Is the repeater a traditional device?

What does not belong to the network interconnection equipment is the repeater.

Among switches, bridges, routers and repeaters, only repeaters belong to the physical layer in the OSI model, and the devices in the physical layer do not directly participate in the transmission of network data.

Repeater works in the physical layer of OSI architecture. It receives and recognizes network signals, and then regenerates the signals and sends them to other branches of the network. The main function of the repeater is to regenerate the received signal and send it out, which only plays the role of extending the transmission distance and is transparent to the high-level protocol.

Switches belong to network layer and data link layer. Bridge belongs to the data link layer, and forwarding information between networks according to the physical address of frames can alleviate the busy degree of network communication and improve efficiency. Routers are located in the network layer, and can forward information between networks through logical addresses, so that interconnection can be completed before heterogeneous networks.

Extended data:

The principle of data transmission by network interconnection equipment;

Data is transmitted in the form of "packets" in the network, but the format of "packets" in different networks is also different. If data is transmitted between different networks, because the packet format is different, the data cannot be transmitted, so the inter-network connection equipment plays the role of "translator" and converts the "packet" in one network into the "packet" in another network.

The transformation of data packets between networks is closely related to the seven-layer model of OSI. If the difference between the two networks is small, fewer layers need to be converted. For example, Ethernet and Ethernet interconnection, because they belong to a kind of network, data packets only need to be converted to the second layer of OSI (data link layer), and the functions of the required inter-network connection devices are also very simple (such as bridges).

If Ethernet is connected to token ring network, data information needs to be converted to the third layer (network layer) of OSI, and the required intermediate equipment is also complicated (such as routers); If two completely different networks, TCP/IP and SNA, are connected, their data packets need seven-layer conversion, and the required connection equipment is also the most complicated (such as gateway).

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