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2. OSI model - Wikipedia

   en.wikipedia.org/wiki/OSI_model

   The application layer is the layer of the OSI model that is closest to the end user, which means both the OSI application layer and the user interact directly with a software application that implements a component of communication between the client and server, such as File Explorer and Microsoft Word.

3. Application layer - Wikipedia

   en.wikipedia.org/wiki/Application_layer

   An application layer is an abstraction layer that specifies the shared communication protocols and interface methods used by hosts in a communications network. [1] An application layer abstraction is specified in both the Internet Protocol Suite (TCP/IP) and the OSI model. [2]

4. OSI protocols - Wikipedia

   en.wikipedia.org/wiki/OSI_protocols

   OSI model Layer Protocol data unit (PDU) Function [3] Host layers 7 Application: Data: High-level protocols such as for resource sharing or remote file access, e.g. HTTP. 6 Presentation: Translation of data between a networking service and an application; including character encoding, data compression and encryption/decryption: 5 Session

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

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

   This layer, presentation Layer and application layer are combined in TCP/IP model. 9P Distributed file system protocol developed originally as part of Plan 9; ADSP AppleTalk Data Stream Protocol; ASP AppleTalk Session Protocol; H.245 Call Control Protocol for Multimedia Communications; iSNS Internet Storage Name Service

6. Physical layer - Wikipedia

   en.wikipedia.org/wiki/Physical_layer

   In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first and lowest layer: the layer most closely associated with the physical connection between devices. The physical layer provides an electrical, mechanical, and procedural interface to the transmission medium.

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8. Internet protocol suite - Wikipedia

   en.wikipedia.org/wiki/Internet_protocol_suite

   The application layer in the TCP/IP model is often compared to a combination of the fifth (session), sixth (presentation), and seventh (application) layers of the OSI model. Application layer protocols are often associated with particular client–server applications, and common services have well-known port numbers reserved by the Internet ...

9. Node-to-node data transfer - Wikipedia

   en.wikipedia.org/wiki/Node-to-node_data_transfer

   In the OSI model it is handled by the lowest two layers, the data link layer and the physical layer. In most communication systems, the transmitting point applies source coding, [2] followed by channel coding, and lastly, line coding. This produces the baseband signal. The presence of filters may perform pulse shaping.