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PDU in OSI model In telecommunication the term protocol data unit (PDU) has the  following meaning. In a OSI layered model, a unit of data which is specified in a protocol of a given layer and which consists of protocol-control information and possibly user data Of that layer. The PDU for each layer of the OSI model is listed below. Physical layer — raw bits (Is or Os) transmitted physically via the hardware Data Link layer — a frame (or series of bits) Network layer — a packet that contains the source and destination address Transport layer — a segment that includes a TCP header and data Session layer — the data passed to the network connection Presentation layer — the data formatted for presentation Application layer — the data received or transmitted by a software application As you can see, the protocol data unit changes between the seven different layers. The resulting information that is transferred from the application layer to the p...

  Benefits of Networking File sharing             All types of data (Audio, Video, and Images) can be  easily shared  and accessed on network. Resource Sharing            Resources like scanners, printers, network data and         applications can be accessed by remote connection devices,  using  network-connected devices. Example, a application  can be shared by multiple users. Internet Sharing                 A single internet connection can be shared with multiple  users and devices.        Increasing Storage Capacity         Access any types of media files stored remotely on other  computers storage devices (Example NAS) .