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This layer is the protocol layer that transfers data between nodes on a network segment across the physical layer. [2] The data link layer provides the functional and procedural means to transfer data between network entities and may also provide the means to detect and possibly correct errors that can occur in the physical layer. The data link ...
The data to be transmitted is composed at the topmost layer of the transmitting device (layer N) into a protocol data unit (PDU). The PDU is passed to layer N−1, where it is known as the service data unit (SDU). At layer N−1 the SDU is concatenated with a header, a footer, or both, producing a layer N−1 PDU. It is then passed to layer N−2.
In the seven-layer OSI model of computer networking, the presentation layer is layer 6 and serves as the data translator for the network. [ 2 ] [ 3 ] [ 4 ] It is sometimes called the syntax layer. [ 5 ]
Lightweight Presentation Protocol (LPP) [2] NetWare Core Protocol (NCP) Network Data Representation (NDR) [2] Tox, The Tox protocol is sometimes regarded as part of both the presentation and application layer; eXternal Data Representation (XDR) [2] X.25 Packet Assembler/Disassembler Protocol (PAD)
Multilayer switch: a switch that, in addition to switching on OSI layer 2, provides functionality at higher protocol layers. Protocol converter: a hardware device that converts between two different types of transmission, for interoperation. [16] Bridge router (brouter): a device that works as a bridge and as a router. The brouter routes ...
The Layer 4: transport layer PDU is the segment. The Layer 3: network layer PDU is the packet or the datagram. [2] 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 ...
The services and protocols specified in IEEE 802 map to the lower two layers (data link and physical) of the seven-layer Open Systems Interconnection (OSI) networking reference model. IEEE 802 divides the OSI data link layer into two sub-layers: logical link control (LLC) and medium access control (MAC), as follows: Data link layer. LLC sublayer
Many switches also perform operations at other layers. A device capable of more than bridging is known as a multilayer switch. A layer 2 network device is a multiport device that uses hardware addresses (MAC addresses) to process and forward data at the data link layer (layer 2). A switch operating as a network bridge may interconnect otherwise ...