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Can data frames be encapsulated in the network layer? Many novices are not very clear about this. In order to help you solve this problem, the following editor will explain it in detail. People with this need can come and learn. I hope you can gain something.

The encapsulation of data frames is not implemented in the network layer, but in the data link layer. The data link layer lies between the physical layer and the network layer. The data link layer provides services to the network layer on the basis of the services provided by the physical layer, and its most basic service is to reliably transmit the data from the network layer to the target network layer of the neighboring nodes.

The encapsulation of data frames is not implemented in the network layer, but in the data link layer.

The data link layer is the second layer of the OSI reference model, which lies between the physical layer and the network layer. The data link layer provides services to the network layer on the basis of the services provided by the physical layer, and its most basic service is to reliably transmit the data from the network layer to the target network layer of the neighboring nodes.

The data link layer 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. The data link layer must have a series of corresponding functions, including: how to combine the data into data blocks, which are called frames in the data link layer, and the frame is the transmission unit of the data link layer; how to control the transmission of frames on the physical channel, including how to handle transmission errors, and how to adjust the transmission rate to match the receiver And providing management of the establishment, maintenance and release of data link paths between the two network entities.

Physical link (physical line): consists of transmission media and equipment. The original physical transmission line refers to the basic physical transmission media and equipment without high-level error control.

Data link (logical line): on a physical line, the transmission of these data is controlled by some procedures or protocols to ensure the correctness of the transmitted data. The hardware and software that implement these protocols or protocols are added to the physical circuit, thus forming the data link, the transmission path from the data sending point to the data receiving point. When multiplexing technology is used, there can be multiple data links on a physical link.

The network layer is located in the second layer of the three-layer structure of the Internet of things, and its function is "transmission", that is, information transmission through the communication network.

As a link between the perceptual layer and the application layer, the network layer is composed of a variety of private networks, Internet, wired and wireless communication networks, which is equivalent to the human neural central system, and is responsible for the information obtained by the perceptual layer. safely and reliably transmitted to the application layer, and then processed according to different application needs.

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