The Data Link Layer Utilizes What Name For Its Protocol Data Unit (Pdu)?
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The data link layer utilizes what name for its protocol data unit (PDU)?
The data link layer utilized the frames. There are different types of protocol data units used by the different layers of the OSI model. Let us know the Protocol data unit(PDU) in the OSI model. The PDU’s is data that we call at the specific layer of the OSI model. We have different PCU’s like frames, packets, bits, and then segments.
In the OSI model, the first three i.e application layer, presentation layer, session layer are termed as the senior management team, we call these simply by the name PDU’s. But the below bottom layers have names for each PDU(protocol data unit).
The bottom layers are the physical layer, data link layer, network layer, and then the transport layer. Each of these layers has different PDU’s. It has separate names at each layer of the OSI model. Let us clearly understand the labels for each of these Protocol data units.
The frame is the protocol data unit of layer 2 of the OSI model. And the device that deals with layer 2 to switch is making forwarding decisions based on the layer 2 addresses. The frame is the information that had the layer 2 header. The source and the destination are included inside the header.
At the physical layer, it is where we put the data on the wire. We send the series of the data in the form of 0’s and 1’s binary bits. so we call protocol data units of the physical layer the bits since it sends the data in the form of 0’s and 1’s. At the data link layer, we use the things like ethernet, switches, forwarding data.
Next is the network layer of the OSI model. The network layer is the packet or a datagram. Most of the time we refer to data as packets in any layer of the OSI model randomly. We can use the term packet generally to refer to any data traffic. But especially, the packet is the layer 3 protocol i.e network layer protocol. As we said earlier, we can also use the term datagram to refer to the data at the network layer.
And the last layer that has a name for the separate PDU is the transport layer. At the transport layer, we have segments. The TCP and UDP use the segments. Here we have learned about the different PDUs like bits, frames, packets, or datagrams and then segments.
The data link layer is responsible for the node-to-node delivery of the message. The packet received from the network layer is further divided into different frames depending upon the frame size of the network interface. If the frame buffer is full, then the transmission of the data gets stopped. In the data link layer, we use the device like the switches and bridges. Framing is performed at the data link layer. It adds the physical address of the sender or the receiver at each header of the frame.