. 6 Layer 5: ... While the seven-layer OSI model is often used as a reference for teaching and documentation, [2] ...

  6. Data link layer - Wikipedia

    en.wikipedia.org/wiki/Data_link_layer

    The data link layer, or layer 2, is the second layer of the seven-layer OSI model of computer networking. This layer is the protocol layer that transfers data between nodes on a network segment across the physical layer . [ 2 ]

  7. Layer 8 - Wikipedia

    en.wikipedia.org/wiki/Layer_8

    An 8th layer has also been referenced to physical (real-world) controllers containing an external hardware device which interacts with an OSI model network. An example of this is ALI in Profibus. A network guru T-shirt from the 1980s shows Layer 8 as the "financial" layer, and Layer 9 as the "political" layer. [7] The design was credited to Evi ...

  8. Protocol data unit - Wikipedia

    en.wikipedia.org/wiki/Protocol_data_unit

    The Layer 3: network layer PDU is the packet. The Layer 2: data link layer PDU is the frame. The Layer 1: physical layer PDU is the bit or, more generally, symbol. Given a context pertaining to a specific OSI layer, PDU is sometimes used as a synonym for its representation at that layer.

  9. Network packet - Wikipedia

    en.wikipedia.org/wiki/Network_packet

    In the seven-layer OSI model of computer networking, packet strictly refers to a protocol data unit at layer 3, the network layer. [2] A data unit at layer 2, the data link layer, is a frame. In layer 4, the transport layer, the data units are segments and datagrams.