What are the data units transmitted at the network layer, the data link layer and the physical layer, respectively?
This article will explain in detail the data units transmitted in the network layer, the data link layer and the physical layer. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.
The data units transmitted by the network layer, the data link layer and the physical layer are messages, frames and bits, respectively. The network layer defines the logical address that can identify all nodes, as well as the way of routing implementation and learning.
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The data units transmitted by the network layer, the data link layer and the physical layer are messages, frames and bits, respectively.
Let's briefly introduce the network layer, data link layer and physical layer:
Network layer
This layer defines end-to-end packet transmission, which defines logical addresses that can identify all nodes, as well as how routing is implemented and how to learn. In order to adapt to the transmission medium where the maximum transmission unit length is less than the packet length, the network layer also defines a segmentation method of how to decompose a packet into smaller packets. Example: IP,IPX and so on.
Data link layer
It defines how data is transmitted on a single link. These protocols are related to the various media under discussion. Example: ATM,FDDI and so on.
Physical layer
OSI's physical layer specifications are about the characteristics of transport media, and these specifications usually refer to standards developed by other organizations. Connectors, frames, the use of frames, current, coding and optical modulation all belong to various physical layer specifications. Multiple specifications are commonly used in the physical layer to define all the details. Example: Rj45802.3 and so on.
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