What is the log data unit?
The log data unit (PDU) is a layered data delivery system that communicates either with a network device or with protocols in the same machine. There are five named layers of data units of the protocol, but the fifth layer and higher are classified as the same thing, so there may be much more than five layers. The only physical layer used to communicate with hardware is the first layer that transports information in binary, bit after bit. When the data is transmitted, they start on the highest layer and flow down, each layer adding the head of the layer. The second layer adds footer and converts data to bits for the first layer and the information is sent. The protocol data unit is used as a packet to create and deliver this data between two protocols or processes. There can be many layers of data packets; The more layers, the further the data from the physical level.
Although there may be a large amount of VRSTEV transporting information, there are only five different layers. The first layer of the protocol data unit is a layer 1 and is known as a physical level. Layer 2 is a layer of data connection that connects data, and layer 3 is a network layer that communicates between the network. The fourth layer is known as a transport layer because it is where the data is ready to be sent. Layers 5 and higher are called data together and are high in the computer hierarchy.
When the information is sent, it goes in descending order, starting with the top layer. For example, if the data needed a layer 6, then the packet will start here. Each layer below it then adds a header package that adds more data. In a layer of 2 layer adds headers and footers, which makes the packet suitable for transport.
Layer 1 is a specialty unit layer compared to another protocol, because it does not use either the header or the footer or in fact creates data packets. This layer transmits information about bits, in binary, protocol, processor hardware requiring date. If the packet needs a 2 or higher layer, the layer 2 is responsible for the conversion of all headers, footers and packet itself to bits so it can be delivered by a layer 1.